View 與 Controller 之間的delegate(代理)傳值

這個代理傳值是經常使用的一種傳值方式，下麵介紹一種View 和 Controller 之間的代理傳值方法。
先建立一個View視圖
如 LoginView 是繼承於一個UIView
在LoginView.h裡面聲明協議
LoginView.h文件

   #import <UIKit/UIKit.h>

@class LoginView;
//1.聲明協議
@protocol LoginViewDelegate
@optional//可選的

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

在LoginView.m 有一個textField,一個button，點擊button,將textField裡面的值傳入Controller裡面。
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 = @"請輸入文字";
  _textField.clearButtonMode = UITextFieldViewModeWhileEditing;
  [self addSubview:_textField];

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

}

• (void)buttonTaped:(UIButton *)sender
  {
  //調用協議方法
  [_delegate sureButtonTaped:self info:_textField.text];

}

在這裡我們用於接收的視圖就用一開始的ViewController,你也可以傳入你想要傳入的視圖

ViewController.h文件

#import
@interface ViewController : UIViewController
@end

ViewController.m文件
#import "ViewController.h"
#import "LoginView.h"
//引入協議

@interface ViewController ()

@end

@implementation ViewController

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

}
#pragma mark -- LoginViewDelegate
//3.實現協議方法

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

  NSLog(@"%@",info);

}

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

@end

總結：代理加方法的傳值是一種很好的傳值方式，我們可以將自己要傳入的值寫進方法裡面，打包傳入，方便快捷。。