ios - 必须切换 View 才能让 "[[UINavigationBar appearance] setBarTintColor:[UIColor darkGrayColor]];"工作

Question

我将条形色调设置为在单击按钮时不同，但您必须切换 View 才能使以下方法生效。我不知道为什么不是。

[[UINavigationBar appearance] setBarTintColor:[UIColor darkGrayColor]];

谢谢:D

Answer 1

The reason for the error：

[[UINavigationBar appearance] setBarTintColor:[UIColor
randomColor]]; doesn't work because the UIViewController has been initialized!!!

解决方法:

(1) UIAppearance用户在AppDelegate didFinishLaunch函数中设置全局效果。

 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // Override point for customization after application launch.

    [[UINavigationBar appearance] setBarTintColor: [UIColor redColor]];
    return YES;
}

(2) 关于初始化的 UIViewController ，你应该使用 self.navigationController.navigationBar 来设置颜色，这也会影响应用程序的生命周期。

[self.navigationController.navigationBar setBarTintColor:[UIColor randomColor]];