关于隐藏UITabBarController和UINavigationController

隐藏UINavigationController：

比如A页面要隐藏UINavigationController

-(void)viewWillAppear:(BOOL)animated{
     [self.navigationController setNavigationBarHidden:YES animated:YES];
}

- (void)viewDidLoad
{
    [self.navigationController setNavigationBarHidden:YES animated:NO];   
}

这两处都要加，如果viewdidload不加的话，会有一个明显的隐藏动画不美观。

如果B页面需要显示UINavigationController，就需要在B页面的viewDidload或viewWillAppear中加入：[self.navigationController setNavigationBarHidden:NO animated:YES];

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如果要C页面中隐藏UITabBarController

    CPage *c = [[CPage alloc]init];
    c.hidesBottomBarWhenPushed = YES;
    [self.navigationController pushViewController:c animated:YES];