ios – 当用户在UIActivityViewController上点击“更多”时,如何设置导航栏颜色？

Sublclass UIActivityViewController和override – (void)presentViewController：animated：completion：

- (void)presentViewController:(UIViewController *)viewControllerToPresent animated:(BOOL)flag completion:(void (^)(void))completion {
[viewControllerToPresent.view setTintColor:[[UINavigationBar appearance] TintColor]];
for (UIView *view in viewControllerToPresent.view.subviews) {
    if ([view isKindOfClass:[UINavigationBar class]]) {
        UINavigationBar *navigationBar = (UINavigationBar*)view;
        UIImage *navigationBarImage = [[UINavigationBar appearance] BACkgroundImageForBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
        [navigationBar setBACkgroundImage:navigationBarImage forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];
        [navigationBar settitleTextAttributes:[[UINavigationBar appearance] titleTextAttributes]];
    }
}

[super presentViewController:viewControllerToPresent animated:flag completion:^{
    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightcontent];
    if (completion) {
        completion();
    }
}];
}