I have an iPad app (XCode5, ARC, iOS7, Storyboards with a UITabBarController controlling the navigation). On one view, I have some required fields that I check for in I have an iPad app (XCode5, ARC, iOS7, Storyboa
阅读背景：
如何防止用户离开视图控制器？
来源：互联网
分享到：
