【IOS】利用ASIHTTPRequest 实现一个简单的登陆验证

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    原文地址：http://blog.youkuaiyun.com/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];
	
    //输出接收到的字符串
    NSString *str = [NSString stringWithUTF8String:[data bytes]];
    NSLog(@"%@",str);
    //判断是否登陆成功
    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"}';
	};
?>