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我试图改变背景颜色的MFMailComposeViewController在iOS7但我不能使它发挥作用.

我正在使用以下剪辑:

MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
picker.mailComposeDelegate = self;

if([picker.navigationBar respondsToSelector:@selector(barTintColor)]) {
    // iOS7
    picker.navigationBar.barTintColor = READER_NAVIGATION_BAR_BACKGROUND_COLOR;
    // Set back button arrow color
    [picker.navigationBar setTintColor:READER_NAVIGATION_BAR_BACK_BUTTON_ARROW_COLOR];

    // Set Navigation Bar Title Color
    [picker.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObject:READER_NAVIGATION_BAR_TITLE_NORMAL_FONT_COLOR forKey:UITextAttributeTextColor]];

    // Set back button color
    [[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:READER_NAVIGATION_BAR_BUTTONS_FONT_COLOR, UITextAttributeTextColor,nil] forState:UIControlStateNormal];

} 

有谁知道如何改变iOS7中的bakcground颜色MFMailComposeViewController？

无论我似乎尝试什么,在用户选择通过电子邮件发送链接时出现的电子邮件屏幕(它是a MFMailComposeViewController),按钮始终是默认的蓝色.

我在我的AppDelegate中有这个:

[[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:0.000 green:156/255.0 blue:51/255.0 alpha:1]];
[[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];
[[UINavigationBar appearance] setTitleTextAttributes:@{ NSForegroundColorAttributeName: [UIColor whiteColor] }];

它确实为标题MFMailComposeViewController而不是按钮着色.我该如何做到这一点？

当我在其他地方把它变成白色时,它也会使我的状态栏保持黑色.