iOS - 跑马灯、弹幕

2016-08-11 672

1、跑马灯

具体实现代码见 GitHub 源码 QExtension

QMarqueeView.h

    #pragma mark - QMarqueeViewDelegate

    /// 跑马灯内容点击处理协议
    @protocol QMarqueeViewDelegate <NSObject>

    - (void)didClickContentAtIndex:(NSInteger)index;

    @end


    #pragma mark - QMarqueeView

    /// 跑马灯滚动方向枚举
    typedef NS_ENUM(NSUInteger, QMarqueeViewDirection) {
        QMarqueeViewDirectionUp,
        QMarqueeViewDirectionDown,
        QMarqueeViewDirectionLeft,
        QMarqueeViewDirectionRight
    };

    @interface QMarqueeView : UIView

    /// 显示的文本内容
    @property (nonatomic, strong) NSArray *contentTexts;

    /// 显示的文本内容颜色，default is redColor
    @property (nonatomic, strong) UIColor *contentTextColor;

    /// 显示的文本内容字体，default is 15.0
    @property (nonatomic, strong) UIFont *contentTextFont;

    /// 显示的文本内容对齐方式，default is NSTextAlignmentLeft
    @property (nonatomic, assign) NSTextAlignment contentTextAlign;

    /// 显示的图标内容，可以为 nil 不显示图标
    @property (nonatomic, strong) UIImage *contentIcon;

    /// 动画方向，default is QMarqueeViewDirectionUp
    @property (nonatomic, assign) QMarqueeViewDirection animationDirection;

    /// 动画时间，等于 0 时不滚动
    @property (nonatomic, assign) NSTimeInterval animationDuration;

    /// 动画停顿时间，default is 1.0 秒
    @property (nonatomic, assign) NSTimeInterval animationDelay;

    /// 代理
    @property (nonatomic, weak) id<QMarqueeViewDelegate> delegate;

    /**
     *  开始动画
     */
    - (void)q_startAnimation;

    /**
     *  创建跑马灯视图控件，开始滚动
     *
     *  @param frame        跑马灯对象的 frame
     *  @param texts        显示的文本内容
     *  @param color        显示的文本内容颜色，default is redColor
     *  @param font         显示的文本内容字体，default is 15.0
     *  @param align        显示的文本内容对齐方式，default is NSTextAlignmentLeft
     *  @param icon         显示的图片内容
     *  @param direction    动画方向，default is QMarqueeViewDirectionUp
     *  @param duration     动画时间，等于 0 时不滚动
     *  @param delay        动画停顿时间，default is 1.0 秒
     *  @param target       代理
     *
     *  @return 跑马灯视图控件
     */
    + (instancetype)q_marqueeViewWithFrame:(CGRect)frame
                                     texts:(NSArray *)texts
                                     color:(nullable UIColor *)color
                                      font:(nullable UIFont *)font
                                     align:(NSTextAlignment)align
                                      icon:(nullable UIImage *)icon
                                 direction:(QMarqueeViewDirection)direction
                                  duration:(NSTimeInterval)duartion
                                     delay:(NSTimeInterval)delay
                                    target:(nullable id<QMarqueeViewDelegate>)target;

    @end

QMarqueeView.m

    #define SELF_WIDTH      self.frame.size.width
    #define SELF_HEIGHT     self.frame.size.height

    @interface QMarqueeView ()

    /// 两个 label 循环滚动
    @property (nonatomic, strong) UILabel *firstContentLabel;
    @property (nonatomic, strong) UILabel *secondContentLabel;

    /// 显示图片的视图
    @property (nonatomic, strong) UIImageView *imageView;

    /// 当前显示的行
    @property (nonatomic, assign) NSInteger currentIndex;

    /// 文本内容的起始位置、宽度、高度
    @property (nonatomic, assign) CGFloat contentX;
    @property (nonatomic, assign) CGFloat contentWidth;
    @property (nonatomic, assign) CGFloat contentHeight;

    @end

    @implementation QMarqueeView

    /// 创建跑马灯视图控件，开始滚动
    + (instancetype)q_marqueeViewWithFrame:(CGRect)frame
                                     texts:(NSArray *)texts
                                     color:(nullable UIColor *)color
                                      font:(nullable UIFont *)font
                                     align:(NSTextAlignment)align
                                      icon:(nullable UIImage *)icon
                                 direction:(QMarqueeViewDirection)direction
                                  duration:(NSTimeInterval)duartion
                                     delay:(NSTimeInterval)delay
                                    target:(nullable id<QMarqueeViewDelegate>)target {

        QMarqueeView *marqueeView = [[self alloc] initWithFrame:frame];

        marqueeView.contentTexts = texts;
        marqueeView.contentTextColor = color;
        marqueeView.contentTextFont = font;
        marqueeView.contentTextAlign = align;
        marqueeView.contentIcon = icon;
        marqueeView.animationDirection = direction;
        marqueeView.animationDuration = duartion;
        marqueeView.animationDelay = delay;
        marqueeView.delegate = target;

        [marqueeView q_startAnimation];

        return marqueeView;
    }

    /// 创建视图控件
    - (void)setupView {

        // 父视图裁剪
        self.clipsToBounds = YES;

        // 控件之间的间隔值
        CGFloat margin = 10;

