更改 ios8 扩展导航栏颜色

Question

I am working on iOS8 App Extension (Photo Editing Extension)

I have tried these method to update the Navigation Bar color, but failed:

[[UINavigationBar appearance] setBarTintColor:[UIColor yellowColor]];
[[UINavigationBar appearance] setTintColor:[UIColor blueColor]];
[[UINavigationBar appearance] setBackgroundColor:[UIColor blueColor]];

It displays a default translucent gray nav bar.

Does anybody have idea on how to change the navigation bar color in iOS8 extension?

Answer 1

Try self.navigationController.navigationBar.barTintColor = UIColor.yellow first. This should work for some host apps but not all. Because some host apps configure the colors in UIAppearance settings.

I found some info in here: https://pspdfkit.com/blog/2017/action-extension/#uiappearance
According to the link above, the extension will "picks up the UIAppearance settings from its host app" and this has a higher priority than the "setColor" message you send to the instance.

In this case what you can do is to modify the plist of the extension:
In NSExtension dictionary you can add a key NSExtensionOverridesHostUIAppearance and set value to YES . This will make your extension override the UIApprearance setting of the host app. Unfortunately this is only available in iOS 10 and later.

Hope you find it helpful.

Answer 2

Try setting the translucency of the UINavigationBar to NO like below, I believe then it should start picking up the colours

[[UINavigationBar appearance] setTranslucent:NO];

Here's the Apple Documentation for UINavigationBar translucent property

Answer 3

I have put your code in the appDelegate didFinishLaunchWithOption

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    [[UINavigationBar appearance] setBarTintColor:[UIColor yellowColor]];
    [[UINavigationBar appearance] setTintColor:[UIColor blueColor]];
    [[UINavigationBar appearance] setBackgroundColor:[UIColor blueColor]];
    return YES;
}

And works...