View 与 Controller 之间的delegate(代理)传值

这个代理传值是经常使用的一种传值方式，下面介绍一种View 和 Controller 之间的代理传值方法。

先建立一个View视图

如 LoginView 是继承于一个UIView

在LoginView.h里面声明协议

LoginView.h文件

   #import <UIKit/UIKit.h>

@class LoginView;

//1.声明协议

@protocol LoginViewDelegate

@optional//可选的

• (void)sureButtonTaped:(LoginView *)loginView info:(NSString *)info;
  
  @end
  
  @interface LoginView : UIView
  
  //2.声明delegate属性
  
  @property (nonatomic,assign) id delegate;
  
  @end

在LoginView.m 有一个textField,一个button，点击button,将textField里面的值传入Controller里面。

LoginView.m文件

import "LoginView.h"

@interface LoginView ()

@property (nonatomic,strong)UITextField *textField;

@property (nonatomic,strong) UIButton *button;

@end

@implementation LoginView

• (instancetype)initWithFrame:(CGRect)frame
  
  {
  
  self = [super initWithFrame:frame];
  
  if (self) {
  
  self.backgroundColor = [UIColor yellowColor];

    [self setUp];
  

  }
  
  return self;
  
  }

• (void)setUp{

  _textField = [[UITextField alloc] init];
  
  _textField.bounds = CGRectMake(0, 0, CGRectGetWidth(self.bounds) * 0.7, 40);
  
  _textField.center = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds) - 100);
  
  _textField.tintColor = [UIColor redColor];
  
  _textField.borderStyle = UITextBorderStyleLine;
  
  _textField.keyboardType = UIKeyboardTypeASCIICapable;
  
  _textField.placeholder = @"请输入文字";
  
  _textField.clearButtonMode = UITextFieldViewModeWhileEditing;
  
  [self addSubview:_textField];

  _button = [UIButton buttonWithType:UIButtonTypeSystem];
  
  _button.frame = CGRectMake(120, 280, 80, 30);
  
  [_button setTitle:@"登陆" forState:UIControlStateNormal];
  
  [_button addTarget:self action:@selector(buttonTaped:) forControlEvents:UIControlEventTouchUpInside];
  
  [self addSubview:_button];

}

• (void)buttonTaped:(UIButton *)sender
  
  {
  
  //调用协议方法
  
  [_delegate sureButtonTaped:self info:_textField.text];

}

在这里我们用于接收的视图就用一开始的ViewController,你也可以传入你想要传入的视图

ViewController.h文件

import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

ViewController.m文件

#import "ViewController.h"

#import "LoginView.h"

//引入协议

@interface ViewController ()

@end

@implementation ViewController

• (void)viewDidLoad {
  
  [super viewDidLoad];
  
  LoginView *login = [[LoginView alloc]initWithFrame:CGRectMake(20, 200, 375-40, 350)];
  
  //1.设置代理
  
  login.delegate = self;
  
  [self.view addSubview:login];

}

#pragma mark -- LoginViewDelegate

//3.实现协议方法

• (void)sureButtonTaped:(LoginView *)loginView info:(NSString *)info
  
  {

  NSLog(@"%@",info);

}

• (void)didReceiveMemoryWarning {
  
  [super didReceiveMemoryWarning];
  
  // Dispose of any resources that can be recreated.
  
  }

@end

总结：代理加方法的传值是一种很好的传值方式，我们可以将自己要传入的值写进方法里面，打包传入，方便快捷。。