iOS-CALayer图片淡入淡出动画

 
  #import  
  " 
  ViewController.h 
  " 
  
 
  
 
  @interface ViewController () 
  
@property (nonatomic,strong)CALayer *imageLayer; 
  
 
  
 
  @end 
  
 
  
 
  @implementation ViewController 
  
 
  
- ( 
  void)viewDidLoad { 
  
    [super viewDidLoad]; 
  
    UIImage *image1 = [UIImage imageNamed: 
  @" 
  test1.jpg 
  "]; 
  
    
  
     
  // 
  可以显示图片类容,layer是view的载体
 
  // 
      self.view.layer.contents = (__bridge id)(image.CGImage);
    
     
  // 
  创建出图片layer 
  
    self.imageLayer = [CALayer layer]; 
  
    self.imageLayer.frame = self.view.bounds; 
  
    [self.view.layer addSublayer:self.imageLayer]; 
  
     
  
    self.imageLayer.contents = (__bridge  
  id)(image1.CGImage); 
  
    [self performSelector:@selector(imageAnimation) withObject:nil afterDelay: 
  3]; 
  
} 
  
 
  
- ( 
  void)imageAnimation { 
  
     
  
     
  // 
  隐式动画 
  
     UIImage *image2 = [UIImage imageNamed: 
  @" 
  test2.jpg 
  "]; 
  
     
  // 
   self.imageLayer.contents = (__bridge id)(image2.CGImage); 
  
    CABasicAnimation *contentsAnimation = [CABasicAnimation animationWithKeyPath: 
  @" 
  contens 
  "]; 
  
    contentsAnimation.fromValue = self.imageLayer.contents; 
  // 
  原始图片 
  
    contentsAnimation.toValue = (__bridge  
  id)(image2.CGImage); 
  // 
  切换后图片 
  
    contentsAnimation.duration =  
  3.f; 
  
     
  
    CABasicAnimation *boundsAnimation = [CABasicAnimation animationWithKeyPath: 
  @" 
  bounds 
  "]; 
  
    boundsAnimation.fromValue = [NSValue valueWithCGRect:self.imageLayer.bounds]; 
  
    boundsAnimation.toValue = [NSValue valueWithCGRect:CGRectMake( 
  10,  
  100,  
  200,  
  200)]; 
  
    boundsAnimation.duration =  
  3.f; 
  
     
  
    CAAnimationGroup *group = [CAAnimationGroup animation]; 
  
    group.animations = @[contentsAnimation,boundsAnimation]; 
  
    group.duration =  
  3.f; 
  
     
  // 
  设置layer动画结束后的值否则会回复东湖钱的状态 
  
    self.imageLayer.contents = (__bridge  
  id)(image2.CGImage); 
  
    self.imageLayer.bounds = CGRectMake( 
  10,  
  100,  
  200,  
  200); 
  
    [self.imageLayer addAnimation:group forKey:nil]; 
  
     
  
}