IOS的小知识点补充

tabbar 隐藏 后 下面有空余
1. 要隐藏的Controller init方法
UIWindow * window = [UIApplication sharedApplication].keyWindow;
UITabBarController * tmp = (UITabBarController *)window.rootViewController;
[tmp.tabBar setHidden:YES];
2.要返回的方法里
UIWindow * window = [UIApplication sharedApplication].keyWindow;
UITabBarController * tmp = (UITabBarController *)window.rootViewController;
[tmp.tabBar setHidden:NO];