CALayer设置图片

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic,strong) UIImageView *imageView;
@property (nonatomic,strong) CABasicAnimation *anim;
@property (nonatomic,strong) CALayer *imageLayer;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self.view addSubview:self.imageView];
    [self.view.layer addSublayer:self.imageLayer];
}

- (CALayer *)imageLayer {
    if (!_imageLayer) {
        _imageLayer = [CALayer layer];
        _imageLayer.frame = CGRectMake(100, 150, 100, 100);
        _imageLayer.backgroundColor = [UIColor redColor].CGColor;
        _imageLayer.contents = (id)[UIImage imageNamed:@"zrx4.jpg"].CGImage;
    }
    return _imageLayer;
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [self.imageView.layer addAnimation:self.anim forKey:nil];
}

- (CABasicAnimation *)anim {
    if (!_anim) {
        //1.创建动画对象
        _anim = [CABasicAnimation animation];
        //2.设置动画属性.
        _anim.keyPath = @"position.y";
        _anim.toValue = @(400);
        //动画完成时会自动删除动画
        _anim.removedOnCompletion = YES;
        //动画完成时保持什么状态
        _anim.fillMode = kCAFillModeForwards;
    }
    return _anim;
}

///创建UIImageView
- (UIImageView *)imageView {
    if (!_imageView) {
        _imageView = [[UIImageView alloc] init];
        _imageView.frame = CGRectMake(100, 100, 30, 30);
        _imageView.contentMode = UIViewContentModeScaleAspectFit;
        _imageView.backgroundColor = [[UIColor redColor] colorWithAlphaComponent:0.6];
    }
    return _imageView;
}

@end