更改MFMailComposeViewController navigationBar标题字体

问题描述

我有一个 MFMailComposeViewController ，当我设置主题时，它也将它设置为主题。
问题是如何自定义标题和颜色的字体？

I have a MFMailComposeViewController and when I've set the subject it also sets it as the subject.The question is how do I customize the font of the title and color?

MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
[picker setSubject:@"Feedback for MyApp"];

推荐答案

我已经改变了我的应用程序的字体所有视图控制器的所有导航栏的app-delegate。如果您不介意更改所有导航栏标题字体，请在 applicationDidFinishLaunching中添加以下内容：withOptions：

i've changed the font generally for my apps from the app-delegate for all navigation bars of all view controllers. if you don't mind it changing all of your navigation bar title fonts, put something like the following in applicationDidFinishLaunching:withOptions:

    if ([[UINavigationBar class] respondsToSelector:@selector(appearance)])
        // set the navigation bar font to "courier-new bold 14"
        [[UINavigationBar appearance] setTitleTextAttributes:
         [NSDictionary dictionaryWithObjectsAndKeys:[UIColor lightGrayColor], UITextAttributeTextShadowColor,
                                                    [NSValue valueWithUIOffset:UIOffsetMake(1, 0)], UITextAttributeTextShadowOffset,
                                                    [UIFont fontWithName:@"CourierNewPS-BoldMT" size:14.0], UITextAttributeFont,
                                                    nil]];

更新：
如果您想要特定于此例如，您可以使用appearanceWhenContainedIn：使用Alexander Akers在下面的注释中建议的参数，因为UIViewController继承自UIAppearanceContainer。我知道appearanceWhenContainedIn：适用于其他情况，例如UINavigationBar中包含的UIBarButtonItems，因此它应该适用于这种情况。

update:if you want it specific to this one case, you can probably use appearanceWhenContainedIn: using the arguments Alexander Akers suggested in the comment below, since UIViewController inherits from UIAppearanceContainer. i know appearanceWhenContainedIn: works in other cases such as UIBarButtonItems contained in UINavigationBar, so it should work similarly for this situation.

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