自定义导航栏给我双导航栏iN查看

Question

我想用我的应用程序在我的UINavigationBar中添加一个渐变。我发现它在https://github.com/chroman/CRGradientNavigationBar

我的应用程序是一个选项卡栏控制器应用程序，其中每个选项卡是一个NavigationController。我有我的代码设置为：

UINavigationController *navigationController = [[UINavigationController alloc] initWithNavigationBarClass:[CRGradientNavigationBar class] toolbarClass:nil]; 

UIColor *firstColor = [UIColor colorWithRed:255.0f/255.0f green:42.0f/255.0f blue:104.0f/255.0f alpha:1.0f]; 
UIColor *secondColor = [UIColor colorWithRed:255.0f/255.0f green:90.0f/255.0f blue:58.0f/255.0f alpha:1.0f]; 

NSArray *colors = [NSArray arrayWithObjects:firstColor, secondColor, nil]; 
// or NSArray *colors = [NSArray arrayWithObjects:(id)UIColorFromRGB(0xf16149).CGColor, (id)UIColorFromRGB(0xf14959).CGColor, nil]; 

[[CRGradientNavigationBar appearance] setBarTintGradientColors:colors]; 
[[navigationController navigationBar] setTranslucent:NO]; // Remember, the default value is YES. 

[navigationController setViewControllers:@[tabBarController]]; 

[self.window setRootViewController:navigationController]; 

但是，我得到双倍导航栏，以标题和被添加到第二uibarbuttonitems，而不是一个梯度。有什么建议么？

Answer 1

UITabBarController不应该是rootViewController的UINavigationController。请尝试设置tabBarController作为窗口RootViewController的，就像这样：

[self.window setRootViewController:tabBarController]; 

那么你将要填写与导航控制器的标签栏控制器上的viewControllers阵列，这导致每个选项卡中取得自己的导航栏，视图控制器堆栈：

UINavigationController *navigationController = [[UINavigationController alloc] initWithNavigationBarClass:[CRGradientNavigationBar class] toolbarClass:nil]; 
[tabBarController setViewControllers:@[navigationController]]; 

这将导致在底部所示的一个标签中，并且在顶部该标签导航栏标签栏控制器。如果你想要更多的标签，只需添加更多的视图控制器实例您在tabBarController设置viewControllers阵列：

UINavigationController *navigationController1 = [[UINavigationController alloc] initWithNavigationBarClass:[CRGradientNavigationBar class] toolbarClass:nil]; 
UINavigationController *navigationController2 = [[UINavigationController alloc] initWithNavigationBarClass:[CRGradientNavigationBar class] toolbarClass:nil]; 
UINavigationController *navigationController3 = [[UINavigationController alloc] initWithNavigationBarClass:[CRGradientNavigationBar class] toolbarClass:nil]; 
[tabBarController setViewControllers:@[navigationController1,navigationController2,navigationController3]]; 

每个导航控制器都将在堆栈上开始有至少1个UIViewController的，就像这样：

UINavigationController *navigationController = [[UINavigationController alloc] initWithNavigationBarClass:[CRGradientNavigationBar class] toolbarClass:nil]; 
UIViewController* viewControllerForNavigationController = [UIViewController new]; 
[navigationController setViewControllers:@[viewControllerForNavigationController]];