如果使用系统自带的leftBarButtonItem来处理的话，就需要使用自定义图片，这种方法使用起来并不友好，正好在简书上看到了一位兄弟发出来的解决方案，这里把代码贴一下，有助于大家直观的理解，项目地址：
整体的思路就是使用新建一个Category用来拦截popViewControllerAnimated的方法，话不多说，直接上代码
#import <UIKit/UIKit.h>
@protocol BackButtonHandlerProtocol <NSObject>
@optional
// Override this method in UIViewController derived class to handle 'Back' button click
-(BOOL)navigationShouldPopOnBackButton;
@end
@interface UIViewController (BackButtonHandler) <BackButtonHandlerProtocol>
@end
#import "UIViewController+BackButtonHandler.h"
@implementation UIViewController (BackButtonHandler)
@end
@implementation UINavigationController (ShouldPopOnBackButton)
- (BOOL)navigationBar:(UINavigationBar *)navigationBar shouldPopItem:(UINavigationItem *)item {
if([self.viewControllers count] < [navigationBar.items count]) {
return YES;
}
BOOL shouldPop = YES;
UIViewController* vc = [self topViewController];
if([vc respondsToSelector:@selector(navigationShouldPopOnBackButton)]) {
shouldPop = [vc navigationShouldPopOnBackButton];
}
if(shouldPop) {
dispatch_async(dispatch_get_main_queue(), ^{
[self popViewControllerAnimated:YES];
});
} else {
// Workaround for iOS7.1. Thanks to @boliva - http://stackoverflow.com/posts/comments/34452906
for(UIView *subview in [navigationBar subviews]) {
if(0. < subview.alpha && subview.alpha < 1.) {
[UIView animateWithDuration:.25 animations:^{
subview.alpha = 1.;
}];
}
}
}
return NO;
}
@end
调用方式如下
-(BOOL) navigationShouldPopOnBackButton
{
//其他的可执行方法
return YES;
}
