自定義導航欄給我雙導航欄iN查看

Question

我想用我的應用程序在我的UINavigationBar中添加一個漸變。我發現它在https://github.com/chroman/CRGradientNavigationBar

我的應用程序是一個選項卡欄控制器應用程序，其中每個選項卡是一個NavigationController。我有我的代碼設置爲：

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，我得到雙倍導航欄，以標題和被添加到第二uibarbuttonitems，而不是一個梯度。有什麼建議麼？

Answer 1

UITabBarController不應該是rootViewController的UINavigationController。請嘗試設置tabBarController作爲窗口RootViewController的，就像這樣：

[self.window setRootViewController:tabBarController]; 

那麼你將要填寫與導航控制器的標籤欄控制器上的viewControllers陣列，這導致每個選項卡中取得自己的導航欄，視圖控制器堆棧：

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

這將導致在底部所示的一個標籤中，並且在頂部該標籤導航欄標籤欄控制器。如果你想要更多的標籤，只需添加更多的視圖控制器實例您在tabBarController設置viewControllers陣列：

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]]; 

每個導航控制器都將在堆棧上開始有至少1個UIViewController的，就像這樣：

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