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]; }
演示结果如下：
没扫动手势一次,图片就轮换一次，即转场显示的图片依次为：
