#pragma mark - CABasicAnimation动画

 - (IBAction)basicAnimation:(UIButton *)sender {

     // 1.创建动画对象

     CABasicAnimation *basicAnimation = [CABasicAnimation animation];

     // 2.告诉layer层需要执行什么样的动画【后面设置的内容为CALayer的相关属性】

     basicAnimation.keyPath = @"position";

     // 3.告诉layer从哪里来，要到哪里去

     basicAnimation.fromValue = [NSValue valueWithCGPoint:CGPointMake(, )];

     basicAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(, )];

     // 如果要实现移动后不回到原来的位置

     basicAnimation.removedOnCompletion = NO;

     basicAnimation.fillMode = kCAFillModeForwards;  // 保存动画状态的内容

     // 4.设置动画持续的时长

     basicAnimation.duration = 6.0f;

     // 5.将要执行的动画添加到CALayer上

     [self.imgView.layer addAnimation:basicAnimation forKey:@"basic"];

     /*****************  翻转效果  *********************/

     CABasicAnimation *basicAnimation1 = [CABasicAnimation animation];

     basicAnimation1.keyPath = @"transform";

     // 设置的翻转到的地方

     basicAnimation1.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeRotation(M_PI_2, , , )];

     basicAnimation1.duration = 4.0f;

     [self.imgView.layer addAnimation:basicAnimation1 forKey:@"aaa"];

     // 根据key移除动画

     [self.imgView.layer removeAnimationForKey:@"basic"];

 }

 #pragma mark - CAKeyFrameAnimation动画

 - (IBAction)CAKeyFrameAnimation:(UIButton *)sender {

     // 1.创建对象

     CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animation];

     // 2.设置动画轨迹

     keyFrameAnimation.keyPath = @"transform.rotation";

     // 3.设置旋转角度(弧度的计算公式：度数 / 180 * M_PI)

     keyFrameAnimation.values = @[@(- / 180.0 * M_PI), @( / 180.0 * M_PI), @( / 180.0 * M_PI)];

     // 4.设置时长

     keyFrameAnimation.duration = 3.0f;

     // 5.添加动画到layer层

     [self.imgView.layer addAnimation:keyFrameAnimation forKey:@"ccc"];

 }

 #pragma mark - CAAnimationGroup动画

 - (IBAction)CAAnimationGroup:(UIButton *)sender {

     // 平移动画

     CABasicAnimation *basic1 = [CABasicAnimation animation];

     basic1.keyPath = @"transform.translation.y";

     basic1.toValue = @();

     // 翻转动画

     CABasicAnimation *basic2 = [CABasicAnimation animation];

     basic2.keyPath = @"transform.scale";

     basic2.toValue = @(0.5);

     // 旋转动画

     CABasicAnimation *basic3 = [CABasicAnimation animation];

     basic3.keyPath = @"transform.rotation";

     basic3.toValue = @(M_PI);

     // 创建管理各个动画的动画组

     CAAnimationGroup *group = [CAAnimationGroup animation];

     group.animations = @[basic1, basic2, basic3];

     group.duration = 5.0f;

     [self.imgView.layer addAnimation:group forKey:@"ddd"];

 }

 #pragma mark - CASpringAnimation动画

 - (IBAction)CASpringAnimation:(UIButton *)sender {

     CASpringAnimation *springAnimation = [CASpringAnimation animation];

     springAnimation.keyPath = @"transform.scale";

     springAnimation.fromValue = @;

     springAnimation.toValue = @0.25;

     springAnimation.duration = 3.0f;

     [self.imgView.layer addAnimation:springAnimation forKey:@"eee"];

 }