我的 UIBackbutton 没有出现有问题，我不确定是什么原因造成的.
i'm having a problem with my UIBackbutton not appearing and i'm not sure what is causing it.
这是我制作后退按钮图像的代码，它在我的第一个 ViewController 中:
This is my code for making the back button image, it is in my first ViewController :
UIImage *backButtonHomeImage = [[UIImage imageNamed:@"backButtonImage"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonHomeImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
当您第一次进入下一个视图时(通过按钮的转场完成)，按钮不可见，但要返回的文本可见.一旦我点击后退按钮，图像就会出现，并且在我下次点击它时会一直出现.
When you first enter the next view (done by a segue from a button) the button isn't visible but the text to go back is visible. Once i've hit the back button the image appears and it stays appeared on the next time i click it.
我不确定这是否与我的代码或它所在的文件有关，或者是否与 iOS 7 问题有关.
I'm not sure if this is an issue to do with my code, or the file it's in or if it's and iOS 7 problem.
使用 UIBarButtonItem 并显式设置后退按钮背景可能会更幸运.
You may have more luck using a UIBarButtonItem and setting the back button background explicitly.
在我自己尝试让后退按钮与 iOS 7 一起使用时，外观代理不可靠.我遇到了同样的问题，第一次显示按钮时背景没有正确显示.
The appearance proxy has been unreliable in my own attempts to get a back button working with iOS 7. I experienced the same issue with the background not showing up properly first time showing the button.
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