iOS核心动画Core Animation（二）

   //1.创建动画对象 
CABasicAnimation *basic = [CABasicAnimation animationWithKeyPath:@"position.y"];
    // 2.设置一些属性
    basic.fromValue = @(50); 
    basic.toValue = @(400);
    // 3.调整时间 默认是0.25s
    basic.duration = 2;
    // 4 核心动画结束后不要移除
    basic.removedOnCompletion = NO;
    basic.fillMode = kCAFillModeForwards;
    // 5.添加
    // key 标记, 作用: 用来区别不同的核心动画  可以写任意的字符串,也可以写nil.
    [self.redBtn.layer addAnimation:basic forKey:nil];

// 1.创建关键帧动画
    CAKeyframeAnimation *anim = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation.z"];
    // 2.设置属性
    anim.values = @[@(-M_PI_4 * 0.3), @(M_PI_4  * 0.3), @(-M_PI_4 * 0.3)];
    anim.repeatCount = CGFLOAT_MAX;
    anim.duration = 0.15;
    // 3.添加
    [self.redBtn.layer addAnimation:anim forKey:nil];

@interface HMViewController ()
//添加控件
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
//图片参数
@property (nonatomic, assign) int index;
@end
@implementation HMViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    _index = 1;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    _index++;
    if (_index == 4) {
        _index = 1;
    }
    NSString *fileName = [NSString stringWithFormat:@"%d",_index];
    _imageView.image = [UIImage imageNamed:fileName];
    //创建动画对象
    CATransition *anim = [CATransition animation];
    //设置动画属性
    anim.type = @"fromleft";
    anim.subtype = kCATransitionFromLeft;
    anim.startProgress = 0.5; 
    anim.duration = 2;
    // 添加动画到图层  
    [_imageView.layer addAnimation:anim forKey:nil];
}

@end

  //添加基本动画
CABasicAnimation *rotation = [CABasicAnimation animation];
    //设置动画属性
    rotation.keyPath = @"transform.rotation"; 
    rotation.toValue = @M_PI_2;
  //添加基本动画
   CABasicAnimation *position = [CABasicAnimation animation];
        //设置动画属性
    position.keyPath = @"position";
    position.toValue = [NSValue valueWithCGPoint:CGPointMake(100, 250)];
    //添加基本动画
    CABasicAnimation *scale = [CABasicAnimation animation];
     //设置动画属性
    scale.keyPath = @"transform.scale";
    scale.toValue = @0.5;
 //添加组动画对象
    CAAnimationGroup *group = [CAAnimationGroup animation];
    //设置组动画
    group.animations = @[rotation,position,scale]; 
    group.duration = 2; 
    // 取消反弹
    group.removedOnCompletion = NO;
    group.fillMode = kCAFillModeForwards;
     //添加到图层
    [_redView.layer addAnimation:group forKey:nil];