具体支付代码： 
//调起微信支付 
PayReq* req = [[[PayReq alloc] init]autorelease]; 
req.openID = APPI_ID; 
req.partnerId = PARTNER_ID; 
req.prepayId = prePayid; 
req.nonceStr = nonce_str; 
req.timeStamp = now; 
req.package = package; 
req.sign = sign; 
[WXApi safeSendReq:req];

不得不吐槽，微信支付的SDK，这里连个代理都没有，所以，你想获取支付后的结果的返回信息，需要去AppDelegate里，添加如下代码，添加微信的代理：

• (BOOL)application:(UIApplication )application openURL:(NSURL )url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation 
  { 
  return [WXApi handleOpenURL:url delegate:self]; 
  }

然后，再实现这个方法：

-(void) onResp:(BaseResp*)resp 
1 
通过这个方法，你就可以获取微信支付后的信息了。但是如果这样，所有的支付代码都在AppDelegate里，不好，至少微信给的例子就是这样。我的方法是添加通知，代码如下：

-(void) onResp:(BaseResp*)resp 
{ 
if ([resp isKindOfClass:[PayResp class]]) 
{ 
PayResp response = (PayResp )resp;

// NSString *strTitle = [NSString stringWithFormat:@”支付结果”]; 
// NSString *strMsg = [NSString stringWithFormat:@”errcode:%d”, response.errCode]; 
// 
// UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle 
// message:strMsg 
// delegate:self 
// cancelButtonTitle:@”OK” 
// otherButtonTitles:nil, nil]; 
// [alert show];

    switch (response.errCode) {
        case WXSuccess: {
            NSNotification *notification = [NSNotification notificationWithName:ORDER_PAY_NOTIFICATION object:@"success"];
            [[NSNotificationCenter defaultCenter] postNotification:notification];
            break;
        }

        default: {
            NSNotification *notification = [NSNotification notificationWithName:ORDER_PAY_NOTIFICATION object:@"fail"];
            [[NSNotificationCenter defaultCenter] postNotification:notification];
            break;
        }
    }
}

}

然后，在支付那个VC，添加通知

pragma mark - tabBar隐藏

• (void)viewWillAppear:(BOOL)animated { 
  [super viewWillAppear:animated]; 
  if([WXApi isWXAppInstalled]) // 判断 用户是否安装微信 
  { 
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getOrderPayResult:) name:ORDER_PAY_NOTIFICATION object:nil];//监听一个通知 
  } 
  }

pragma mark - tabbar还原

• (void)viewWillDisappear:(BOOL)animated 
  { 
  [super viewWillDisappear:animated]; 
  [[NSNotificationCenter defaultCenter