        // 判断是否有图标
        if (self.contentIcon) {

            // 添加 Icon 视图
            CGRect iconBackFrame = CGRectMake(0, 0, margin + SELF_HEIGHT, SELF_HEIGHT);
            UIView *iconBackView = [[UIView alloc] initWithFrame:iconBackFrame];
            iconBackView.backgroundColor = [UIColor clearColor];
            [self addSubview:iconBackView];

            CGRect iconFrame = CGRectMake(margin, 0, SELF_HEIGHT, SELF_HEIGHT);
            self.imageView = [[UIImageView alloc] initWithFrame:iconFrame];
            self.imageView.backgroundColor = [UIColor clearColor];
            self.imageView.image = self.contentIcon;
            [iconBackView addSubview:self.imageView];

            // 计算 Texts 的 frame 值
            self.contentX = margin + SELF_HEIGHT;
            self.contentWidth = SELF_WIDTH - self.contentX - margin;

        } else {

            // 计算 Texts 的 frame 值
            self.contentX = margin;
            self.contentWidth = SELF_WIDTH - self.contentX - margin;
        }
        self.contentHeight = SELF_HEIGHT;

        // 创建第一个 label
        CGRect frame1 = CGRectMake(0, 0, self.contentWidth, self.contentHeight);
        self.firstContentLabel = [[UILabel alloc] initWithFrame:frame1];
        [self setLabel:self.firstContentLabel];

        // 创建第二个 label
        if (self.animationDirection <= 1) {

            CGRect frame2 = CGRectMake(0, SELF_HEIGHT, self.contentWidth, self.contentHeight);
            self.secondContentLabel = [[UILabel alloc] initWithFrame:frame2];
            [self setLabel:self.secondContentLabel];
        }
    }

    /// 设置 label 属性
    - (void)setLabel:(UILabel *)label {

        // 设置 label 背景视图
        CGRect frame;
        if (self.contentIcon == nil && self.animationDirection > 1) {
            frame = CGRectMake(0, 0, SELF_WIDTH, self.contentHeight);
        } else {
            frame = CGRectMake(self.contentX, 0, self.contentWidth, self.contentHeight);
        }
        UIView *textBackView = [[UIView alloc] initWithFrame:frame];
        textBackView.backgroundColor = [UIColor clearColor];
        textBackView.clipsToBounds = YES;
        [self addSubview:textBackView];

        // 设置默认值
        UIColor *textColor = self.contentTextColor ? : [UIColor redColor];
        UIFont *textFont = self.contentTextFont ? : [UIFont systemFontOfSize:15.0f];
        NSTextAlignment textAlign = self.contentTextAlign ? : NSTextAlignmentLeft;

        // 设置 label 属性
        label.backgroundColor = [UIColor clearColor];
        label.lineBreakMode = NSLineBreakByTruncatingTail;
        label.textColor = textColor;
        label.font = textFont;
        label.textAlignment = textAlign;
        label.userInteractionEnabled = YES;
        UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(contentClick)];
        [label addGestureRecognizer:tap1];
        [textBackView addSubview:label];
    }

    /// 开启滚动动画
    - (void)startLoopAnimation {

        // 设置默认值
        NSTimeInterval delay = 0;
        NSTimeInterval duration = 0;
        CGFloat currentContentWidth = self.contentWidth;

        // 设置第一个 label 显示的内容
        self.firstContentLabel.text = self.contentTexts[self.currentIndex];

        // 滚动时间为 0 时，停止滚动
        if (0 == self.animationDuration) {
            return;
        } else {
            if (self.animationDirection > 1) {  // 左右滚动

                // 不停顿
                delay = 0;

                // 计算文本内容长度
                currentContentWidth = [self.firstContentLabel.text sizeWithAttributes:@{NSFontAttributeName:(self.contentTextFont ? : 
                                                                                            [UIFont systemFontOfSize:15.0f])}].width;

                duration = self.animationDuration * currentContentWidth / 150;

            } else {    // 垂直滚动

                // 动画停顿时间，默认为 1.0 秒
                delay = self.animationDelay ? : 1.0f;

                duration = self.animationDuration;

                // 设置第二个 label 显示的内容
                NSInteger secondCurrentIndex  = self.currentIndex + 1;
                if (secondCurrentIndex > self.contentTexts.count - 1) {
                    secondCurrentIndex = 0;
                }
                self.secondContentLabel.text = self.contentTexts[secondCurrentIndex];
            }
        }

        CGFloat firstContentLastStartX = 0;
        CGFloat firstContentLastEndX = 0;

        CGFloat firstContentLastStartY = 0;
        CGFloat firstContentLastEndY = 0;
        CGFloat secondContentLastStartY = 0;
        CGFloat secondContentLastEndY = 0;

