iOS navigation 隐藏首页或者我的页面的首页面的导航条，下个页面如果也是隐藏的，那么请用这个
-(void)viewWillAppear:(BOOL)animated{
[superviewWillAppear:animated];
[self.navigationController setNavigationBarHidden:YES animated:NO];
}
-(void)viewWillDisappear:(BOOL)animated{
[superviewDidDisappear:animated];
[self.navigationController setNavigationBarHidden:NO animated:NO];
}
如果用这个，首页可以隐藏，但是下个页面继续是隐藏将会失效
-(void)viewDidDisappear:(BOOL)animated{
[superviewDidDisappear:animated];
[self.navigationController setNavigationBarHidden:NO animated:NO];
}
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