[UIView animationWithDuration:animations:]使用的注意点

apple官方文档：

在动画的过程中，UIView上的控件事件是无法响应的， ios5以前，app中所有控件都无法响应的

如果要能接受事件，需要包含UIViewAnimationOptionAllowUserInteraction 这个属性

This method performs the specified animations immediately using the UIViewAnimationOptionCurveEaseInOutand UIViewAnimationOptionTransitionNone animation options.

During an animation, user interactions are temporarily disabled for the views being animated. (Prior to iOS 5, user interactions are disabled for the entire application.)

If you want users to be able to interact with the views, include the UIViewAnimationOptionAllowUserInteraction constant in the options parameter.([UIView animateWithDuration:delay:options:animations:completion: ])