【IOS】利用ASIHTTPRequest 实现一个简单的登陆验证

[b]【[/b]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 [cpp] view plaincopy //
// 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
[cpp] view plaincopy //
// 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] view plaincopy <?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"}';
};
?>