UINavigationController全局和以编程方式更改导航栏色调颜色

Question

此代码可以更改UINavigationBar应用程序中任何位置的颜色.但是,我注意到它并没有改变UIColor所UINavigationBar使用的 UINavigationController(我来自a UIStoryboard).

UIColor* navBarColor = [UIColor colorWithRed:arc4random()%100/100.0 
                                       green:arc4random()%100/100.0 
                                        blue:arc4random()%100/100.0 
                                       alpha:1];
[[UINavigationBar appearance] setTintColor:navBarColor];

[[UINavigationBar appearance] setBarStyle:UIBarStyleBlackTranslucent];
[[UINavigationBar appearance] setAlpha:0.7];

有没有办法访问导航栏的appearance对象UINavigationController's？我知道如何设置单个控制器的色调,但我想对它们的外观进行全局控制.

更新:这是我的错误,代码确实改变了UIColor所有UINavigationBars,但它需要覆盖和揭示根导航控制器(例如呈现模态视图控制器),然后它将重新绘制自己的新UIColors!

谢谢!

Answer 1

现在在iOS 8中,我们可以通过以下方式设置色彩: -

self.navigationController.navigationBar.barTintColor = [UIColor redColor];

Answer 2

当你宣布你的时候UINavigationController,试试这个:

UINavigationController *myNavController = 
[[UINavigationController alloc] initWithRootViewController:myRootViewController];
myNavController.navigationBar.tintColor = 
    [UIColor colorWithRed:arc4random() % 100 / 100.0f
                    green:arc4random() % 100 / 100.0f
                     blue:arc4random() % 100 / 100.0f
                    alpha:1.0f];

Answer 3

您可以使用appearance代理全局更改条形颜色:

NSDictionary *textTitleOptions = 
[NSDictionary dictionaryWithObjectsAndKeys:[UIColor darkGrayColor], 
                                           UITextAttributeTextColor, 
                                           [UIColor whiteColor],  
                                           UITextAttributeTextShadowColor, nil];

[[UINavigationBar appearance] setTitleTextAttributes:textTitleOptions];
textTitleOptions = 
 [NSDictionary dictionaryWithObjectsAndKeys:[UIColor darkGrayColor], 
                                            UITextAttributeTextColor, nil];
[[UINavigationBar appearance] setTintColor:[UIColor redColor]];
[[UIToolbar appearance] setTintColor:[UIColor redColor]];
[[UIBarButtonItem appearance] setTintColor:[UIColor redColor]];

Answer 4

可以在此处找到立即更改导航栏颜色并记住后续启动首选项的完整解决方案： iPhone iOS 如何按需重绘 UINavigationBar？