        // 判断滚动方向
        switch (self.animationDirection) {

            case QMarqueeViewDirectionUp: {

                firstContentLastStartY = 0;
                firstContentLastEndY = -SELF_HEIGHT;

                secondContentLastStartY = firstContentLastStartY + SELF_HEIGHT;
                secondContentLastEndY = firstContentLastEndY + SELF_HEIGHT;

                break;
            }

            case QMarqueeViewDirectionDown: {

                firstContentLastStartY = 0;
                firstContentLastEndY = SELF_HEIGHT;

                secondContentLastStartY = firstContentLastStartY - SELF_HEIGHT;
                secondContentLastEndY = firstContentLastEndY - SELF_HEIGHT;

                break;
            }

            case QMarqueeViewDirectionLeft: {

                firstContentLastStartX = self.contentWidth;
                firstContentLastEndX = -currentContentWidth;

                break;
            }

            case QMarqueeViewDirectionRight: {

                firstContentLastStartX = -currentContentWidth;
                firstContentLastEndX = self.contentWidth;

                break;
            }

            default:
                break;
        }

        // 设置开始时的 frame
        CGRect frame1;
        CGRect frame2;
        if (self.animationDirection > 1) {
            frame1 = CGRectMake(firstContentLastStartX, 0, currentContentWidth, self.contentHeight);
        } else {
            frame1 = CGRectMake(0, firstContentLastStartY, self.contentWidth, self.contentHeight);
            frame2 = CGRectMake(0, secondContentLastStartY, self.contentWidth, self.contentHeight);
        }
        self.firstContentLabel.frame = frame1;
        self.secondContentLabel.frame = frame2;

        // 开始一次滚动动画
        [UIView beginAnimations:@"" context:nil];
        [UIView setAnimationCurve:UIViewAnimationCurveLinear];
        [UIView setAnimationDuration:duration];
        [UIView setAnimationDelay:delay];
        [UIView setAnimationDelegate:self];
        [UIView setAnimationDidStopSelector:@selector(loopAnimationDidStop:finished:context:)];

        // 设置结束时的 frame
        CGRect frame3;
        CGRect frame4;
        if (self.animationDirection > 1) {
            frame3 = CGRectMake(firstContentLastEndX, 0, currentContentWidth, self.contentHeight);
        } else {
            frame3 = CGRectMake(0, firstContentLastEndY, self.contentWidth, self.contentHeight);
            frame4 = CGRectMake(0, secondContentLastEndY, self.contentWidth, self.contentHeight);
        }
        self.firstContentLabel.frame = frame3;
        self.secondContentLabel.frame = frame4;

        // 结束一次滚动动画
        [UIView commitAnimations];
    }

    /// 一次动画结束事件响应处理
    - (void)loopAnimationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {

        self.currentIndex++;
        if (self.currentIndex >= self.contentTexts.count) {
            self.currentIndex = 0;
        }

        // 重新开启滚动动画
        [self startLoopAnimation];
    }

    /// 开始滚动
    - (void)q_startAnimation {

        // 创建视图
        [self setupView];

        // 开启动画默认第一条信息
        self.currentIndex = 0;

        // 开始滚动动画
        [self startLoopAnimation];
    }

    /// 文本内容点击事件处理
    - (void)contentClick {

        if ([self.delegate respondsToSelector:@selector(didClickContentAtIndex:)]) {
            [self.delegate didClickContentAtIndex:self.currentIndex];
        }
    }

    @end

使用

1、初始化

QMarqueeView 继承自 UIView, 初始化和 UIView 一样

    // 创建跑马灯视图控件
    CGRect frame = CGRectMake(0, 50, self.view.bounds.size.width, 30);
    QMarqueeView *marqueeView = [[QMarqueeView alloc] initWithFrame:frame];

    // 常规设置，QMarqueeView 继承自 UIView, 设置和 UIView 一样
    marqueeView.layer.cornerRadius = 15;
    marqueeView.layer.masksToBounds = YES;
    marqueeView.backgroundColor = [[UIColor grayColor] colorWithAlphaComponent:0.5];
    [self.view addSubview:marqueeView];

也可以使用类方法一体式创建设置

    // 创建滚动视图，开始滚动
    CGRect frame = CGRectMake(30, 250, self.view.bounds.size.width - 100, 30);
    QMarqueeView *marqueeView = [QMarqueeView q_marqueeViewWithFrame:frame
                                                               texts:showList
                                                               color:[UIColor whiteColor]
                                                                font:nil
                                                               align:NSTextAlignmentLeft
                                                                icon:[UIImage imageNamed:@"waring1"]
                                                           direction:QMarqueeViewDirectionDown
                                                            duration:1.0
                                                               delay:0
                                                              target:self];
    [self.view addSubview:marqueeView];

2、设置显示的文本内容

文本内容存放到数组中设置

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    marqueeView.contentTexts = showList;

文本内容可选属性设置，可以设置文本内容的颜色、字体、及对齐方式

    // 显示的文本内容颜色，default is redColor
    marqueeView.contentTextColor = [UIColor whiteColor];

    // 显示的文本内容字体，default is 15.0
    marqueeView.contentTextFont = [UIFont boldSystemFontOfSize:18];

    // 显示的文本内容对齐方式，default is NSTextAlignmentLeft
    marqueeView.contentTextAlign = NSTextAlignmentCenter;

3、设置显示的图标内容

除显示文本内容外，还可以可选设置显示左侧图标

    // 显示的图标内容，可以为 nil 不显示图标
    marqueeView.contentIcon = [UIImage imageNamed:@"waring1"];

4、设置动画时间

动画时间等于 0 时不进行滚动

    // 设置动画时间
    marqueeView.animationDuration = 5.0;

