iOS 基本动画、关键帧动画、利用缓动函数实现物理动画效果

//设置原始画面
  UIView *showView        = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
  showView.layer.masksToBounds  = YES;
  showView.layer.cornerRadius  = 50.f;
  showView.layer.backgroundColor = [UIColor redColor].CGColor;
  [self.view addSubview:showView];
  
  //创建基本动画
  CABasicAnimation *basicAnimation = [CABasicAnimation animation];
  
  //设置属性
  basicAnimation.keyPath      = @"position";
  basicAnimation.duration     = 4.0f;
  basicAnimation.fromValue     = [NSValue valueWithCGPoint:showView.center];
  basicAnimation.toValue      = [NSValue valueWithCGPoint:CGPointMake(50, 300)];
  
  //设置动画结束位置
  showView.center = CGPointMake(50, 300);
  
  //添加动画到layer层
  [showView.layer addAnimation:basicAnimation forKey:nil];

//设置原始画面
  UIView *showView        = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
  showView.layer.masksToBounds  = YES;
  showView.layer.cornerRadius  = 50.f;
  showView.layer.backgroundColor = [UIColor redColor].CGColor;
  
  [self.view addSubview:showView];
  
  //创建关键帧动画
  CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animation];
  
  //设置动画属性
  keyFrameAnimation.keyPath       = @"position";
  keyFrameAnimation.duration       = 4.0f;
  
  keyFrameAnimation.values = @[[NSValue valueWithCGPoint:showView.center],
                 [NSValue valueWithCGPoint:CGPointMake(100, 100)],
                 [NSValue valueWithCGPoint:CGPointMake(50, 150)],
                 [NSValue valueWithCGPoint:CGPointMake(200, 200)]];
  
  //设置动画结束位置
  showView.center = CGPointMake(200, 200);
  
  //添加动画到layer层
  [showView.layer addAnimation:keyFrameAnimation forKey:nil];

//设置原始画面
  UIView *showView        = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
  showView.layer.masksToBounds  = YES;
  showView.layer.cornerRadius  = 50.f;
  showView.layer.backgroundColor = [UIColor redColor].CGColor;
  
  [self.view addSubview:showView];
  
  //创建关键帧动画
  CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animation];
  
  //设置动画属性
  keyFrameAnimation.keyPath       = @"position";
  keyFrameAnimation.duration       = 4.0f;
  
　　　　//关键处, 在这里使用的缓动函数计算点路径
  keyFrameAnimation.values = [YXEasing calculateFrameFromPoint:showView.center
                             toPoint:CGPointMake(50, 300)
                              func:BounceEaseOut
                           frameCount:4.0f * 30];
  
  //设置动画结束位置
  showView.center = CGPointMake(50, 300);
  
  //添加动画到layer层
  [showView.layer addAnimation:keyFrameAnimation forKey:nil];