iOS－自定义Model转场动画－仿酷我音乐播放器效果

周末，闲来无事，仿写了酷我音乐播放器效果；

效果图如下：

实现思路：

1、实现手势处理视图旋转

2、自定义Model动画；

1、手势是利用了一个UIPanGestureRecognizer手势；

注意点:

• 利用了放射矩阵CGAffineTransform
  
  其中，详细解释见博客：
  
  http://blog.csdn.net/dyllove98/article/details/9051139

• 图层的 anchorPoint 属性设置为：(0.5 ,1)
  
  注意：应该先设置 anchorPoint，再设置 frame 属性

2、自定义转场Model动画

步骤

• 设置转场类型
• 设置转场动画代理
• 实现协议
• 细节实现
  
  需要在设置转场类型和动画代理

(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    vc.modalPresentationStyle = UIModalPresentationCustom;
    vc.transitioningDelegate = self.rotateDelegate;
}

• 遵守 UIViewControllerAnimatedTransitioning 协议实现动画方法

• 转场动画的动画时长

- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {
    return 0.25;
}

• 转场动画上下文

- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext {

    UIView *contextView = [transitionContext containerView];
    UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];

    toView.transform = CGAffineTransformMakeRotation(-M_PI_2);
    [contextView addSubview:toView];

    [UIView animateWithDuration:[self transitionDuration:transitionContext]
                          delay:(0)
         usingSpringWithDamping:0.8
          initialSpringVelocity:10
                        options:0
                     animations:^{
                         toView.transform = CGAffineTransformIdentity;
                     } completion:^(BOOL finished) {
                         [transitionContext completeTransition:YES];
                     }];
}

talk is cheap show you my code

github: https://github.com/yscGit/KuwoMusic