5、设置动画方向

不设置时默认向上滚动

    // 设置动画方向，default is QMarqueeViewDirectionUp
    marqueeView.animationDirection = QMarqueeViewDirectionRight;

6、设置动画停顿时间
- 一次动画滚动完成后可以设置停顿时间，不设置时默认为 1.0 秒
```
    // 设置动画停顿时间，default is 1.0 秒
    marqueeView.animationDelay = 2.0;
```

7、设置点击回调代理

点击显示的内容时可以可选设置响应代理

    // 设置代理，响应滚动视图点击
    marqueeView.delegate = self;

8、开始滚动动画

添加设置完成后，开启动画

    // 开始动画
    [marqueeView q_startAnimation];

1.1 垂直滚动

1、垂直滚动，左侧对齐

    // 创建跑马灯视图控件
    CGRect frame = CGRectMake(0, 50, self.view.bounds.size.width, 30);
    QMarqueeView *marqueeView = [[QMarqueeView alloc] initWithFrame:frame];

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    marqueeView.contentTexts = showList;
    marqueeView.contentTextColor = [UIColor whiteColor];
    marqueeView.contentTextFont = [UIFont boldSystemFontOfSize:18];

    // 设置动画时间
    marqueeView.animationDuration = 0.2;

    // 常规设置
    marqueeView.backgroundColor = [UIColor colorWithRed:102/255.0f green:133/255.0f blue:253/255.0f alpha:1];
    [self.view addSubview:marqueeView];

    // 开始滚动
    [marqueeView q_startAnimation];

效果

2、垂直滚动，中间对齐

    // 创建跑马灯视图控件
    CGRect frame = CGRectMake(0, 50, self.view.bounds.size.width, 30);
    QMarqueeView *marqueeView = [[QMarqueeView alloc] initWithFrame:frame];

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    marqueeView.contentTexts = showList;
    marqueeView.contentTextColor = [UIColor whiteColor];
    marqueeView.contentTextFont = [UIFont boldSystemFontOfSize:18];

    // 设置动画时间
    marqueeView.animationDuration = 0.2;

    // 设置显示的内容对齐方式
    marqueeView.contentTextAlign = NSTextAlignmentCenter;

    // 常规设置
    marqueeView.backgroundColor = [UIColor colorWithRed:102/255.0f green:133/255.0f blue:253/255.0f alpha:1];
    [self.view addSubview:marqueeView];

    // 开始滚动
    [marqueeView q_startAnimation];

效果

3、垂直滚动，带图标

    // 创建跑马灯视图控件
    CGRect frame = CGRectMake(30, 150, self.view.bounds.size.width - 150, 30);
    QMarqueeView *marqueeView = [[QMarqueeView alloc] initWithFrame:frame];

    // 设置显示的内容
    NSArray *showList = @[@"GitHub：QianChia"];
    marqueeView.contentTexts = showList;
    marqueeView.contentTextColor = [UIColor whiteColor];

    // 设置显示的图标
    marqueeView.contentIcon = [UIImage imageNamed:@"waring1"];

    // 设置动画时间
    marqueeView.animationDuration = 0.5;

    // 常规设置
    marqueeView.layer.cornerRadius = 15;
    marqueeView.layer.masksToBounds = YES;
    marqueeView.backgroundColor = [UIColor colorWithRed:102/255.0f green:133/255.0f blue:253/255.0f alpha:1];
    [self.view addSubview:marqueeView];

    // 开始滚动
    [marqueeView q_startAnimation];

效果

4、垂直滚动，向下滚动

    // 创建跑马灯视图控件
    CGRect frame = CGRectMake(30, 200, self.view.bounds.size.width - 150, 30);
    QMarqueeView *marqueeView = [[QMarqueeView alloc] initWithFrame:frame];

    // 设置显示的内容
    NSArray *showList = @[@"GitHub：QianChia"];
    marqueeView.contentTexts = showList;
    marqueeView.contentTextColor = [UIColor whiteColor];
    marqueeView.contentIcon = [UIImage imageNamed:@"waring1"];

    // 设置动画时间
    marqueeView.animationDuration = 0.5;

    // 设置动画方向
    marqueeView.animationDirection = QMarqueeViewDirectionDown;

    // 常规设置
    marqueeView.layer.cornerRadius = 15;
    marqueeView.layer.masksToBounds = YES;
    marqueeView.backgroundColor = [UIColor colorWithRed:102/255.0f green:133/255.0f blue:253/255.0f alpha:1];
    [self.view addSubview:marqueeView];

    // 开始滚动
    [marqueeView q_startAnimation];

效果

5、垂直滚动，由类方法创建

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    // 创建跑马灯视图控件，开始滚动
    CGRect frame = CGRectMake(30, 250, self.view.bounds.size.width - 100, 30);
    QMarqueeView *marqueeView = [QMarqueeView q_marqueeViewWithFrame:frame
                                                               texts:showList
                                                               color:[UIColor whiteColor]
                                                                font:nil
                                                               align:NSTextAlignmentLeft
                                                                icon:[UIImage imageNamed:@"waring1"]
                                                           direction:QMarqueeViewDirectionDown
                                                            duration:1.0
                                                               delay:0
                                                              target:self];

