问题描述
在UINavigationController上按UIViewController时的默认行为是操作系统显示一个后退按钮，再次关闭UIViewController。
The default behaviour when pushing a UIViewController on a UINavigationController is for the OS to display a back button that pops the UIViewController off again.
我想要设置这个后退按钮的一个不同的行为（返回两个屏幕） - 无论如何我可以做到这一点，而无需创建我自己的自定义图形等后退按钮。
I have the desire to set a different behavior for this back button (to go back two screens) - is there anyway I can do this without having to create my own back button with custom graphic etc.
谢谢：）
推荐答案
正如我原先怀疑的那样，这是不可能的任何特别简单的方法。所以在创建任何自定义UIBarButtonItem时也适用相同的方法，只需从Google获取后退按钮图标....
As I half suspected originally, this isn't possible any exceptionally easy way. So same method applies when creating any custom UIBarButtonItem, just have to source the back button icon from Google....
UIButton *backButtonInternal = [[UIButton alloc] initWithFrame:CGRectMake(0,0,54,30)];
[backButtonInternal setBackgroundImage:[UIImage imageNamed:@"backButton.png"] forState:UIControlStateNormal];
boldSystemFontOfSize:12]];
[backButtonInternal addTarget:self action:@selector(backButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *backBarButton = [[UIBarButtonItem alloc] initWithCustomView:backButtonInternal];
[backButtonInternal release];
[[self navigationItem] setLeftBarButtonItem:backBarButton];
[backBarButton release];
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