iOS 全局修改UINavigation 后退按钮

 

将导航栏的后退按钮中的文字去掉一直是老大难问题,现在可以使用运行时机制,将后退按钮文字清空

创建UINavigationItem的category,直接上代码

.h文件

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#import <UIKit/UIKit.h>   @interface UINavigationItem (CustomBackButton) @end

　　

.m文件

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#import "UINavigationItem+CustomBackButton.h" #import <objc/runtime.h>   @implementation UINavigationItem (CustomBackButton)   +(void)load{     static dispatch_once_t onceToken;     dispatch_once(&onceToken, ^{         Method originalMethodImp = class_getInstanceMethod(self, @selector(backBarButtonItem));         Method destMethodImp = class_getInstanceMethod(self, @selector(myCustomBackButton_backBarbuttonItem));         method_exchangeImplementations(originalMethodImp, destMethodImp);     }); }   -(UIBarButtonItem *)backBarButtonItem{     return [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStyleBordered target:nil action:NULL]; }   static char kCustomBackButtonKey; -(UIBarButtonItem *)myCustomBackButton_backBarbuttonItem{     UIBarButtonItem *item = [self myCustomBackButton_backBarbuttonItem];     if (item) {         return item;     }     item = objc_getAssociatedObject(self, &kCustomBackButtonKey);     if (!item) {         item = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStyleBordered target:nil action:NULL];         objc_setAssociatedObject(self, &kCustomBackButtonKey, item, OBJC_ASSOCIATION_RETAIN_NONATOMIC);     }     return item; }   - (void)dealloc {     objc_removeAssociatedObjects(self); }   @end

注意

#import <objc/runtime.h>

 

然后在Appdelegate中导入即可

#import "UINavigationItem+CustomBackButton.h"

 

原文链接:http://blog.csdn.net/zhangao0086/article/details/22432387