layer層的轉場動畫
直接上程式碼

- (void)viewDidLoad {
    [super viewDidLoad];
    self.imageView = [[UIImageView alloc]initWithFrame:self.view.bounds ];
    self.imageView.image = [UIImage imageNamed:@"1"];
    [self.view addSubview:self.imageView];
    UIButton * btn  = [[UIButton alloc]initWithFrame:self
 
.view.bounds];
    [self.view addSubview:btn];
    [btn addTarget:self action:@selector(btnFun) forControlEvents:UIControlEventTouchDown];
    // Do any additional setup after loading the view, typically from a nib.
}
-(void)btnFun{
    CATransition * ca = [CATransition animation];
    ca.type = @"rippleEffect"
 
;
    ca.duration = 1;
    [self.view.layer addAnimation:ca forKey:@"ca"];
    self.imageView.image = [UIImage imageNamed:@"2"];
}

type屬性值說明