更改Modal的外观UIActivityViewController

Question

如何更改模态共享操作中使用的UIActivityViewController邮件撰写对象的导航栏的外观？

UIActivityViewController符合UIAppearance，所以我想下面的工作，但事实并非如此。导航栏保持默认蓝色。

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

语境：

- (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]; 
    } 

我怎样才能改变UINavigationBar的色调从蓝色变成灰色。

Answer 1

在你的应用程序委托为此，它会改变整个其中显示以往的导航栏

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

你也可以在你的应用程序中使用此更改文本颜色和字体代表

应用导航栏的颜色

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