更改UINavigationController導航欄的顏色

Question

我正在嘗試通過使用更改UINavigationController導航欄的顏色

self.navigationController.navigationBar.tintColor = [UIColor brownColor];   

在下面給定的代碼，但不能正常工作。

 #import "uitextviewAppDelegate.h"

#import "uitextviewViewController.h"

@implementation uitextviewAppDelegate

@synthesize window = _window;
@synthesize viewController = _viewController;
@synthesize navigationController = _navigationController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

// Override point for customization after application launch.
self.viewController = [[uitextviewViewController alloc] init];

UINavigationController *navigationController=[[UINavigationController alloc] init];

self.navigationController.navigationBar.tintColor = [UIColor brownColor];  

[navigationController pushViewController:_viewController animated:YES];

[_window addSubview:navigationController.view];

self.window.rootViewController = self.viewController;

[self.window makeKeyAndVisible];

return YES;
}

誰能說出為什么它沒有改變UINavigation Controller導航欄的顏色。

提前致謝。

Answer 1

看這兩行：

UINavigationController *navigationController=[[UINavigationController alloc] init];

self.navigationController.navigationBar.tintColor = [UIColor brownColor];  

什么將第一個navigationController與self.navigationController連接起來？

據我所知，沒有。

您需要將self.navigationController分配給navigationController 。

就像是：

self.navigationController = navigationController;