#import "ViewController.h"@interface ViewController ()@property (weak, nonatomic) IBOutlet UIView *redView;@property (weak, nonatomic) IBOutlet UIImageView *imageV;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {    //设置阴影的颜色    self.imageV.layer.shadowColor = [UIColor blueColor].CGColor;    //设置阴影的不透明度：0为完全透明，1为不透明    self.imageV.layer.shadowOpacity = 1;    //设置阴影偏移量宽高偏移，正数则向右向下平移    self.imageV.layer.shadowOffset = CGSizeMake(10, 10);    //设置阴影的模糊的半径    self.imageV.layer.shadowRadius = 5;        //边框宽度,往里边走的.    self.imageV.layer.borderWidth = 2;    self.imageV.layer.borderColor = [UIColor greenColor].CGColor;            /**     *    1:image并不是在layear的图层上，而是在layear的contents上，设置圆角效果是在layear层，并不会影响到contents上的image，要想layer图层和contents有联系，则必须设置self.imageV.layer.masksToBounds，也就是把超过根层也就是layear层的部分裁减掉，所以imageView要设置圆角效果必须加上self.imageV.layer.masksToBounds，而UIView可以不用设置        2：设置圆形效果：就让UIimageview的圆角cornerRadius等于UIimageview宽度的一半     */    //设置圆角    self.imageV.layer.cornerRadius = 50;    //把超过根层以外的东西都给裁剪掉(UIview自带的层,我们称它是根层)    self.imageV.layer.masksToBounds = YES;        NSLog(@"%@",self.imageV.layer.contents);}- (void)UIViewLayer {    //设置阴影的颜色    self.redView.layer.shadowColor = [UIColor blueColor].CGColor;    //设置阴影的不透明度    self.redView.layer.shadowOpacity = 1;    self.redView.layer.shadowOffset = CGSizeMake(-30, -30);    //设置阴影的模糊的半径    self.redView.layer.shadowRadius = 5;        //边框宽度,往里边走的.    self.redView.layer.borderWidth = 2;    self.redView.layer.borderColor = [UIColor greenColor].CGColor;            //设置圆角    self.redView.layer.cornerRadius = 50;}@end