#import "ViewController.h"#define angle2Rad(angle) ((angle) / 180.0 * M_PI)@interface ViewController ()@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 {                /**     1:UIBezierPath:是绘制路径的类，moveToPoint设置起点，addLineToPoint，从起点绘制一条路径，在执行addLineToPoint，则从终点作为起点，在绘制一条路径，要转为CGPath     *     */    //1.创建动画对象    CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];        anim.duration = 2;        UIBezierPath *path = [UIBezierPath bezierPath];    [path moveToPoint:CGPointMake(50, 50)];    [path addLineToPoint:CGPointMake(300, 50)];    [path addLineToPoint:CGPointMake(300, 400)];        anim.keyPath =  @"position";    anim.path = path.CGPath;        [self.imageV.layer addAnimation:anim forKey:nil];}//图标抖动- (void)icon {        //1.创建动画对象    CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];        //2.设置属性值    /**1:keyPath为layear下的属性的keypath路径 2：values是一个数组，在values数组里定义的对象都会产生动画效果，让图标先向左移动-3弧度，再动画回来移动到3弧度，在动画移动到-3，无限重复       2：也可以设置动画的翻转效果：anim.values = @[@(angle2Rad(-3)),@(angle2Rad(3))],anim.autoreverses，这样执行完values里的动画到3弧度后，还会动画回来继续重复,否则不会产生动画       3：再把动画添加到layear层上，核心动画都是作用砸layear层上     *     */    anim.keyPath = @"transform.rotation";    anim.values = @[@(angle2Rad(-3)),@(angle2Rad(3)),@(angle2Rad(-3))];        //3.设置动画执行次数    anim.repeatCount =  MAXFLOAT;        anim.duration = 0.5;        //anim.autoreverses = YES;            [self.imageV.layer addAnimation:anim forKey:nil];        }@end