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 。
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。