ios - uinavigationbar 背景图像隐藏标题

Question

当我将背景图像添加到 uinavigationbar 时，它会隐藏 uinavigationbar 上的标题，

这是我的代码，

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
       ...
       ...

     [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed: @"BarBg.png"] forBarMetrics:UIBarMetricsDefault];
}

类中的代码:

    int height = self.navigationController.navigationBar.frame.size.height;
    int width = self.navigationController.navigationBar.frame.size.width;

    UILabel *navLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, width, height)];
    navLabel.text=@"Categories";
    navLabel.backgroundColor = [UIColor clearColor];
    navLabel.textColor = [UIColor whiteColor];
    navLabel.font = [UIFont boldSystemFontOfSize:17];
    navLabel.textAlignment = NSTextAlignmentCenter;
    self.navigationItem.titleView = navLabel;

编写此代码后，我无法在导航栏上看到标题，标题位于导航栏图像后面。

请帮忙，提前致谢..

Answer 1

不要将标签设置为UINavigationBar的titleView，而是将UILabel添加为NavigationBar的 subview ，如下所示...

[self.navigationController.navigationBar addSubview:navLabel];
[self.navigationController.navigationBar bringSubviewToFront:navLabel];