【IOS】利用ASIHTTPRequest 实现一个简单的登陆验证

【原文地址：http://blog.csdn.net/toss156/article/details/7638529】

今天给大家带来一个简单的登陆验证，用的是ASIHttpRequest 这个开源类库，使用的方法很简单，从网上下载下来以后，添加到项目中，并添加一下这些框架。

下面上代码

 //
 //  ViewController.h
 //  NetDemo
 //
 //  Created by zhouhaifeng on 12-6-6.
 //  Copyright (c) 2012年 zhouhaifeng. All rights reserved.
 //

 #import <UIKit/UIKit.h>
 #import "ASIHttpHeaders.h"
 #import "CJSONDeserializer.h"
 #import "tooles.h"
 @interface ViewController : UIViewController<ASIHTTPRequestDelegate>
 {
     UITextField *username;
     UITextField *password;

 }
 @property (nonatomic,retain) UITextField *username;
 @property (nonatomic,retain) UITextField *password;

 @end

 //
 //  ViewController.m
 //  NetDemo
 //
 //  Created by zhouhaifeng on 12-6-6.
 //  Copyright (c) 2012年 zhouhaifeng. All rights reserved.
 //

 #import "ViewController.h"
 #define HOSTURL @"http://192.168.1.105/NetDemo/index.php";


 @interface ViewController ()
 -(void) login:(id)sender;
 -(void) GetErr:(ASIHTTPRequest *)request;
 -(void) GetResult:(ASIHTTPRequest *)request;
 @end

 @implementation ViewController
 @synthesize username,password;
 - (void)viewDidLoad
 {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.
     UILabel *txt1 = [[UILabel alloc] initWithFrame:CGRectMake(30,100,70,30)];
     [txt1 setText:@"用户名"];
     [txt1 setBackgroundColor:[UIColor clearColor]];
     [self.view addSubview:txt1];

     UILabel *txt2 = [[UILabel alloc] initWithFrame:CGRectMake(30,140,70,30)];
     [txt2 setText:@"密   码"];
     [txt2 setBackgroundColor:[UIColor clearColor]];
     [self.view addSubview:txt2];

     username = [[UITextField alloc]initWithFrame:CGRectMake(120,100, 150, 30)];
     [username setBorderStyle:UITextBorderStyleRoundedRect];
     [self.view addSubview:username];

     password = [[UITextField alloc]initWithFrame:CGRectMake(120,140, 150, 30)];
     [password setBorderStyle:UITextBorderStyleRoundedRect];
     [password setSecureTextEntry:YES];
     [self.view addSubview:password];

     UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
     [btn setTitle:@"提交" forState:UIControlStateNormal];
     [btn addTarget:self action:@selector(login:) forControlEvents:UIControlEventTouchUpInside];
     [btn setFrame:CGRectMake(90, 180, 150, 40)];
     [self.view addSubview:btn];



 }

 -(void) login:(id)sender
 {
     //表单提交前的验证
     if (username.text == nil||password.text==nil ) {
         [tooles MsgBox:@"用户名或密码不能为空！"];
         return;
     }
     //隐藏键盘
     [username resignFirstResponder];
     [password resignFirstResponder];
     //
     [tooles showHUD:@"正在登陆...."];
     NSString *urlstr = HOSTURL;
     NSURL *myurl = [NSURL URLWithString:urlstr];
     ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:myurl];
     //设置表单提交项
     [request setPostValue:username.text forKey:@"username"];
     [request setPostValue:username.text forKey:@"password"];
     [request setDelegate:self];
     [request setDidFinishSelector:@selector(GetResult:)];
     [request setDidFailSelector:@selector(GetErr:)];
     [request startAsynchronous];


 }

    //获取请求结果
 - (void)GetResult:(ASIHTTPRequest *)request{

     [tooles removeHUD];
     NSData *data =[request responseData];
     NSDictionary *dictionary = [[CJSONDeserializer deserializer] deserializeAsDictionary:data error:nil];
     <p class="p1"><span class="s1">    </span><span class="s2">//</span>输出接收到的字符串</p><p class="p2"><span class="s4">    NSString</span><span class="s3"> *str = [</span><span class="s4">NSString</span><span class="s3"> </span>stringWithUTF8String<span class="s3">:[data </span>bytes<span class="s3">]];</span></p><p class="p3">    <span class="s5">NSLog</span>(<span class="s6">@"%@"</span>,str);</p><p class="p1"><span class="s1">    </span><span class="s2">//</span>判断是否登陆成功</p>
     if ([dictionary objectForKey:@"yes"]) {
         [tooles MsgBox:[dictionary objectForKey:@"yes"]];
         return;
     }else if ([dictionary objectForKey:@"error"] != [NSNull null]) {
         [tooles MsgBox:[dictionary objectForKey:@"error"]];
         return;
     }

 }

   //连接错误调用这个函数
 - (void) GetErr:(ASIHTTPRequest *)request{

     [tooles removeHUD];

     [tooles MsgBox:@"网络错误,连接不到服务器"];
 }

 - (void)viewDidUnload
 {
     [super viewDidUnload];
     // Release any retained subviews of the main view.
 }

 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
 {
     return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
 }

 -(void) dealloc
 {
     [username release];
     [password release];
     [super dealloc];
 }

 @end

php端验证的代码，随便写了下，后面就是返回一个JSON格式的字符串。

 <?php
     if($_POST['username'] == "admin" &&  $_POST['password'] == "admin")
     {
         echo '{"yes":"登陆成功"}';
     }else
     {
         echo '{"error":"用户名或密码错误"}';
     };
 ?>