whose view is not in the window hierarchy!
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2015年3月25日：遇到问题whose view is not in the window hierarchy!
案例再现：在a控制器中取得当前地图定位位置进行判断，如果与正在显示的位置不同则present一个alertview。由于网络问题，判断还没开始，用户点击了a控制器进行跳转，此时显示为栈顶为b控制器。迟来的判断终于到来，问题也随之出现。
原因分析：alertview 显示时 a控制器已经不是栈顶控制器，b控制器才是。
解决方案：在alert的时候判断当前显示的是否是a控制器；（可不可行还没实现，有遇到的朋友可以提供实例）
stackoverflow上有另一的一个案例，http://stackoverflow.com/questions/11862883/whose-view-is-not-in-the-window-hierarchy/；其原因在例子中有进行解释：大致是因为在viewdidload中present了另外一个控制器，此时由于view还没显示，于是出了问题。解决方案是在viewdidappear中实现present；
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