调整UINavigationBar框架的大小会在视图控制器的视图中留下黑色无响应的视图区域

Question

我试图调整UINavigationBar的高度以使其更小但我的视图显示导航栏曾经是黑色视图。我尝试改变我的视图框架以覆盖这个黑色区域，但它似乎没有起作用。

代码：

- (IBAction)reduceNavigationBarHeight:(id)sender {

    CGRect frameToChange = self.navigationController.navigationBar.frame;
    frameToChange.size.height -= 5;
    self.navigationController.navigationBar.frame = frameToChange;

    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y -= 5;
    viewFrame.size.height += 5;
    self.view.frame = viewFrame;

}

Answer 1

我认为它是状态栏，你可以隐藏

    if ([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)])
    {
        // iOS 7
        [self performSelector:@selector(setNeedsStatusBarAppearanceUpdate)];
    } else 
    {
        // iOS 6
        [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];
    }

    - (BOOL)prefersStatusBarHidden {
        return YES;
    }

Answer 2

请尝试以下代码

-(void)viewDidLayoutSubviews
{
  CGRect frameToChange = self.navigationController.navigationBar.frame;
  frameToChange.size.height -= 5;
  self.navigationController.navigationBar.frame = frameToChange;

}

或

如果您正在使用Autolayout -

CGRect frameToChange = self.navigationController.navigationBar.frame;

[self.view addConstraint:[NSLayoutConstraint constraintWithItem:navigationBar attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeHeight multiplier:1 constant:frameToChange.size.height - 5.0]];