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

#import <UIKit/UIKit.h>

@interface UINavigationItem (CustomBackButton)

@end

.m文件

#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

巴特西

iOS 全局修改UINavigation 后退按钮

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