更改UINavigationController导航栏的颜色

Question

我试图使用

更改UINavigationController导航栏的颜色

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

在下面给出的代码中，但它不起作用。

 #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;
}

任何人都可以说明为什么它没有改变UINavigation控制器导航栏的颜色。

提前致谢。

Answer 1

看看这两行：

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

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

第一个navigationController与self.navigationController之间的连接是什么？

据我所知，没什么。

您需要将self.navigationController分配给navigationController。

类似的东西：

self.navigationController = navigationController;