#import "ViewController.h"@interface ViewController ()
@property(nonatomic,strong)CALayer *imageLayer;
@property(nonatomic,strong)CALayer *maskLayer;
@property(nonatomic,strong)UIImage *imageContents;
@property(nonatomic,strong)UIImage *maskContents;
@end@implementation ViewController- (void)viewDidLoad
{
[super viewDidLoad]; //获取图片
self.imageContents=[UIImage imageNamed:@""];
self.maskContents=[UIImage imageNamed:@""]; //创建图片layer
self.imageLayer=[CALayer layer];
self.imageLayer.frame=CGRectMake(, , , );
self.imageLayer.contents=(__bridge id)self.imageContents.CGImage;
[self.view.layer addSublayer:self.imageLayer]; //创建出遮罩layer
self.maskLayer=[CALayer layer];
self.maskLayer.frame=self.imageLayer.bounds;
self.maskLayer.contents=(__bridge id)self.maskContents.CGImage; //给图片layer提供遮罩的layer
self.imageLayer.mask=self.maskLayer; //3秒后做做改变maskLayer的Frame动画
[self performSelector:@selector(layerAnimation) withObject:nil afterDelay:];}
-(void)layerAnimation
{
self.maskLayer.frame=CGRectMake(, , , );
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];}@end