界面传值(协议)

最新推荐文章于 2025-01-11 18:53:11 发布

转载最新推荐文章于 2025-01-11 18:53:11 发布 · 302 阅读

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#界面传值-协议

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界面传值-协议

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本文介绍了一个iOS应用中通过界面传值实现页面间数据交互的方法，详细展示了如何利用Objective-C中的代理协议来完成从一个视图控制器到另一个视图控制器的数据传递。

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界面传值(协议)

import

import “SecondViewController.h”

@interface SecondViewController ()
@property(nonatomic,retain)UIButton *button;
@property(nonatomic,retain)UITextField *textField;

@end

@implementation SecondViewController

(void)dealloc
{
[_button release];
[_textField release];
[super dealloc];
}
(void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor=[UIColor yellowColor];

self.title=@”第二页”;

self.button=[UIButton buttonWithType:UIButtonTypeSystem];
self.button.frame=CGRectMake(100, 200, 175, 50);
self.button.backgroundColor=[UIColor whiteColor];
[self.view addSubview:self.button];
[self.button setTitle:@”返回” forState:UIControlStateNormal];
self.button.layer.borderWidth=1;
self.button.layer.cornerRadius=10;
[self.button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];

self.textField=[[UITextField alloc] initWithFrame:CGRectMake(100, 100, 175, 50)];
self.textField.backgroundColor=[UIColor redColor];
[self.view addSubview:self.textField];
[self.textField release];
self.textField.layer.borderWidth=1;
self.textField.layer.cornerRadius=10;

}
// 点击返回

// 协议的触发条件是点击按钮,所以在这里面进行协议传值的第三步
// 3.设置代理人执行的协议方法
-(void)click:(UIButton *)button{
[self.navigationController popViewControllerAnimated:YES];

[self.delegate changeValue:self.textField.text];

}

import “MainViewController.h”

import “SecondViewController.h”

// 4.签协议
@interface MainViewController ()
@property(nonatomic,retain)UILabel *label;
@property(nonatomic,retain)UIButton *button;

@end

@implementation MainViewController

(void)dealloc
{
[_label release];
[_button release];
[super dealloc];
}
(void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor=[UIColor redColor];
// 导航控制器的半透明变成不透明
self.navigationController.navigationBar.translucent=NO;

self.title=@”第一页”;

self.label=[[UILabel alloc] initWithFrame:CGRectMake(100, 100, 175, 50)];
self.label.backgroundColor=[UIColor yellowColor];
[self.view addSubview:self.label];
[self.label release];

self.button=[UIButton buttonWithType:UIButtonTypeSystem];
self.button.frame=CGRectMake(100, 200, 175, 50);
self.button.backgroundColor=[UIColor whiteColor];
[self.view addSubview:self.button];
[self.button setTitle:@”下一页” forState:UIControlStateNormal];
self.button.layer.borderWidth=1;
self.button.layer.cornerRadius=10;
[self.button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];

}

-(void)click:(UIButton *)button{
// push 下一页
SecondViewController *secVC=[[SecondViewController alloc] init];
// 5.设置代理人
secVC.delegate=self;
[self.navigationController pushViewController:secVC animated:YES];
[secVC release];
}

// 6.实现协议方法
-(void)changeValue:(NSString *)value{
self.label.text=value;
}