ios开发核心动画五：图标抖动效果--CAKeyframeAnimation

#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