微信已經深入到每一個APP的縫隙,最常用的莫過分享和登錄了,接下來就以代碼的形式來展開微信登錄的相關說明,至於原理級別的oauth2.0認證體系請參考微信開放平臺的相關說明和圖示 https://open.weixin.qq.com/
微信登錄授權開發
1,到微信開發平臺註冊相關APP,現在是等待審覈成功後才能獲取到對應的key和secret;獲取成功後需要單獨申請開通登錄和支付接口,如圖
2,和QQ類似,需要填寫Url Schemes,如demo中的wxd930ea5d5a258f4f ,然後引入相應framework;
3,在AppDelegate中註冊和實現授權後的回調函數,代碼如下:
//向微信註冊
[WXApi registerApp:kWXAPP_ID withDescription:@"weixin"];
//授權後回調 WXApiDelegate
-(void)onResp:(BaseReq *)resp
{
/*
ErrCode ERR_OK = 0(用戶同意)
ERR_AUTH_DENIED = -4(用戶拒絕授權)
ERR_USER_CANCEL = -2(用戶取消)
code 用戶換取access_token的code,僅在ErrCode爲0時有效
state 第三方程序發送時用來標識其請求的唯一性的標誌,由第三方程序調用sendReq時傳入,由微信終端回傳,state字符串長度不能超過1K
lang 微信客戶端當前語言
country 微信用戶當前國家信息
*/
SendAuthResp *aresp = (SendAuthResp *)resp;
if (aresp.errCode== 0) {
NSString *code = aresp.code;
NSDictionary *dic = @{@"code":code};
}
}
//和QQ,新浪並列回調句柄
- (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,微信登錄授權比較複雜,相比QQ,新浪多了幾步,簡單說就是需要三步,第一步,獲取code,這個用來獲取token,第二步,就是帶上code獲取token,第三步,根據第二步獲取的token和openid來獲取用戶的相關信息;
下面用代碼來實現:
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];
}
這裏獲取後會調用之前在AppDelegate裏面的對應oauthResp回調,獲得得到的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來獲取對應的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"]]]];
}
});
});
}
執行到這一步就算完成了整個授權登錄的功能,能把暱稱和頭像顯示出來,剩下的就是及時刷新你的token,詳情可參考開發文檔。
下面是登錄成功後的QQ,新浪微博,微信的真機運行成功截圖:
評價:微信的開發文檔相比容易理解和調試,雖然沒有demo,但是文檔比較詳細,所以可以在一定程度上減輕了開發的困難,但是相比之下微信的授權步驟比較麻煩,需要三步才能徹底獲取用戶信息,這點沒有QQ和新浪微博簡潔,需要有一定的閱讀和代碼功底,希望能給大家帶來幫助。
更多iOS瘋狂詳解:http://blog.csdn.net/wanglongblog