iOS- 12处理导航控制器业务逻辑

如图所示:

跳转逻辑图示

跳转逻辑
左边控制器
代码示例:
#pragma mark- 设置就会调用
- (void)setting:(UIButton *)btn{

/*
 1.   底部条没有隐藏
 2.   处理返回按钮的样式：2.1去设置控制器去设置
 */

//   跳转到设置界面
ZYSettingTabViewController *settingVc = [[ZYSettingTabViewController alloc]init];
//   当push的时候隐藏tabBar
 //  必须在跳转之前去设置
settingVc.hidesBottomBarWhenPushed = YES;
[self.navigationController pushViewController:settingVc animated:YES];

}

右边控制器
#import "ZYSettingTabViewController.h"

 @interface ZYSettingTabViewController ()

 @end

 @implementation ZYSettingTabViewController

  - (void)viewDidLoad {
     [super viewDidLoad]

   self.navigationItem.leftBarButtonItem = [UIBarButtonItem backItemWithNorImage:@"navigationButtonReturn"
                                                                       highImage:@"navigationButtonReturnClick" 
                                                                          target:self  
                                                                          action:@selector(back) 
                                                                           title:@"返回"];

 }
 #pragma mark- 返回按钮
  - (void)back
 {

     [self.navigationController popViewControllerAnimated:YES];
 }

对返回按钮的封装

+ (instancetype)backItemWithNorImage:(NSString *)norImage
                       highImage:(NSString *)highImage
                          target:(id)target
                          action:(SEL)action
                           title:(NSString *)title
   {

     //  设置导航条左边按钮
     UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
     //  文字
    [backButton setTitle:title forState:UIControlStateNormal];
     //  图片
  [backButton setImage:[UIImage imageNamed:norImage] forState:UIControlStateNormal];
  [backButton setImage:[UIImage imageNamed:highImage] forState:UIControlStateHighlighted];
     //   文字颜色
  [backButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
  [backButton setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
  //   根据内容适配尺寸
  [backButton sizeToFit];
  //   设置左边按钮离边距的距离
  backButton.contentEdgeInsets = UIEdgeInsetsMake(0, -20, 0, 0);
  //   添加点击事件
  [backButton addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
  //   设置左边按钮
  return  [[UIBarButtonItem alloc]initWithCustomView:backButton];

  }

---

设置全局返回按钮

• 我们发现只有在push的时候，改变栈顶控制器的返回按钮，即可。
  重写push方法，进行拦截。
  /*重写push方法进行拦截--设置全局返回按钮/
  - (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
  {

   if (self.childViewControllers.count > 0) {//  非根控制器
    //  设置返回按钮，只有非根控制器，才有返回按钮（tabBar有几个子控制器）
   viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem backItemWithNorImage:@"navigationButtonReturn"highImage:@"navigationButtonReturnClick" target:self action:@selector(back) title:@"返回"];
      }

    //   真正的跳转
      [super pushViewController:viewController  animated:animated];
      }
  #pragma mark- 点击事件
   - (void)back
    {
        [self popViewControllerAnimated:YES];
   }