    // 常规设置
    marqueeView.layer.cornerRadius = 15;
    marqueeView.layer.masksToBounds = YES;
    marqueeView.backgroundColor = [[UIColor grayColor] colorWithAlphaComponent:0.5];
    [self.view addSubview:marqueeView];

效果

1.2 水平滚动

1、水平滚动，向左滚动

    // 创建跑马灯视图控件
    CGRect frame = CGRectMake(50, 350, self.view.bounds.size.width - 100, 30);
    QMarqueeView *marqueeView = [[QMarqueeView alloc] initWithFrame:frame];

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    marqueeView.contentTexts = showList;
    marqueeView.contentTextColor = [UIColor whiteColor];
    marqueeView.contentTextFont = [UIFont boldSystemFontOfSize:18];
    marqueeView.contentIcon = [UIImage imageNamed:@"waring1"];

    // 设置动画时间
    marqueeView.animationDuration = 5.0;

    // 设置动画方向
    marqueeView.animationDirection = QMarqueeViewDirectionLeft;

    // 常规设置
    marqueeView.layer.cornerRadius = 15;
    marqueeView.layer.masksToBounds = YES;
    marqueeView.backgroundColor = [UIColor colorWithRed:102/255.0f green:133/255.0f blue:253/255.0f alpha:1];
    [self.view addSubview:marqueeView];

    // 开始滚动
    [marqueeView q_startAnimation];

效果

2、水平滚动，向右滚动

    // 创建跑马灯视图控件
    CGRect frame = CGRectMake(50, 400, self.view.bounds.size.width - 100, 30);
    QMarqueeView *marqueeView = [[QMarqueeView alloc] initWithFrame:frame];

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    marqueeView.contentTexts = showList;
    marqueeView.contentTextColor = [UIColor whiteColor];
    marqueeView.contentTextFont = [UIFont boldSystemFontOfSize:18];
    marqueeView.contentIcon = [UIImage imageNamed:@"waring1"];

    // 设置动画时间
    marqueeView.animationDuration = 5.0;

    // 设置动画方向
    marqueeView.animationDirection = QMarqueeViewDirectionRight;

    // 常规设置
    marqueeView.layer.cornerRadius = 15;
    marqueeView.layer.masksToBounds = YES;
    marqueeView.backgroundColor = [UIColor colorWithRed:102/255.0f green:133/255.0f blue:253/255.0f alpha:1];
    [self.view addSubview:marqueeView];

    // 开始滚动
    [marqueeView q_startAnimation];

效果

3、水平滚动，由类方法创建

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    // 创建跑马灯视图控件，开始滚动
    CGRect frame = CGRectMake(30, 450, self.view.bounds.size.width - 60, 30);
    QMarqueeView *marqueeView = [QMarqueeView q_marqueeViewWithFrame:frame
                                                               texts:showList
                                                               color:nil
                                                                font:nil
                                                               align:0
                                                                icon:[UIImage imageNamed:@"waring2"]
                                                           direction:QMarqueeViewDirectionLeft
                                                            duration:4.0
                                                               delay:0
                                                              target:self];

    // 常规设置
    marqueeView.layer.cornerRadius = 15;
    marqueeView.layer.masksToBounds = YES;
    marqueeView.backgroundColor = [[UIColor grayColor] colorWithAlphaComponent:0.5];
    [self.view addSubview:marqueeView];

效果

2、弹幕

具体实现代码见 GitHub 源码 QExtension

QBulletScreenView.h

    #pragma mark - QBulletScreenViewDelegate

    /// 跑马灯内容点击处理协议
    @protocol QBulletScreenViewDelegate <NSObject>

    - (void)didClickContentAtIndex:(NSInteger)index;

    @end


    #pragma mark - QBulletScreenView

    /// 弹幕滚动方向枚举
    typedef NS_ENUM(NSUInteger, QBulletScreenViewDirection) {
        QBulletScreenViewDirectionUp,
        QBulletScreenViewDirectionDown,
        QBulletScreenViewDirectionLeft,
        QBulletScreenViewDirectionRight
    };

    @interface QBulletScreenView : UIView

    /// 显示的文本内容
    @property (nonatomic, strong) NSArray *contentTexts;

    /// 显示的文本内容颜色，default is redColor
    @property (nonatomic, strong) UIColor *contentTextColor;

    /// 显示的文本内容字体，default is 15.0
    @property (nonatomic, strong) UIFont *contentTextFont;

    /// 显示的图标内容，可以为 nil 不显示图标
    @property (nonatomic, strong) UIImage *contentIcon;

    /// 动画方向，default is QBulletScreenViewDirectionLeft
    @property (nonatomic, assign) QBulletScreenViewDirection animationDirection;

    /// 动画时间，等于 0 时不滚动
    @property (nonatomic, assign) NSTimeInterval animationDuration;

    /// 代理
    @property (nonatomic, weak) id<QBulletScreenViewDelegate> delegate;

    /**
     *  开始动画
     */
    - (void)q_startAnimation;

