//  ViewController.m//  01-CALayer-基本使用(了解)#import "ViewController.h"@interface ViewController ()@property (weak, nonatomic) IBOutlet UIView *redView;@property (weak, nonatomic) IBOutlet UIImageView *imageView;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.           }- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    // 图层形变        // 缩放    [UIView animateWithDuration:1 animations:^{        //        _redView.layer.transform = CATransform3DMakeRotation(M_PI, 1, 1, 0);//        _redView.layer.transform = CATransform3DMakeScale(0.5, 0.5, 1);                // 快速进行图层缩放,KVC        // x,y同时缩放0.5//        [_redView.layer setValue:@0.5 forKeyPath:@"transform.scale"];                [_redView.layer setValue:@(M_PI) forKeyPath:@"transform.rotation"];                    }];        }- (void)imageLayer{    // cornerRadiu设置控件的主层边框    _imageView.layer.cornerRadius = 50;        NSLog(@"%@",_imageView.layer.contents)    ;    // 超出主层边框的内容全部裁剪掉    _imageView.layer.masksToBounds = YES;        // 设置边框    _imageView.layer.borderColor = [UIColor whiteColor].CGColor;    _imageView.layer.borderWidth = 1;        // 如何判断以后是否需要裁剪图片，就判断下需要显示图层的控件是否是正方形。}- (void)viewLayer{    // 设置阴影    // Opacity：不透明度    _redView.layer.shadowOpacity = 1;    //    _redView.layer.shadowOffset = CGSizeMake(10, 10);    // 注意：图层的颜色都是核心绘图框架，通常。CGColor    _redView.layer.shadowColor = [UIColor yellowColor].CGColor;    _redView.layer.shadowRadius = 10;            // 圆角半径    _redView.layer.cornerRadius = 50;        // 边框    _redView.layer.borderWidth = 1;    _redView.layer.borderColor = [UIColor whiteColor].CGColor;}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end