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  • ios代理的使用,正向传值,逆向传值

    #import <UIKit/UIKit.h>
    #import "SubViewController.h"
    @interface ViewController : UIViewController<SubViewControllerDelegate>
    
    
    @end
    
    #import "ViewController.h"
    
    @interface ViewController ()
    {
        SubViewController *_subViewController;
    }
    @end
    
    @implementation ViewController
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        
        _subViewController = [[SubViewController alloc]init];
        
        self.view.backgroundColor = [UIColor orangeColor];
        _subViewController.delegate = self;
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        btn.frame = CGRectMake(10, 30,200 , 30);
        [btn setTitle:@"跳转到SubViewController" forState:UIControlStateNormal];
        [btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        [btn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:btn];
        
        
        UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeSystem];
        btn1.frame = CGRectMake(10, 100, 200, 30);
        [btn1 setTitle:@"让SubViewController 变色" forState:UIControlStateNormal];
        [btn1 setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        [btn1 addTarget:self action:@selector(btn1Click) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:btn1];
        // Do any additional setup after loading the view, typically from a nib.
    }
    
    -(void)btn1Click
    {
        _subViewController.view.backgroundColor = [UIColor redColor];
    }
    -(void)btnClick
    {
        [self presentViewController:_subViewController animated:YES
        completion:^{
            
        }];
    }
    
    -(void)changeColoer
    {
        self.view.backgroundColor = [UIColor purpleColor];
    }
    - (void)didReceiveMemoryWarning {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    @end
    

    #import <UIKit/UIKit.h>
    
    
    @protocol SubViewControllerDelegate <NSObject>
    
    -(void)changeColoer;
    
    @end
    
    @interface SubViewController : UIViewController
    @property(nonatomic,weak)__weak id<SubViewControllerDelegate>delegate;
    
    @end
    

    #import <UIKit/UIKit.h>
    
    
    @protocol SubViewControllerDelegate <NSObject>
    
    -(void)changeColoer;
    
    @end
    
    @interface SubViewController : UIViewController
    @property(nonatomic,weak)__weak id<SubViewControllerDelegate>delegate;
    
    @end
    

    这个小demo中我建立了两个视图控制器,一个是ViewController还有一个是SubViewController 

    两个页面能够进行相互跳转

    点击SubViewController 中的变色button能够将ViewController中的颜色改变

    点击ViewController中的变色button也能够将SubView中的颜色改变

    代理实质就是指针的传递

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  • 原文地址:https://www.cnblogs.com/jzssuanfa/p/7055162.html
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