    /**
     *  创建弹幕视图控件
     *
     *  @param frame        跑马灯对象的 frame
     *  @param texts        显示的文本内容
     *  @param color        显示的文本内容颜色，default is redColor
     *  @param font         显示的文本内容字体，default is 15.0
     *  @param icon         显示的图片内容
     *  @param direction    动画方向，default is QMarqueeViewDirectionUp
     *  @param duration     动画时间，等于 0 时不滚动
     *  @param target       代理
     *
     *  @return 弹幕视图控件
     */
    + (instancetype)q_bulletScreenWithFrame:(CGRect)frame
                                      texts:(NSArray *)texts
                                      color:(nullable UIColor *)color
                                       font:(nullable UIFont *)font
                                       icon:(nullable UIImage *)icon
                                  direction:(QBulletScreenViewDirection)direction
                                   duration:(NSTimeInterval)duartion
                                     target:(nullable id<QBulletScreenViewDelegate>)target;

    @end

QBulletScreenView.m

    #define SELF_WIDTH      self.frame.size.width
    #define SELF_HEIGHT     self.frame.size.height

    @interface QBulletScreenView ()

    /// label
    @property (nonatomic, strong) UILabel *contentLabel;

    /// 显示图片的视图
    @property (nonatomic, strong) UIImageView *imageView;

    /// 当前显示的行
    @property (nonatomic, assign) NSInteger currentIndex;

    /// 文本内容的起始位置、宽度、高度
    @property (nonatomic, assign) CGFloat contentX;
    @property (nonatomic, assign) CGFloat contentWidth;
    @property (nonatomic, assign) CGFloat contentHeight;

    /// 弹幕视图的位置、宽度、高度
    @property (nonatomic, assign) CGFloat viewX;
    @property (nonatomic, assign) CGFloat viewY;
    @property (nonatomic, assign) CGFloat viewWidth;
    @property (nonatomic, assign) CGFloat viewHeight;

    @end

    @implementation QBulletScreenView

    /// 创建弹幕视图控件
    + (instancetype)q_bulletScreenWithFrame:(CGRect)frame
                                      texts:(NSArray *)texts
                                      color:(nullable UIColor *)color
                                       font:(nullable UIFont *)font
                                       icon:(nullable UIImage *)icon
                                  direction:(QBulletScreenViewDirection)direction
                                   duration:(NSTimeInterval)duartion
                                     target:(nullable id<QBulletScreenViewDelegate>)target {

        QBulletScreenView *bulletScreenView = [[self alloc] initWithFrame:frame];

        bulletScreenView.contentTexts = texts;
        bulletScreenView.contentTextColor = color;
        bulletScreenView.contentTextFont = font;
        bulletScreenView.contentIcon = icon;
        bulletScreenView.animationDirection = direction;
        bulletScreenView.animationDuration = duartion;
        bulletScreenView.delegate = target;

        return bulletScreenView;
    }

    /// 创建视图控件
    - (void)setupView {

        // 父视图裁剪
        self.clipsToBounds = YES;

        // 控件之间的间隔值
        CGFloat margin = 10;

        // 判断是否有图标
        if (self.contentIcon) {

            // 添加 Icon 视图
            CGRect iconFrame = CGRectMake(margin, 0, SELF_HEIGHT, SELF_HEIGHT);
            self.imageView = [[UIImageView alloc] initWithFrame:iconFrame];
            self.imageView.backgroundColor = [UIColor clearColor];
            self.imageView.image = self.contentIcon;
            [self addSubview:self.imageView];

            // 计算 Texts 的 frame 值
            self.contentX = margin + SELF_HEIGHT;
            self.contentWidth = SELF_WIDTH - self.contentX - margin;

        } else {

            // 计算 Texts 的 frame 值
            self.contentX = margin * 2;
            self.contentWidth = SELF_WIDTH - self.contentX - margin;
        }
        self.contentHeight = SELF_HEIGHT;
        self.viewHeight = SELF_HEIGHT;

        // 设置默认值
        UIColor *textColor = self.contentTextColor ? : [UIColor redColor];
        UIFont *textFont = self.contentTextFont ? : [UIFont systemFontOfSize:15.0f];

        // 创建 label
        CGRect frame1 = CGRectMake(self.contentX, 0, self.contentWidth, self.contentHeight);
        self.contentLabel = [[UILabel alloc] initWithFrame:frame1];
        self.contentLabel.backgroundColor = [UIColor clearColor];
        self.contentLabel.lineBreakMode = NSLineBreakByTruncatingTail;
        self.contentLabel.textColor = textColor;
        self.contentLabel.font = textFont;
        self.contentLabel.userInteractionEnabled = YES;
        UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(contentClick)];
        [self.contentLabel addGestureRecognizer:tap1];
        [self addSubview:self.contentLabel];
    }

    /// 开启滚动动画
    - (void)startLoopAnimation {

        // 控件之间的间隔值
        CGFloat margin = 10;

        // 设置默认值
        NSTimeInterval duration = 0;
        CGFloat currentContentWidth = self.contentWidth;

        // 设置第一个 label 显示的内容
        self.contentLabel.text = self.contentTexts[self.currentIndex];

        // 滚动时间为 0 时，停止滚动
        if (0 == self.animationDuration) {
            return;
        } else {

            // 计算文本内容长度
            currentContentWidth = [self.contentLabel.text sizeWithAttributes:@{NSFontAttributeName:(self.contentTextFont ? : 
                                                                                   [UIFont systemFontOfSize:15.0f])}].width;

