iOS微信授权

import "WXApi.h"

遵守协议

//注册appid

[WXApi registerApp:@"wxxxxxxxxxxxxx" withDescription:@"test"];

//调用
if ([WXApi isWXAppInstalled]) {
     SendAuthReq *req = [[SendAuthReq alloc] init];
     req.scope = @"snsapi_userinfo";
     req.state = @"meipian";
     [WXApi sendReq:req];
}else {
     UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"提示" message:@"请安装微信客户端" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
     [alert show];
}

//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;
        
        NSString *url = [NSString stringWithFormat:@"https://api.weixin.qq.com/sns/oauth2/access_token?appid=%@&secret=%@&code=%@&grant_type=authorization_code",@"wxxxxxxxxx",@"6df33aerd977aegewarr0ae1bc65a",code];
        
        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];
                    
                    //[dic objectForKey:@"access_token"];
                    NSString *openId = [dic objectForKey:@"openid"];
                    
                    NSString *url = [NSString stringWithFormat:@"https://api.weixin.qq.com/sns/userinfo?access_token=%@&openid=%@",[dic objectForKey:@"access_token"],openId];
                    
                    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];
                                //拿到openId，微信昵称，头像
                                NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithObjectsAndKeys:openId,@"wx_open_id",[dic objectForKey:@"nickname"],@"nickname",[dic objectForKey:@"headimgurl"],@"headImage", nil];
                            }
                        });
                    });
                }
            });
        });
    }
}