自定义封装导航栏左右按钮点击事件和特定风格的控制器供多个控制器继承—— 当很多导航页面有相似的导航条时

短命女 2022-08-08 14:49 13阅读 0赞

新建指定风格的控制器如下：

编辑NavViewController.h如下：

//
    //  NavViewController.h
    //  作业整理
    //
    //  Created by apple on 15/9/14.
    //  Copyright (c) 2015年 LiuXun. All rights reserved.
    //
    
    #import <UIKit/UIKit.h>
    
    @interface NavViewController : UIViewController
    {
        UIButton *btnLeft;
        UIButton *btnRight;
    }
    
    -(void)setLeftItem:(BOOL) left setRightItem:(BOOL) RIght;
    
    -(void) afterPressLeft;
    -(void)afterPressRight;
    @end

编辑 NavViewController.m如下：

//
    //  NavViewController.m
    //  作业整理
    //
    //  Created by apple on 15/9/14.
    //  Copyright (c) 2015年 LiuXun. All rights reserved.
    //
    
    #import "NavViewController.h"
    
    @interface NavViewController ()
    
    @end
    
    @implementation NavViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        btnLeft = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];
        [btnLeft setImage:[UIImage imageNamed:@"-register_nav_icon_back"] forState:UIControlStateNormal];
        [btnLeft setImage:[UIImage imageNamed:@"-register_nav_icon_back_press"] forState:UIControlStateHighlighted];
        [btnLeft addTarget:self action:@selector(afterPressLeft) forControlEvents:UIControlEventTouchUpInside];
        
        btnRight= [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 30, 30)];
        [btnRight setImage:[UIImage imageNamed:@"wanshanziliao_icon_affirm"] forState:UIControlStateNormal];
        [btnRight setImage:[UIImage imageNamed:@"wanshanziliao_icon_affirm_press"] forState:UIControlStateHighlighted];
        [btnRight addTarget:self action:@selector(afterPressRight) forControlEvents:UIControlEventTouchUpInside];
    }
    
    - (void)didReceiveMemoryWarning {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    -(void)setLeftItem:(BOOL) left setRightItem:(BOOL) RIght
    {
        if (left) {
            self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btnLeft];
        }
        if (RIght) {
            self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btnRight];
        }
    }
    
    -(void) afterPressLeft
    {
        NSLog(@"++++");
    }
    -(void)afterPressRight
    {
        NSLog(@"-------");
    }
    @end

当别的控制器直接继承此控制器时，左右按钮都不显示。

当子控制器调用

-(void)setLeftItem:(BOOL) left setRightItem:(BOOL) RIght

方法后根据左右的 BOOL判断显不显示左右指定格式的按钮

如果要为导航栏的左右按钮添加点击事件只需重写父类的

-(void) afterPressLeft

<pre name="code" class="objc">-(void)afterPressRight

方法即可：

例如以下的导航栏都是继承此控制器

![Center][]

[Center]: /images/20220731/c20eb94618d5422cadde36064e59e790.png