甲一个像素的发际线出现在工具栏的在IOS顶部边缘7

Question

我切换我的应用程序从xcode的4.6至5

我已经在具有3个按钮的导航栏右侧加入UIToolBar和我已经使用以下代码为了那个原因。

UIToolbar* tools = [[UIToolbar alloc] initWithFrame:CGRectMake(0, -25, 135, 44)]; 
    //[tools setTintColor:[UIColor colorWithRed:54/255.0f green:54/255.0f blue:54/255.0f alpha:0.0]]; 

    [tools setBackgroundColor:[UIColor clearColor]]; 
    //[tools setBarTintColor:[UIColor whiteColor]]; 
    [tools setAlpha:0.0f]; 
    [tools setClearsContextBeforeDrawing:YES]; 
    [tools setTintColor:[UIColor clearColor]]; 
    [tools setTranslucent:YES]; 

    [tools setBackgroundImage:[UIImage imageNamed:@"historyBg.png"] forToolbarPosition:UIToolbarPositionTop barMetrics:UIBarMetricsDefault]; 
    [tools setShadowImage:[UIImage imageNamed:@"historyBg.png"] forToolbarPosition:UIToolbarPositionTop]; 
    // Create the array to hold the buttons, which then gets added to the toolbar 
    NSMutableArray* buttons = [[NSMutableArray alloc] initWithCapacity:2]; 

    //Create volume control button 
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; 
    button.frame = CGRectMake(0, 0, 30, 30); 
    [button addTarget:self action:@selector(volumeControlButtonTapped:) forControlEvents:UIControlEventTouchUpInside]; 
    button.showsTouchWhenHighlighted = YES; 
    [button setBackgroundImage:[UIImage imageNamed:@"icnVolumeControl.png"] forState:UIControlStateNormal]; 
    UIBarButtonItem* bi = [[UIBarButtonItem alloc] initWithCustomView:button]; 
    volumeControl = bi; 

    [buttons addObject:bi]; 

    //Creates mute volume control button 
    btnToggleMute = [UIButton buttonWithType:UIButtonTypeCustom]; 
    btnToggleMute.frame = CGRectMake(0, 0, 30, 30); 
    [btnToggleMute addTarget:self action:@selector(ToggleSound:) forControlEvents:UIControlEventTouchUpInside]; 
    btnToggleMute.showsTouchWhenHighlighted = YES; 
    [btnToggleMute setBackgroundImage:[UIImage imageNamed:@"icnMuteVolume.png"] forState:UIControlStateNormal]; 
    [btnToggleMute setBackgroundImage:[UIImage imageNamed:@"icnNotMute.png"] forState:UIControlStateSelected]; 

    bi = [[UIBarButtonItem alloc] initWithCustomView:btnToggleMute]; 
    [buttons addObject:bi]; 

    button = [UIButton buttonWithType:UIButtonTypeCustom]; 
    button.frame = CGRectMake(0, 0, 30, 30); 
    [button addTarget:self action:@selector(playLastPlayedVideo:) forControlEvents:UIControlEventTouchUpInside]; 
    button.showsTouchWhenHighlighted = YES; 
    [button setBackgroundImage:[UIImage imageNamed:@"icnQuickPlay.png"] forState:UIControlStateNormal]; 
    [button setBackgroundImage:[UIImage imageNamed:@"[email protected]"] forState:UIControlStateSelected]; 

    bi = [[UIBarButtonItem alloc] initWithCustomView:button]; 
    [buttons addObject:bi]; 

    // stick the buttons in the toolbar 
    [tools setItems:buttons animated:NO]; 

    // and put the toolbar in the nav bar 
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:tools]; 

问题是一个象素发际出现在在IOS 7的顶部边缘我试图的所有功能。背景颜色，色调颜色，阴影图像，etc..Nothing解决了问题。

我也提到这个transition guidelines for bars in ios 7。

我发现在那里它提到了酒吧部分的外观属性，一个像素的发际线出现在iOS 7的顶部边缘，但它很烦人，如果有人不希望它应该被删除。

任何解决方案，以删除该行？

它看起来像这样

Answer 1

感谢MANIAK_dobrii用于提示一个伟大的工具revealapp，通过该工具的帮助下，我发现，在UIToolBar子视图层次中，有一个一个的UIImageView导致UIToolBar顶部的灰色线。

我看不见它使用下面的代码

[tools setBarTintColor:[UIColor clearColor]]; 
    for(UIView *view in [tools subviews]) 
     { 
      if([view isKindOfClass:[UIImageView class]]) 
      { 
       [view setHidden:YES]; 
       [view setAlpha:0.0f]; 
      } 
     } 

制成，解决了我的问题。

Answer 2

使用故事板....方式容易跟踪那些东西......没有额外的应用程序。这是iPhone故事板的快照。左侧的视图，按钮，标签层次结构.....'属性检查器'右侧的视图，按钮和标签的单独调整