更改模態UIActivityViewController的外觀

Question

如何更改模式共享操作中使用的UIActivityViewController郵件撰寫對象的導航欄的外觀？

UIActivityViewController符合UIAppearance ，所以我認為以下內容可以工作，但不能。 導航欄保持默認藍色。

activityVC.navigationController.navigationBar.tintColor = [UIColor greyColor];

語境：

    - (IBAction)share {
        NSString *textToShare = ...;
        NSURL *url = ...;

        NSArray *activityItems = [[NSArray alloc]  initWithObjects:textToShare,url,nil];

        UIActivity *activity = [[UIActivity alloc] init];
        NSArray *applicationActivities = [[NSArray alloc] initWithObjects:activity, nil];
        UIActivityViewController *activityVC =
        [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:applicationActivities];
        [activityVC setExcludedActivityTypes:[NSArray arrayWithObjects:                                              UIActivityTypeMessage,UIActivityTypeCopyToPasteboard,
UIActivityTypeAssignToContact,UIActivityTypePostToWeibo,                                              UIActivityTypePrint,UIActivityTypeSaveToCameraRoll,
                                              nil]];

        activityVC.navigationController.navigationBar.tintColor = [UIColor greyColor];

        [self presentViewController:activityVC animated:YES completion:nil];
    }

如何將UINavigationBar的色調從藍色更改為灰色。

Answer 1

在您的應用程序委托中執行此操作，它將更改整個應用程序中顯示導航欄的導航欄的顏色

[[UINavigationBar appearance] setTintColor:[UIColor colorWithRed:.9 green:.9 blue:.9 alpha:1]];

您還可以在“應用程序代表”中使用此方法更改文本顏色和字體

NSDictionary *navbarTitleTextAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                           [UIColor redColor],UITextAttributeTextColor,
                                           [UIFont fontWithName:@"Arial" size:19],UITextAttributeFont,
                                           nil];
[[UINavigationBar appearance] setTitleTextAttributes:navbarTitleTextAttributes];