微信支付
在入口类里微信支付注册
    [WXApi registerApp:WeiXin_AppId withDescription:@"demo2.0"];
在入口类方法里添加url
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
      if ([[url scheme] isEqualToString:WeiXin_AppId])
    {
       return  [WXApi handleOpenURL:url delegate:self];
    }
}
支付回调
-(void)onResp:(BaseResp *)resp
{
    if([resp isKindOfClass:[PayResp class]]){
        switch (resp.errCode) {
            case WXSuccess:
                [self.narvigationController pushViewController:[[YDPayMoneySuccessViewController alloc]init] animated:YES];
                break;     
            default:
                [SVProgressHUD showView:self.window image:nil status:@"支付失败"];
                break;
        }
    }
}
发送微信支付请求
if ([WXApi isWXAppInstalled]) {
            
                    PayReq *weiXinReq = [[PayReq alloc]init];
                    weiXinReq.openID = WeiXin_AppId;
                    weiXinReq.partnerId = WeiXin_mchId;
                    weiXinReq.prepayId = self.balanceRespondEntity.backInfo.prepayId;
                    weiXinReq.package = @"Sign=WXPay";
                    weiXinReq.timeStamp = [self setTimeStamp];
                    weiXinReq.nonceStr = [WXUtil md5:[NSString stringWithFormat:@"%d",weiXinReq.timeStamp]];

                    //获取签名的方法，要注意
                    NSMutableDictionary *signParams = [NSMutableDictionary dictionary];
                    [signParams setObject: WeiXin_AppId          forKey:@"appid"];
                    [signParams setObject: weiXinReq.nonceStr    forKey:@"noncestr"];
                    [signParams setObject: weiXinReq.package     forKey:@"package"];
                    [signParams setObject: weiXinReq.partnerId   forKey:@"partnerid"];
                    [signParams setObject: weiXinReq.prepayId    forKey:@"prepayid"];
                    [signParams setObject:[NSString stringWithFormat:@"%d",weiXinReq.timeStamp]   forKey:@"timestamp"];
                    payRequsestHandler *payHandler  =  [[payRequsestHandler alloc]init];
                                                 //如果出现闪退加上这句话
                    [payHandler setKey:WeiXin_pkey];
                    NSString *sign = [payHandler createMd5Sign:signParams];
                    weiXinReq.sign = sign;
                
                    [WXApi sendReq:weiXinReq];
                }
                else
                {
                    [SVProgressHUD showView:self.view image:nil status:@"未安装微信"];
                }