iOS 第三方登陆 —— 微信

一、准备工作
1、到微信开放平台注册成开发者，获取appid
2、导入WeChatConnection.framework
3、配置URL Schemes  输入appid  例如wx29ce0f21ea982cb8
二、配置AppDelegate.m
1、 注册微信

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//微信登陆  

[WXApi registerApp:WeiXin_AppId withDescription:@"weixin"];  

2、设置函数
//把代理设置到登陆视图中

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- (BOOL)application:(UIApplication *)application  

      handleOpenURL:(NSURL *)url  

{  

    return [WXApi handleOpenURL:url delegate:[LoginViewController shareLogin]];  

}  

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- (BOOL)application:(UIApplication *)application  

            openURL:(NSURL *)url  

  sourceApplication:(NSString *)sourceApplication  

         annotation:(id)annotation  

{  

    return [WXApi handleOpenURL:url delegate:[LoginViewController shareLogin]];  

}  

三、登陆页代码
1、微信登录授权比较复杂，相比QQ，新浪多了几步，简单说就是需要三步，第一步，获取code，这个用来获取token，第二步，就是带上code获取token，第三步，根据第二步获取的token和openid来获取用户的相关信息
2、第一步：获取code

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-(void)weiXinLogin  

{  

    SendAuthReq* req =[[SendAuthReq alloc] init];  

    req.scope = @"snsapi_userinfo,snsapi_base";  

    req.state = @"0744" ;  

    [WXApi sendReq:req];  

}  

  

-(void)onReq:(BaseReq *)req  

{  

    NSLog(@"呵呵");  

    [self msgHint:@"登陆失败"];  

}  

  

-(void)onResp:(BaseResp *)resp  

{  

    SendAuthResp* sender = (SendAuthResp*)resp;  

    NSString* code = sender.code;  

    NSLog(@"啦啦 code = %@",code);  

      

    MBProgressHUD * hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];  

    hud.labelText = @"收取用户信息..";  

    [self getAccess_tokenWithCode:code];  

}  

第二步 获取token

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-(void)getAccess_tokenWithCode:(NSString*)myCode  

{  

    //https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code  

      

    NSString *url =[NSString stringWithFormat:@"https://api.weixin.qq.com/sns/oauth2/access_token?appid=%@&secret=%@&code=%@&grant_type=authorization_code",kWXAPP_ID,kWXAPP_SECRET,myCode];  

      

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{  

        NSURL *zoneUrl = [NSURL URLWithString:url];  

        NSString *zoneStr = [NSString stringWithContentsOfURL:zoneUrl encoding:NSUTF8StringEncoding error:nil];  

        NSData *data = [zoneStr dataUsingEncoding:NSUTF8StringEncoding];  

        dispatch_async(dispatch_get_main_queue(), ^{  

            if (data) {  

                NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];  

                NSString* token = [dic objectForKey:@"access_token"];  

                NSString* openid = [dic objectForKey:@"openid"];  

                [self getUserInfoWithToken:token openId:openid];  

                NSLog(@"token = %@",token);  

                NSLog(@"openid = %@",openid);  

                  

                  

            }  

        });  

    });  

}  

第三步：获取用户信息

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-(void)getUserInfoWithToken:(NSString*)myToken openId:(NSString*)myOpenId  

{  

    // https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID  

      

    NSString *url =[NSString stringWithFormat:@"https://api.weixin.qq.com/sns/userinfo?access_token=%@&openid=%@",myToken,myOpenId];  

    NSLog(@"infoUrl = %@",url);  

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{  

        NSURL *zoneUrl = [NSURL URLWithString:url];  

        NSString *zoneStr = [NSString stringWithContentsOfURL:zoneUrl encoding:NSUTF8StringEncoding error:nil];  

        NSData *data = [zoneStr dataUsingEncoding:NSUTF8StringEncoding];  

        dispatch_async(dispatch_get_main_queue(), ^{  

            if (data) {  

                NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];  

                NSString* nickName = [dic objectForKey:@"nickname"];  

                NSString* wxHeadImgUrl = [dic objectForKey:@"headimgurl"];  

                  

                NSLog(@"nickName = %@",nickName);  

                NSLog(@"headImg = %@",wxHeadImgUrl);  

                  

                NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];  

                [userDefaults setObject:ON forKey:LogState];  

                [userDefaults setObject:ThirdFoudationLogin forKey:LogType];  

                [userDefaults setObject:nickName forKey:LoginName];  

                [userDefaults setObject:wxHeadImgUrl forKey:UserHeaderPath];  

                [userDefaults synchronize];  

                  

                [MBProgressHUD hideAllHUDsForView:self.view animated:YES];  

                [self msgHint:@"微信登陆成功"];  

                [self popView];  

            }  

        });  

          

    });  

}