            CGRect frame = CGRectMake(self.contentX, 0, currentContentWidth, self.contentHeight);
            self.contentLabel.frame = frame;

            self.viewWidth = self.contentX + currentContentWidth + margin * 2;

            if (self.animationDirection > 1) {  // 左右滚动
                duration = self.animationDuration * currentContentWidth / 150;
            } else {    // 垂直滚动
                duration = self.animationDuration;
            }
        }

        CGFloat viewLastStartX = 0;
        CGFloat viewLastEndX = 0;

        CGFloat viewLastStartY = 0;
        CGFloat viewLastEndY = 0;

        // 判断滚动方向
        switch (self.animationDirection) {

            case QBulletScreenViewDirectionUp: {

                viewLastStartY = self.superview.bounds.size.height;
                viewLastEndY = -self.viewHeight;

                break;
            }

            case QBulletScreenViewDirectionDown: {

                viewLastStartY = -self.viewHeight;
                viewLastEndY = self.superview.bounds.size.height;

                break;
            }

            case QBulletScreenViewDirectionLeft: {

                viewLastStartX = self.superview.bounds.size.width;
                viewLastEndX = -self.viewWidth;

                break;
            }

            case QBulletScreenViewDirectionRight: {

                viewLastStartX = -self.viewWidth;
                viewLastEndX = self.superview.bounds.size.width;

                break;
            }

            default:
                break;
        }

        self.viewX = self.frame.origin.x;
        self.viewY = self.frame.origin.y;

        // 设置开始时的 frame
        CGRect frame1;
        if (self.animationDirection > 1) {
            frame1 = CGRectMake(viewLastStartX, self.viewY, self.viewWidth, self.contentHeight);
        } else {
            frame1 = CGRectMake(self.viewX, viewLastStartY, self.viewWidth, self.contentHeight);
        }
        self.frame = frame1;

        // 开始一次滚动动画
        [UIView beginAnimations:@"" context:nil];
        [UIView setAnimationCurve:UIViewAnimationCurveLinear];
        [UIView setAnimationDuration:duration];
        [UIView setAnimationDelay:0];
        [UIView setAnimationDelegate:self];
        [UIView setAnimationDidStopSelector:@selector(loopAnimationDidStop:finished:context:)];

        // 设置结束时的 frame
        CGRect frame2;
        if (self.animationDirection > 1) {
            frame2 = CGRectMake(viewLastEndX, self.viewY, self.viewWidth, self.contentHeight);
        } else {
            frame2 = CGRectMake(self.viewX, viewLastEndY, self.viewWidth, self.contentHeight);
        }
        self.frame = frame2;

        // 结束一次滚动动画
        [UIView commitAnimations];
    }

    /// 一次动画结束事件响应处理
    - (void)loopAnimationDidStop:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {

        self.currentIndex++;
        if (self.currentIndex >= self.contentTexts.count) {
            self.currentIndex = 0;
        }

        // 重新开启滚动动画
        [self startLoopAnimation];
    }

    /// 开始滚动
    - (void)q_startAnimation {

        // 创建视图
        [self setupView];

        // 开启动画默认第一条信息
        self.currentIndex = 0;

        // 开始滚动动画
        [self startLoopAnimation];
    }

    /// 文本内容点击事件处理
    - (void)contentClick {

        if ([self.delegate respondsToSelector:@selector(didClickContentAtIndex:)]) {
            [self.delegate didClickContentAtIndex:self.currentIndex];
        }
    }

    @end

使用

1、初始化

QBulletScreenView 继承自 UIView, 初始化和 UIView 一样

    // 创建弹幕视图控件
    CGRect frame = CGRectMake(0, 100, 0, 30);
    QBulletScreenView *bulletScreenView = [[QBulletScreenView alloc] initWithFrame:frame];

    // 常规设置，QBulletScreenView 继承自 UIView, 设置和 UIView 一样
    bulletScreenView.layer.cornerRadius = 15;
    bulletScreenView.layer.masksToBounds = YES;
    bulletScreenView.backgroundColor = [[UIColor grayColor] colorWithAlphaComponent:0.5];
    [self.view addSubview:bulletScreenView];

也可以使用类方法一体式创建设置

    // 创建弹幕视图控件，开始滚动
    CGRect frame = CGRectMake(0, 100, 0, 30);
    QBulletScreenView *bulletScreenView = [QBulletScreenView q_bulletScreenWithFrame:frame
                                                                               texts:showList
                                                                               color:[UIColor whiteColor]
                                                                                font:nil
                                                                                icon:[UIImage imageNamed:@"waring1"]
                                                                           direction:QBulletScreenViewDirectionLeft
                                                                            duration:5.0
                                                                              target:nil];
    [self.view addSubview:bulletScreenView];

2、设置显示的文本内容

文本内容存放到数组中设置

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    bulletScreenView.contentTexts = showList;

文本内容可选属性设置，可以设置文本内容的颜色、字体

    // 显示的文本内容颜色，default is redColor
    bulletScreenView.contentTextColor = [UIColor whiteColor];

    // 显示的文本内容字体，default is 15.0
    bulletScreenView.contentTextFont = [UIFont boldSystemFontOfSize:18];

3、设置显示的图标内容

除显示文本内容外，还可以可选设置显示左侧图标

    // 显示的图标内容，可以为 nil 不显示图标
    bulletScreenView.contentIcon = [UIImage imageNamed:@"waring1"];

