导航栏的按钮，右边的按钮是可以自己随意添加的。但左边的返回按钮怎么定制？你会说，添加一个自己的按钮呗！你可以试试看，这样行不行。
正确的答案是重载UINavigationController类的pushViewController:animated方法。
#import <UIKit/UIKit.h>
@interface MyNavigationController: UINavigationController {
}
@end
#import "MyNavigationController.h"
@implementation MyNavigationController
-(void)popself
{
[self popViewControllerAnimated:YES];
}
-(UIBarButtonItem*) createBackButton
{
return [[UIBarButtonItem alloc]
initWithTitle:@"返回"
style:UIBarButtonItemStyleBordered
target:self
action:@selector(popself)];
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
[super pushViewController:viewControlleranimated:animated];
if (viewController.navigationItem.leftBarButtonItem== nil && [self.viewControllers count] > 1) {
viewController.navigationItem.leftBarButtonItem =[self createBackButton];
}
}
@end
使用MyNavigationController替换UINavigationController。或者直接创建一个UINavigationController的新类别