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iOS：UIView的block函数实现转场动画---单视图

日期：2017-06-24点击：371收藏

使用UIView动画函数实现转场动画——单视图

+ (void)transitionWithView:(UIView *)view duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion;

参数说明：

–duration：动画的持续时间

–view：需要进行转场动画的视图

–options：转场动画的类型

–animations：将改变视图属性的代码放在这个block中

–completion：动画结束后，会自动调用这个block

具体实例如下：

实现功能：还是往工程中导入5张图片素材,创建图像视图控件,然后通过向左或向右扫动手势实现图像视图中图片的轮换,即实现转场动画。

代码如下：

//导入图片素材

//声明属性

#import "ViewController.h" @interface ViewController () @property (strong,nonatomic)UIImageView *imageView;//图像视图 @property (assign,nonatomic)NSInteger index; //当前图片的索引 @end

//初始化,创建图像视图控件并设置图片,同时创建扫动手势,添加扫动事件

- (void)viewDidLoad { [super viewDidLoad];  //设置当前图片为第一张 self.index = 1;  //初始化图像视图 self.imageView = [[UIImageView alloc]initWithFrame:self.view.frame]; self.imageView.contentMode = UIViewContentModeScaleAspectFit; [self.imageView setImage:[UIImage imageNamed:[NSString stringWithFormat:@"s%ld.jpg",self.index]]];  //允许图像视图进行用户交互 self.imageView.userInteractionEnabled = YES; [self.view addSubview:self.imageView]; //创建扫动手势 UISwipeGestureRecognizer *leftswipe = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)]; //设置扫动方向为向左扫 leftswipe.direction = UISwipeGestureRecognizerDirectionLeft; //添加扫动手势 [self.imageView addGestureRecognizer:leftswipe];  //创建扫动手势 UISwipeGestureRecognizer *rightswipe = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(swipe:)]; //设置扫动方向为向右扫 rightswipe.direction = UISwipeGestureRecognizerDirectionRight;  //添加扫动手势 [self.imageView addGestureRecognizer:rightswipe]; }

//处理扫动手势事件,进行转场动画的创建并执行动画

#pragma mark -扫动手势 -(void)swipe:(UISwipeGestureRecognizer *)sender { //根据手势的方向改变图片的索引,一共5张图片 if (sender.direction == UISwipeGestureRecognizerDirectionLeft)//向左扫  { if (self.index >1 ) { self.index--; } else { self.index = 5; } } else //向右扫  { if (self.index <5) { self.index++; } else { self.index = 1; } } //使用block函数添加UIView单视图转场动画 [UIView animateWithDuration:1.0f animations:^{ [self.imageView setImage:[UIImage imageNamed:[NSString stringWithFormat:@"s%ld.jpg",self.index]]]; } completion:nil]; }