微信登录

首先得获取kWeiXinAppSecret和kWeiXinAppId两个参数；
这两个参数都是在微信里面有体现的；

在项目中导入依赖库：

添加iOS9 URL Schemes.

添加URL Types

Appdelegate部分代码如下：
导入类#import “WXApi.h”
导入类#import “WXApiHan.h”
挂上代理：WXApiDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    root = [[ViewController alloc]init];    self.window.rootViewController = root;    [WXApi registerApp:@"wx********" withDescription:@"***************"];//        [WXApi registerApp:kWeiXinAppId withDescription:kAppDescription];    return YES;}- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {    return  [WXApi handleOpenURL:url delegate:[WXApiHan sharedManager]];}- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {    return [WXApi handleOpenURL:url delegate:[WXApiHan sharedManager]];}- (void)onReq:(BaseReq*)req {     /*         onReq是微信终端向第三方程序发起请求，要求第三方程序响应。第三方程序响应完后必须调用sendRsp返回。在调用sendRsp返回时，会切回到微信终端程序界面。             */}需要放在一个继承NSObject的类里面实现（WXApiHan.m）+(instancetype)sharedManager {    static dispatch_once_t onceToken;    static WXApiHan *instance;    dispatch_once(&onceToken, ^{        instance = [[WXApiHan alloc] init];    });    return instance;}#pragma mark - WXApiDelegate- (void)onResp:(BaseResp *)resp {    NSLog(@"%d",resp.errCode);    /*          如果第三方程序向微信发送了sendReq的请求，那么onResp会被回调。sendReq请求调用后，会切到微信终端程序界面。           */    if (resp.errCode == 0)     {         NSLog(@"用户同意");         SendAuthResp *aresp = (SendAuthResp *)resp;         [self getAccessTokenWithCode:aresp.code];     }else if (resp.errCode == -4){         NSLog(@"用户拒绝");     }else if (resp.errCode == -2){         NSLog(@"用户取消");     }}

最后在发出请求授权，代码如下：

使用js调用OC方法授权-(void)webViewDidFinishLoad:(UIWebView *)webView{    JSContext *context = [self.WebViewChat valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];    context[@"wxLogin"] = ^() {        NSArray *args = [JSContext currentArguments];        for (id obj in args) {        //当OC调用JS的方法和JS调用OC的方法名一致时会出现循环调用            NSLog(@"重复调用%@",obj);        }        SendAuthReq* req =[[SendAuthReq alloc ] init];        req.scope = @"snsapi_userinfo" ;        req.state = @"123" ;        req.state = kAppDescription;        //第三方向微信终端发送一个SendAuthReq消息结构        [WXApi sendReq:req];        //使用通知进行传值[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(WetchatNot:) name:@"not" object:nil];    };    }//直接触发授权- (void)sendAuthRequest{    //构造SendAuthReq结构体    SendAuthReq* req =[[SendAuthReq alloc ] init];    req.scope = @"snsapi_userinfo" ;    req.state = @"123" ;    //第三方向微信终端发送一个SendAuthReq消息结构    [WXApi sendReq:req];}

使用通知传值的，并且使用OC调用JS的代码如下

- (void)WetchatNot:(NSNotification *)not{    NSDictionary *Dic = not.userInfo;    if (Dic.count != 0) {        JSContext *context = [self.WebViewChat valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];        NSString *js = [NSString stringWithFormat:@"wxLogin2('%@','%@');",Dic[@"unionid"],Dic[@"nickname"]];        [context evaluateScript:js];        /*         [self.WebViewChat stringByEvaluatingJavaScriptFromString:js];         NSString *alertJS=@"alert('test js OC')"; //准备执行的js代码         [context evaluateScript:alertJS];//通过oc方法调用js的alert         */        NSLog(@"jsjs:%@",js);    }}

