覆盖MFMailComposeViewController的UIAppearance属性 [英] Override UIAppearance property for MFMailComposeViewController

问题描述

我使用UIAppearance协议在我的应用程序中设置UINavigationBar对象的背景图片。

  [[UINavigationBar appearance] setBackgroundImage：[UIImage imageNamed：@image-name] forBarMetrics：UIBarMetricsDefault]; 
  

我想覆盖这个MFMailComposeViewController的实例，以便显示默认样式导航栏。我尝试使用appearanceWhenContainedIn设置此项，并且这在iOS 5上可用，但在iOS 6上不适用

。

  [[UINavigationBar appearanceWhenContainedIn：[MFMailComposeViewController class]，nil] setBackgroundImage：nil forBarMetrics：UIBarMetricsDefault]; 
  

我有错误或有更好的方法来完成吗？

解决方案

通过正常措施更改MFMailComposer的外观是不可能的，但有一些解决方法你可以做，我已经使用了很多次。

向您希望实现新外观的类添加两个方法：

   - （void）applyComposerInterfaceApperance 
 {
 [[UINavigationBar appearance] setTintColor：[UIColor blueColor]]; 
} 
 
  - （void）applyGlobalInterfaceAppearance 
 {
 //我选择的默认颜色
 [[UINavigationBar外观] setTintColor：[UIColor redColor] ; 
} 
  

现在，在show方法中，应用特殊的composer界面

   - （void）showMailComposer 
 {
 if（[MFMailComposeViewController canSendMail]）
 {
 [self applyComposerInterfaceApperance]; 
 
 MFMailComposeViewController * viewController = [[MFMailComposeViewController alloc] init]; 
 viewController.mailComposeDelegate = delegate; 
 [viewController setToRecipients：mailRecepients]; 
 [viewController setSubject：mailSubject]; 
 [viewController setMessageBody：messageBody isHTML：NO]; 
 [self presentModalViewController：viewController animated：YES]; 
} 
} 
  

在您的代理中，将接口更改为（MFMailComposeViewController *）控制器didFinishWithResult：（MFMailComposeResult）结果错误：（NSError *）。 ）错误
{
//做正常的邮件编辑器在这里完成的东西
[self applyGlobalInterfaceAppearance];
}

I am using the UIAppearance protocol to set the background image of UINavigationBar objects throughout my app.

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"image-name"] forBarMetrics:UIBarMetricsDefault];

I would like to override this for instances of MFMailComposeViewController so that the default style navigation bar is displayed. I attempted to use appearanceWhenContainedIn to set this and this works on iOS 5 but not on iOS 6.

[[UINavigationBar appearanceWhenContainedIn:[MFMailComposeViewController class], nil] setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];

Am I making an error or is there a better way to accomplish this?

解决方案

Changing the appearance of a MFMailComposer through normal measures is not possible, but there is a little workaround you can do, which I've used many times before.

Add two methods to the class in which you wish to implement the new look to:

- (void)applyComposerInterfaceApperance
{
    [[UINavigationBar appearance] setTintColor:[UIColor blueColor]];
}

- (void)applyGlobalInterfaceAppearance
{
    // My default color of choice
    [[UINavigationBar appearance] setTintColor:[UIColor redColor]];
}

Now in your show method, apply the special composer interface changes you'd like to make.

- (void)showMailComposer
{
    if ([MFMailComposeViewController canSendMail]) 
    {
        [self applyComposerInterfaceApperance];

        MFMailComposeViewController *viewController = [[MFMailComposeViewController alloc] init];
        viewController.mailComposeDelegate = delegate;
        [viewController setToRecipients:mailRecepients];
        [viewController setSubject:mailSubject];
        [viewController setMessageBody:messageBody isHTML:NO];
        [self presentModalViewController:viewController animated:YES];
    }
}

And in your delegate, change the interface back to the way it was.

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    // Do normal mail composer did finish stuff in here
    [self applyGlobalInterfaceAppearance];
}

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