基于第三方微信授权登录的iOS代码分析
http://www.cocoachina.com/ios/20140922/9715.html
微信已经深入到每一个APP的缝隙,最常用的莫过分享和登录了,接下来就以代码的形式来展开微信登录的相关说明,至于原理级别的oauth2.0认证体系请参考微信开放平台的相关说明和图示 https://open.weixin.qq.com/
微信登录授权开发
1,到微信开发平台注册相关APP,现在是等待审核成功后才能获取到对应的key和secret;获取成功后需要单独申请开通登录和支付接口,如图
2,和QQ类似,需要填写Url Schemes,如demo中的wxd930ea5d5a258f4f ,然后引入相应framework;
3,在AppDelegate中注册和实现授权后的回调函数,代码如下:
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//向微信注册 [WXApi registerApp:kWXAPP_ID withDescription:@ "weixin" ]; //授权后回调 WXApiDelegate -(void)onResp:(BaseReq *)resp { /* ErrCode ERR_OK = 0(用户同意) ERR_AUTH_DENIED = -4(用户拒绝授权) ERR_USER_CANCEL = -2(用户取消) code 用户换取access_token的code,仅在ErrCode为0时有效 state 第三方程序发送时用来标识其请求的唯一性的标志,由第三方程序调用sendReq时传入,由微信终端回传,state字符串长度不能超过1K lang 微信客户端当前语言 country 微信用户当前国家信息 */ SendAuthResp *aresp = (SendAuthResp *)resp; if (aresp.errCode== 0) { NSString *code = aresp.code; NSDictionary *dic = @{@ "code" :code}; } } //和QQ,新浪并列回调句柄 - (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation { return [TencentOAuth HandleOpenURL:url] || [WeiboSDK handleOpenURL:url delegate:self] || [WXApi handleOpenURL:url delegate:self];; } - (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url { return [TencentOAuth HandleOpenURL:url] || [WeiboSDK handleOpenURL:url delegate:self] || [WXApi handleOpenURL:url delegate:self];; } |
4,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;
下面用代码来实现:
第一步:code
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- (IBAction)weixinLogin:(id)sender { [self sendAuthRequest]; } -(void)sendAuthRequest { SendAuthReq* req =[[SendAuthReq alloc ] init]; req.scope = @ "snsapi_userinfo,snsapi_base" ; req.state = @ "0744" ; [WXApi sendReq:req]; } |
这里获取后会调用之前在AppDelegate里面的对应oauthResp回调,获得得到的code。
第二步:token和openid
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-(void)getAccess_token { NSString *url =[NSString stringWithFormat:@ "https://api.weixin.qq.com/sns/oauth2/access_token?appid=%@&secret=%@&code=%@&grant_type=authorization_code" ,kWXAPP_ID,kWXAPP_SECRET,self.wxCode.text]; 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]; /* { "access_token" = "OezXcEiiBSKSxW0eoylIeJDUKD6z6dmr42JANLPjNN7Kaf3e4GZ2OncrCfiKnGWiusJMZwzQU8kXcnT1hNs_ykAFDfDEuNp6waj-bDdepEzooL_k1vb7EQzhP8plTbD0AgR8zCRi1It3eNS7yRyd5A"; "expires_in" = 7200; openid = oyAaTjsDx7pl4Q42O3sDzDtA7gZs; "refresh_token" = "OezXcEiiBSKSxW0eoylIeJDUKD6z6dmr42JANLPjNN7Kaf3e4GZ2OncrCfiKnGWi2ZzH_XfVVxZbmha9oSFnKAhFsS0iyARkXCa7zPu4MqVRdwyb8J16V8cWw7oNIff0l-5F-4-GJwD8MopmjHXKiA"; scope = "snsapi_userinfo,snsapi_base"; } */ self.access_token.text = [dic objectForKey:@ "access_token" ]; self.openid.text = [dic objectForKey:@ "openid" ]; } }); }); } |
利用GCD来获取对应的token和openID.
第三步:userinfo
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-(void)getUserInfo { NSString *url =[NSString stringWithFormat:@ "https://api.weixin.qq.com/sns/userinfo?access_token=%@&openid=%@" ,self.access_token.text,self.openid.text]; 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]; /* { city = Haidian; country = CN; headimgurl = "http://wx.qlogo.cn/mmopen/FrdAUicrPIibcpGzxuD0kjfnvc2klwzQ62a1brlWq1sjNfWREia6W8Cf8kNCbErowsSUcGSIltXTqrhQgPEibYakpl5EokGMibMPU/0"; language = "zh_CN"; nickname = "xxx"; openid = oyAaTjsDx7pl4xxxxxxx; privilege = ( ); province = Beijing; sex = 1; unionid = oyAaTjsxxxxxxQ42O3xxxxxxs; } */ self.nickname.text = [dic objectForKey:@ "nickname" ]; self.wxHeadImg.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[dic objectForKey:@ "headimgurl" ]]]]; } }); }); } |
执行到这一步就算完成了整个授权登录的功能,能把昵称和头像显示出来,剩下的就是及时刷新你的token,详情可参考开发文档。
下面是登录成功后的QQ,新浪微博,微信的真机运行成功截图:
评价:微信的开发文档相比容易理解和调试,虽然没有demo,但是文档比较详细,所以可以在一定程度上减轻了开发的困难,但是相比之下微信的授权步骤比较麻 烦,需要三步才能彻底获取用户信息,这点没有QQ和新浪微博简洁,需要有一定的阅读和代码功底,希望能给大家带来帮助。