iOS 解决1。返回时的黑边问题、2。controller的抖动问题

- (void)loadView {[super loadView];self.navigationController.navigationBar.hidden = YES;return;
}
-(void)viewWillAppear:(BOOL)animated
{[super viewWillAppear:animated];[self.navigationController setNavigationBarHidden:YES animated:YES];
}