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：
//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
- (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
-(void)getAccess_token
{
//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,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
-(void)getUserInfo
{
// 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=%@",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。
作者：蔡哲永
如果问题，请加QQ850270358，备注写解决问题，和我单独沟通哦。