NSURLConnection(登录案例)

案例步骤:

1> 搭建基本UI界面
2> 监听用户textFiled的EditingChanged

 [self.nameText addTarget:self action:@selector(name:) forControlEvents:UIControlEventEditingChanged];
 [self.pwdText addTarget:self action:@selector(pwd:) forControlEvents:UIControlEventEditingChanged];

3> 将用户的信息添加到请求中,使用的是POST请求,(这里面这涉及到connection的基本操作)
4> 使用connection发送异步请求
5> 在异步请求中的block回调中拿到服务器响应的数据判断是否登录成功
6> 处理自动登录业务

• 监听switch的点击,获取switch.on保存到用户的偏好设置里面
• 注意:(在保存Switch.on为yes的情况下)登录成功的同时保存用户数据到沙盒中,如果登录是失败的,但是用户的switch.on也为yes的话,我们要把沙盒中的switch.on数据写为no
• 在viewDidLoad中取出沙盒中的数据,判断是否为自动登录,如果是直接取出沙盒中的数据赋给我们的textField;

案例代码

- (void)viewDidLoad
{
    [self.nameText addTarget:self action:@selector(name:) forControlEvents:UIControlEventEditingChanged];
    [self.pwdText addTarget:self action:@selector(pwd:) forControlEvents:UIControlEventEditingChanged];
    //从沙盒中取出来
    self.outoLogin.on = [self.defaults boolForKey:@"outoLogin"];
//    NSLog(@"%bool",[defaults objectForKey:@"outoLogin"]);
    if (self.outoLogin.isOn) {
        NSString *userName = [self.defaults objectForKey:@"userName"];
        NSString *pwd = [self.defaults objectForKey:@"pwd"];
        self.nameText.text = userName;
        self.pwdText.text = pwd;
    }
    
}
- (IBAction)outoLogin:(UISwitch *)sender {
    [self.defaults setBool:sender.on forKey:@"outoLogin"];
}


- (NSUserDefaults *)defaults
{
    if (_defaults == nil) {
        _defaults = [NSUserDefaults standardUserDefaults];
    }
    return _defaults;
}


- (IBAction)loginBtn:(id)sender {
//    if (self.nameText.text.length == 0) {
//        [SVProgressHUD showInfoWithStatus:@"请输入姓名"];
//    }
//    if (self.pwdText.text.length == 0) {
//        [SVProgressHUD showInfoWithStatus:@"请输入密码"];
//    }
    if (self.nameText.text.length != 0 && self.pwdText.text.length != 0) {
        [self login];
    }else
    {
        [SVProgressHUD showInfoWithStatus:@"请输入姓名或密码"];
    }
    
}

- (void)login
{
    [SVProgressHUD showWithStatus:@"正在登录" maskType:SVProgressHUDMaskTypeBlack];
    NSLog(@"login");
    //1.创建url
    NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    
    NSString *userName = self.nameText.text;
    //转码
    //    userName = [userName stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSString *pwd = self.pwdText.text;
    NSLog(@"%@_%@",userName,pwd);
    request.HTTPMethod = @"POST";
    NSString *bodyStr =  [NSString stringWithFormat:@"username=%@&pwd=%@",userName, pwd];
    request.HTTPBody = [bodyStr dataUsingEncoding:NSUTF8StringEncoding];
    
    [NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc]init] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
        //回调block
        NSString *dataStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
        
        //截取字符串(判断是否登录成功)
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            if ([dataStr containsString:@"error"]) {
                [SVProgressHUD showErrorWithStatus:@"登录失败,请核对账号密码" maskType:SVProgressHUDMaskTypeBlack];
                if (self.outoLogin.on) {
                    [self.defaults setBool:NO forKey:@"outoLogin"];
                }
            }else
            {
                [SVProgressHUD showSuccessWithStatus:@"登录成功" maskType:SVProgressHUDMaskTypeBlack];
                //判断是witch的状态
                if (self.outoLogin.on) {
                    [self.defaults setValue:userName forKey:@"userName"];
                    [self.defaults setValue:pwd forKey:@"pwd"];
                }
                
            }

        });
    }];
    
    

}

#pragma mark - NSURLConnectionDataDelegate
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    NSLog(@"__");
}

//监听textFiled
- (void)name:(UITextField *)name
{
    self.nameText.text = name.text;
//    NSLog(@"%@",name.text);
}

- (void)pwd:(UITextField *)pwd
{
    self.pwdText.text = pwd.text;
//    NSLog(@"%@",pwd.text);
}

• Posted by 简书.lovepeijun