// 授权后回调在WXApiHan里面进行处理

// WXApiHan.m#pragma mark - LifeCycle+(instancetype)sharedManager {    static dispatch_once_t onceToken;    static WXApiHan *instance;    dispatch_once(&onceToken, ^{        instance = [[WXApiHan alloc] init];    });    return instance;}#pragma mark - WXApiDelegate- (void)onResp:(BaseResp *)resp {    NSLog(@"%d",resp.errCode);    if (resp.errCode == 0)     {         NSLog(@"用户同意");         SendAuthResp *aresp = (SendAuthResp *)resp;         [self getAccessTokenWithCode:aresp.code];     }else if (resp.errCode == -4){         NSLog(@"用户拒绝");     }else if (resp.errCode == -2){         NSLog(@"用户取消");     }}- (void)getAccessTokenWithCode:(NSString *)code{     NSString *urlString =[NSString stringWithFormat:@"https://api.weixin.qq.com/sns/oauth2/access_token?appid=%@&secret=%@&code=%@&grant_type=authorization_code",kWeiXinAppId,kWeiXinAppSecret,code];     NSURL *url = [NSURL URLWithString:urlString];     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{         NSString *dataStr = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];         NSData *data = [dataStr dataUsingEncoding:NSUTF8StringEncoding];         dispatch_async(dispatch_get_main_queue(), ^{             if (data)             {                 NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];//                 NSLog(@"%@",dict);                 if ([dict objectForKey:@"errcode"])                 {                     NSLog(@"%@",dict); //获取token错误                 }else{                     /*                      {                      "access_token" = "tnSXfzh2w8zrDe8zCdi0m1ZmOR***************Ckz6S6xJLQFeUDgu5Hyhwyowg5fvOhW2ZpA7Rr_PGPPO8P1Sw";                      "expires_in" = 7200;                      openid = oKiGKvxz***************JEjaYTNZPmA6OU;                      "refresh_token" = "piHYgVqYxjw8mGdS1Wrnq8bIihijEp_Tvz6K***************jveI4iv5MPvOyV9zIemT_YAzv5S9djY";                      scope = "snsapi_userinfo";                      unionid = "o6awM***************aYlc***************ft9-A";                      }                      */ //存储AccessToken OpenId RefreshToken以便下次直接登陆 //AccessToken有效期两小时，RefreshToken有效期三十天                     [self getUserInfoWithAccessToken:[dict objectForKey:@"access_token"] andOpenId:[dict objectForKey:@"openid"]];                 }             }         });     });     /*                  正确返回                  "access_token" = “Oez*****8Q";                  "expires_in" = 7200;                  openid = ooVLKjppt7****p5cI;                  "refresh_token" = “Oez*****smAM-g";                  scope = "snsapi_userinfo";                  */     /*                  错误返回                  errcode = 40029;                  errmsg = "invalid code";                  */ }//使用AccessToken获取用户信息- (void)getUserInfoWithAccessToken:(NSString *)accessToken andOpenId:(NSString *)openId{     NSString *urlString =[NSString stringWithFormat:@"https://api.weixin.qq.com/sns/userinfo?access_token=%@&openid=%@",accessToken,openId];     NSURL *url = [NSURL URLWithString:urlString];     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{         NSString *dataStr = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];        NSData *data = [dataStr dataUsingEncoding:NSUTF8StringEncoding];         dispatch_async(dispatch_get_main_queue(), ^{             if (data)             {                 NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];                 if ([dict objectForKey:@"errcode"])                 { //AccessToken失效                     [self getAccessTokenWithRefreshToken:[[NSUserDefaults standardUserDefaults]objectForKey:kWeiXinRefreshToken]];                 }else{                     /*                      {                      city = ***************;                      country = CN;                      headimgurl = "http://wx.qlogo.cn/mmopen/aHc3T6Vicag75TPSvsvesibnSQSy6NicDlg1vJVPfvPf34n0ccsYmIKKKEVN9W6mgxq22eH7XInjqGqW64KtFHwaAyD9WY59nnG/0";                      language = "zh_CN";                      nickname = "\U91d1\U826f\U5e73";                      openid = ****************A6OU;                      privilege =     (                      );                      province = ***************;                      sex = 1;                      unionid = "***************-A";                      }                      */ //获取需要的数据                     NSLog(@"dictdict%@",dict);                     [[NSNotificationCenter defaultCenter]postNotificationName:@"not" object:nil userInfo:dict];                }             }         });     });  /*               city = ****;               country = CN;               headimgurl = "http://wx.qlogo.cn/mmopen/q9UTH59ty0K1PRvIQkyydYMia4xN3gib2m2FGh0tiaMZrPS9t4yPJFKedOt5gDFUvM6GusdNGWOJVEqGcSsZjdQGKYm9gr60hibd/0";                language = "zh_CN";                nickname = “****";                openid = oo*********;               privilege =     (                );                province = *****;                sex = 1;                unionid = “o7VbZjg***JrExs";                */    /*                  错误代码                  errcode = 42001;                  errmsg = "access_token expired";                  */ }- (void)getAccessTokenWithRefreshToken:(NSString *)refreshToken {        NSString *urlString =[NSString stringWithFormat:@"https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=%@&grant_type=refresh_token&refresh_token=%@",kWeiXinAppId,refreshToken];        NSURL *url = [NSURL URLWithString:urlString];        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{NSString *dataStr = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];                 NSData *data = [dataStr dataUsingEncoding:NSUTF8StringEncoding];                dispatch_async(dispatch_get_main_queue(), ^{                         if (data)                             {                                     NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];                                    if ([dict objectForKey:@"errcode"])                                         {                             //授权过期                                             }else{                                 //重新使用AccessToken获取信息                                               }                                 }                    });            });       /*                  "access_token" = “Oez****5tXA";                  "expires_in" = 7200;                  openid = ooV****p5cI;                  "refresh_token" = “Oez****QNFLcA";                  scope = "snsapi_userinfo,";                  */      /*         错误代码         "errcode":40030,         "errmsg":"invalid refresh_token"      */ }

// AppDelegate.m// 获取用户个人信息（UnionID机制）- (void)wechatLoginByRequestForUserInfo {  AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];  NSString *accessToken = [[NSUserDefaults standardUserDefaults] objectForKey:WX_ACCESS_TOKEN];  NSString *openID = [[NSUserDefaults standardUserDefaults] objectForKey:WX_OPEN_ID];  NSString *userUrlStr = [NSString stringWithFormat:@"%@/userinfo?access_token=%@&openid=%@", WX_BASE_URL, accessToken, openID];  // 请求用户数据  [manager GET:userUrlStr parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {    NSLog(@"请求用户信息的response = %@", responseObject);    // NSMutableDictionary *userDict = [NSMutableDictionary dictionaryWithDictionary:responseObject];  } failure:^(AFHTTPRequestOperation *operation, NSError *error) {    NSLog(@"获取用户信息时出错 = %@", error);  }];}

在使用调用微信授权时，如果出现输入手机号码进行登录的话，那就是白名单的设置问题：可查看，也可在Umeng上面查看，并且添加自己需要的。

微信SDK下载地址：https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list&t=resource/res_list&verify=1&id=open1419319164&token=&lang=zh_CN