一、简介
	CATransition是CAAnimation的子类,用于做转场动画
	能够为图层提供移出屏幕和移入屏幕的动画效果。iOS比Mac OS X的转场动画效果少一点
	如:UINavigationController导航控制器就是通过CATransition转场动画实现了将控制器的视图推入屏幕的动画效果
	
	CATransition头文件
	动画属性:
	type:动画过渡类型
	subtype:动画过渡方向
	startProgress:动画起点(在整体动画的百分比)
	endProgress:动画终点(在整体动画的百分比)
	......
	
	二、view类自带转场动画函数
	1、单视图
	+(void)transitionWithView:(UIView*)view duration:(NSTimeInterval)duration options:
	(UIViewAnimationOptions)options
	animations:(void(^)(void))animations
	completion:(void(^)(BOOLfinished))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
	2、双视图
	+ (void)transitionFromView:(UIView*) fromView
	toView:(UIView*) toViewduration:(NSTimeInterval)durationoptions:(UIViewAnimationOptions) options
	completion:(void(^)(BOOLfinished))completion;
	参数说明:
	duration:动画的持续时间
	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
	三、应用
	注意:
	转场动画使用注意点:转场代码必须和转场动画代码写在一起,否则无效
	1、图片浏览
	实例:
	
代码实现
		@interface ViewController ()
		@property (weak, nonatomic) IBOutlet UIImageView *imageV;
@end
@implementation ViewController
		// 注意: 转场动画使用注意点:转场代码必须和转场动画代码写在一起,否则无效
		- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
		{
		    // 实现:图片浏览
		    /** 转场代码 */
		    static int index = 2;
		    NSString *imageName = [NSString stringWithFormat:@"%d",index];
		    _imageV.image = [UIImage imageNamed:imageName];
		    index++;
		    if (index == 4) {
		        index = 1;
		    }
		    /** 转场动画代码 */
		    // 创建转场动画对象
		    CATransition *anim = [CATransition animation];
		    // 设置转场类型
		    anim.type = @"pageCurl";
		    // 设置动画的方向
		    anim.subtype = kCATransitionFromLeft;
anim.duration = 3;
		    [_imageV.layer addAnimation:anim forKey:nil];
		}
		@end
	
代码实现
@interface ViewController ()
@property (weak, nonatomic) UIImageView *iconView;
@end
@implementation ViewController
- (void)viewDidLoad{
[super viewDidLoad];
		
		    UIImageView *iconView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1"]];
		    [self.view addSubview:iconView];
		    iconView.center = self.view.center;
		    iconView.backgroundColor = [UIColor greenColor];
		    self.iconView = iconView;
		    // 设置为圆角图片
		    self.iconView.layer.cornerRadius = self.iconView.frame.size.width * 0.5;
		    self.iconView.clipsToBounds = YES;
		}
		- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
		{
		    // UIView自带的转场动画
		    [UIView transitionWithView:self.iconView duration:1.0 options:UIViewAnimationOptionTransitionFlipFromLeft animations:^{ /**  执行左翻转动画,*/
		        // 从左边翻转 , 之前设置显示图片1,翻转后显示图2 -》图片1 左翻转到最后显示图片2
		
		        self.iconView.image = [UIImage imageNamed:@"2"];
} completion:^(BOOL finished) {
NSLog(@"completion");
/** 左翻转动画 结束后, 停 1 秒后,再执行 右翻转动画 */
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{ // 停 1 秒后,再执行 右翻转动画
[UIView transitionWithView:self.iconView duration:1.0 options:UIViewAnimationOptionTransitionFlipFromRight animations:^{ // 然后,从右边翻转,翻转时显示图片1 -》图片2 右翻转最后显示图片1
self.iconView.image = [UIImage imageNamed:@"1"];
} completion:nil];
		        });
		    }];
		}
		@end
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIScrollView *scrollView;
		/**< imageView1  */
		@property (nonatomic, strong) UIView *view1;
		/**< imageView2 */
		@property (nonatomic, strong) UIView *view2;
@end
@implementation ViewController
- (void)viewDidLoad{
[super viewDidLoad];
self.view.backgroundColor = [UIColor blackColor];
		    // 1. scrollView 添加 view2 子控件
		    UIView *view2 = [[UIView alloc] init];
		    view2.backgroundColor = [UIColor greenColor];
		    [self.scrollView addSubview:view2];
		    self.view2 = view2;
		    // 2. scrollView 添加 view1 子控件
		    UIView *view1 = [[UIView alloc] init];
		    view1.backgroundColor = [UIColor redColor];
		    [self.scrollView addSubview:view1];
		    self.view1 = view1;
		    // 3. frame
		    CGFloat scrollViewW = self.scrollView.frame.size.width;
		    CGFloat scrollViewH = self.scrollView.frame.size.height;
		    view1.frame = CGRectMake(0, 0, scrollViewW, scrollViewH);
		    view2.frame = CGRectMake(0, 0, scrollViewW, scrollViewH); // CGRectMake(scrollViewW, 0, scrollViewW, scrollViewH);
		    // 4. scrollView
		    self.scrollView.contentSize = CGSizeMake(scrollViewW, scrollViewH);
		    // 添加手势
		    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick:)];
		    [self.scrollView addGestureRecognizer:tap];
		}
int i = 1;
		// 监听到点击scrollView,进行翻转动画
		- (void)tapClick:(UITapGestureRecognizer *)tap{
if (i % 2 != 0) {
[UIView transitionFromView:self.view1 toView:self.view2 duration:1.0 options:UIViewAnimationOptionTransitionFlipFromTop completion:nil];
		    }else{
		        [UIView transitionFromView:self.view2 toView:self.view1 duration:1.0 options:UIViewAnimationOptionTransitionFlipFromBottom completion:nil];
		    }
		    i++;
		}
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