【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.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];
    //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。

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