View 与 Controller 之间的delegate(代理)传值

2024-04-03 05:44:51

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。。

最新文章

热门文章