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  • target-action传值

    Target-Action传值

    实质就是:A页面要给B页面传值,A就提供接口出去,抓A到B内部来,A间接调用自己内部方法(相当于,A把自己内部需                     要操作的方法,传到B内来,到B内部进行赋值,这样就不存在訪问不到各自的局部实例变量)

          @property (nonatomic,assign)id traget;  @property (nonatomic,assign)SEL action;

           [self.traget performSelector:self.action withObject:nil];(是否须要传參数自己定,最多2个)

    代码例如以下:

    #import "FirstViewController.h"
    #import "SecondViewController.h"
    #import "UIButton+Create.h"
    @interface FirstViewController ()
    {
        UILabel * _label;
    }
    @end
    
    @implementation FirstViewController
    - (void)dealloc
    {
        [_label release];
        [super dealloc];
    }
    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
    {
        self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
        if (self) {
            // Custom initialization
        }
        return self;
    }
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
        
        
        self.view.backgroundColor = [UIColor redColor];
        self.navigationItem.title = @"首页";
        
        _label = [[UILabel alloc]initWithFrame:CGRectMake(50, 80, 200, 30)];
        _label.backgroundColor = [UIColor greenColor];
        
        //    _label.text = self.text;
        [self.view addSubview:_label];
        
        
        
        UIButton * button = [UIButton systemButtonWithFrame:CGRectMake(100, 120, 50, 50) title:@"Push" target:self action:@selector(didClickButtonAction)];
        [self.view addSubview:button];
        
        
    	// Do any additional setup after loading the view.
    }
    
    - (void)didClickButtonAction
    {
        
      
        SecondViewController * secondVC = [[SecondViewController alloc]init];
        secondVC.target = self;
        secondVC.action = @selector(didClick:);
        [self.navigationController pushViewController:secondVC animated:YES];
        [secondVC release];
    }
    
    - (void)didClick:(NSString *)text
    {
        _label.text = text;
    }
    
    - (void)didReceiveMemoryWarning
    {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    @end
    

    #import <UIKit/UIKit.h>
    
    @interface SecondViewController : UIViewController
    
    @property (nonatomic,assign)id target;
    @property (nonatomic,assign)SEL action;
    @end
    

    #import "SecondViewController.h"
    #import "FirstViewController.h"
    #import "UIButton+Create.h"
    @interface SecondViewController ()
    {
        UITextField * _textField;//创建一个输入框
    }
    @end
    @implementation SecondViewController
    
    - (void)dealloc
    {
        [_textField release];
        [super dealloc];
    }
    - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
    {
        self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
        if (self) {
            // Custom initialization
        }
        return self;
    }
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
        self.view.backgroundColor = [UIColor orangeColor];
        self.navigationItem.title = @"第二页";
      
        
        
        _textField = [[UITextField alloc]initWithFrame:CGRectMake(50, 80, 200, 30)];
        _textField.borderStyle = UITextBorderStyleRoundedRect;
        [self.view addSubview:_textField];
        
        
        
        
        UIButton * button = [UIButton systemButtonWithFrame:CGRectMake(100, 120, 50, 50) title:@"Back" target:self action:@selector(didClickButtonAction)];
        [self.view addSubview:button];
     
        
        
        
        
    	// Do any additional setup after loading the view.
    }
    
    - (void)didClickButtonAction
    {
        [_target performSelector:_action withObject:_textField.text];
        [self.navigationController popToRootViewControllerAnimated:YES];
    }
    
    
    
    - (void)didReceiveMemoryWarning
    {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    @end
    




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  • 原文地址:https://www.cnblogs.com/mfrbuaa/p/4043672.html
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