如何更改UICollectionView中的导航栏背景

Question

我有一个有十几个不同视图控制器的项目。所有使用相同的代码来设置其导航栏的背景如下：

CGRect frame = CGRectMake(0, 0, [self.title sizeWithFont:[UIFont fontWithName:@"HelveticaNeue" size:28]].width, 44); 
    UILabel *titleLabel = [[UILabel alloc] initWithFrame:frame]; 
    titleLabel.text = @"Categories"; 
    titleLabel.font = [UIFont fontWithName:@"HelveticaNeue" size:22]; 
    titleLabel.backgroundColor = UIColorFromRGBWithAlpha(0x84A537, 0.5); 
    titleLabel.textAlignment = NSTextAlignmentCenter; 
    self.navigationItem.titleView = titleLabel; 

    self.navigationController.navigationBar.tintColor = UIColorFromRGBWithAlpha(0x84A537, 0.5); 
    self.navigationItem.titleView.backgroundColor = [UIColor clearColor]; 
    self.navigationController.view.backgroundColor = UIColorFromRGBWithAlpha(0x84A537, 0.1); 

他们都做工精细，除了在标题文本具有一个灰色背景的CollectionView。我已经复制并粘贴了其他VC的代码。我不知道我在做什么来造成这种情况。我设置像这样的颜色十六进制值：

//RGB color macro 
#define UIColorFromRGB(rgbValue) [UIColor \ 
colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 \ 
green:((float)((rgbValue & 0xFF00) >> 8))/255.0 \ 
blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0] 

//RGB color macro with alpha 
#define UIColorFromRGBWithAlpha(rgbValue,a) [UIColor \ 
colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 \ 
green:((float)((rgbValue & 0xFF00) >> 8))/255.0 \ 
blue:((float)(rgbValue & 0xFF))/255.0 alpha:a] 

Answer 1

似乎Collection视图的导航栏样式设置与其他视图控制器不同。对于这些，我必须在呼叫控制器中设置条形颜色，并设置导航。在收集视图中清除条形背景颜色以清除颜色。

我希望这可以帮助他人。

调用VC：

- (IBAction)imageButtonTapped:(id)sender { 
    imageCellLayout = [[ImageCellLayout alloc] init]; 

    imageViewController= [[ImageViewController alloc] initWithCollectionViewLayout:imageCellLayout]; 
    imageViewController.item = item; 
    addImageViewController.item = item; 
    imageViewController.collectionView.pagingEnabled = YES; 
    UINavigationController *nc = [[UINavigationController alloc] initWithRootViewController:imageViewController]; 
    nc.navigationBar.tintColor = UIColorFromRGBWithAlpha(0xC43F32, 0.5); 
    nc.modalPresentationStyle = UIModalPresentationPageSheet; 
    [self presentViewController:nc animated:YES completion:nil]; 

} 

集合视图：

//Title Stuff 

CGRect frame = CGRectMake(0, 0, [self.title sizeWithFont:[UIFont fontWithName:@"HelveticaNeue" size:28]].width, 44); 
UILabel *titleLabel = [[UILabel alloc] initWithFrame:frame]; 
NSString *tempTitle = item.title; 
titleLabel.text = tempTitle; 
titleLabel.font = [UIFont fontWithName:@"HelveticaNeue" size:22]; 
titleLabel.backgroundColor = [UIColor clearColor]; 
titleLabel.textAlignment = NSTextAlignmentCenter; 
self.navigationItem.titleView = titleLabel;