iOS - UIAppearance appearanceWhenContainedIn问题 [英] iOS – UIAppearance appearanceWhenContainedIn issues

问题描述

我为我的导航栏设置图像，如下所示：

  [[UINavigationBar外观] setBackgroundImage：[UIImage imageNamed： @navbar.png] forBarMetrics：UIBarMetricsDefault]; 
  

然后我不想让这个图像类的 MFMessageComposeViewController 所以我通过这样做排除它：

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

但它没有效果（navbar仍然以我的形象在 MFMessageComposeViewController ）。

解决方案

找到我的问题的解决方案：

子类 MFMessageComposeViewController

在init方法中设置 backgroundImage 到 navigationBar 到 nil





VibinOrNil Bundle（NSBundle *）nibBundleOrNil
{










$
self = [super initWithNibName：nibNameOrNil bundle：nibBundleOrNil];

if（self）{
//自定义初始化
[self.navigationBar setBackgroundImage：nil forBarMetrics：UIBarMetricsDefault];

}
return self;
}


I'm setting an image for my navigationbar like so:

[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"navbar.png"] forBarMetrics:UIBarMetricsDefault];

Then I don't want this image for classes of MFMessageComposeViewController so I exclude it by doing this:

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

But it has no effect (the navbar is still styled with my image inside the MFMessageComposeViewController). What am I missing here?

解决方案

Found out the solution to my problem:

Subclass the MFMessageComposeViewController

In the init method set the backgroundImage of the navigationBar to nil

Voilá!

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {
        // Custom initialization
        [self.navigationBar setBackgroundImage:nil forBarMetrics:UIBarMetricsDefault];

    }
    return self;
}

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