4、设置动画时间

动画时间等于 0 时不进行滚动

    // 设置动画时间
    bulletScreenView.animationDuration = 5.0;

5、设置动画方向

不设置时默认向上滚动

    // 设置动画方向，default is QBulletScreenViewDirectionUp
    bulletScreenView.animationDirection = QBulletScreenViewDirectionLeft;

6、设置点击回调代理

点击显示的内容时可以可选设置响应代理

    // 设置代理，响应滚动视图点击
    bulletScreenView.delegate = self;

7、开始滚动动画

添加设置完成后，开启动画

    // 开始动画
    [bulletScreenView q_startAnimation];

2.1 水平向左移动

水平向左移动

    // 创建弹幕视图控件
    CGRect frame = CGRectMake(0, 100, 0, 30);   // x, width 设置无效
    QBulletScreenView *bulletScreenView = [[QBulletScreenView alloc] initWithFrame:frame];

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    bulletScreenView.contentTexts = showList;
    bulletScreenView.contentTextColor = [UIColor whiteColor];
    bulletScreenView.contentTextFont = [UIFont boldSystemFontOfSize:18];
    bulletScreenView.contentIcon = [UIImage imageNamed:@"waring1"];

    // 设置动画时间
    bulletScreenView.animationDuration = 5.0;

    // 设置动画方向
    bulletScreenView.animationDirection = QBulletScreenViewDirectionLeft;

    // 常规设置
    bulletScreenView.layer.cornerRadius = 15;
    bulletScreenView.layer.masksToBounds = YES;
    bulletScreenView.backgroundColor = [UIColor colorWithRed:102/255.0f green:133/255.0f blue:253/255.0f alpha:1];
    [self.view addSubview:bulletScreenView];

    // 开始滚动
    [bulletScreenView q_startAnimation];

效果

2.2 水平向右移动

水平向右移动

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    // 创建弹幕视图控件
    CGRect frame = CGRectMake(0, 200, 0, 30);   // x, width 设置无效
    QBulletScreenView *bulletScreenView = [QBulletScreenView q_bulletScreenWithFrame:frame
                                                                               texts:showList
                                                                               color:[UIColor whiteColor]
                                                                                font:nil
                                                                                icon:[UIImage imageNamed:@"waring1"]
                                                                           direction:QBulletScreenViewDirectionRight
                                                                            duration:5.0
                                                                              target:nil];

    // 常规设置
    bulletScreenView.layer.cornerRadius = 15;
    bulletScreenView.layer.masksToBounds = YES;
    bulletScreenView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];
    [self.view addSubview:bulletScreenView];

    // 开始滚动
    [bulletScreenView q_startAnimation];

效果

2.3 水平向上移动

水平向上移动

    // 创建弹幕视图控件
    CGRect frame = CGRectMake(10, 0, 0, 30);   // y, width 设置无效
    QBulletScreenView *bulletScreenView = [[QBulletScreenView alloc] initWithFrame:frame];

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    bulletScreenView.contentTexts = showList;
    bulletScreenView.contentTextColor = [UIColor whiteColor];
    bulletScreenView.contentTextFont = [UIFont boldSystemFontOfSize:18];
    bulletScreenView.contentIcon = [UIImage imageNamed:@"waring1"];

    // 设置动画时间
    bulletScreenView.animationDuration = 2.0;

    // 设置动画方向
    bulletScreenView.animationDirection = QBulletScreenViewDirectionUp;

    // 常规设置
    bulletScreenView.layer.cornerRadius = 15;
    bulletScreenView.layer.masksToBounds = YES;
    bulletScreenView.backgroundColor = [UIColor colorWithRed:102/255.0f green:133/255.0f blue:253/255.0f alpha:1];
    [backView addSubview:bulletScreenView];

    // 开始滚动
    [bulletScreenView q_startAnimation];

效果

2.4 水平向下移动

水平向下移动

    // 设置显示的内容
    NSArray *showList = @[@"1. Hello World",
                          @"2. 欢迎大家关注哦！",
                          @"3. GitHub：QianChia",
                          @"4. 新浪微博：QianChia0123",
                          @"5. 个人博客：cnblogs.com/QianChia"];

    // 创建弹幕视图控件
    CGRect frame = CGRectMake(10, 0, 0, 30);   // y, width 设置无效
    QBulletScreenView *bulletScreenView = [QBulletScreenView q_bulletScreenWithFrame:frame
                                                                               texts:showList
                                                                               color:[UIColor whiteColor]
                                                                                font:[UIFont boldSystemFontOfSize:18]
                                                                                icon:[UIImage imageNamed:@"waring1"]
                                                                           direction:QBulletScreenViewDirectionDown
                                                                            duration:2.0
                                                                              target:nil];

    // 常规设置
    bulletScreenView.layer.cornerRadius = 15;
    bulletScreenView.layer.masksToBounds = YES;
    bulletScreenView.backgroundColor = [UIColor colorWithRed:102/255.0f green:133/255.0f blue:253/255.0f alpha:1];
    [backView addSubview:bulletScreenView];

    // 开始滚动
    [bulletScreenView q_startAnimation];

效果

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原文链接：https://yq.aliyun.com/articles/312213

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