IOS Block动画

● + (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^)(BOOL finished))completion

方法调用完毕后,相当于执行了下面两句代码:

// 添加toView到父视图
[fromView.superview addSubview:toView];

// 把fromView从父视图中移除

[fromView.superview removeFromSuperview];

参数解析:

● duration:动画的持续时间
● options:转场动画的类型
● animations:将改变视图属性的代码放在这个block中

● completion:动画结束后,会自动调用这个block