whose view is not in the window hierarchy 这样的提示往往是 层次结构 乱了，程序无法跳转 1、在 - (void)viewDidLoad 中跳转回出现上述情况 来源：oschina链接：https://my.oschina.net/u/1451688/blog/702615 标签 whose view is not in the window hierarchy
