定义

{
    enum WXScene _scene;
}

3.在AppDelegate.m中

- (id)init{
    if(self = [super init]){
        _scene = WXSceneSession;
    }
    return self;
}
-(void) changeScene:(NSInteger)scene
{
    _scene = scene;
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
	
    // 其它代码

    // 向微信注册应用ID
    [WXApi registerApp:@"wx1432f1d44b2f2696"];
}

#pragma mark -  //重写AppDelegate的handleOpenURL和openURL方法
- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url
{
    return [WXApi handleOpenURL:url delegate:self];
}

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

-(void) onReq:(BaseReq*)req
{
    if([req isKindOfClass:[GetMessageFromWXReq class]])
    {
        // 微信请求App提供内容， 需要app提供内容后使用sendRsp返回
        NSString *strTitle = [NSString stringWithFormat:@"微信请求App提供内容"];
        NSString *strMsg = @"微信请求App提供内容，App要调用sendResp:GetMessageFromWXResp返回给微信";
        
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle message:strMsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        alert.tag = 1000;
        [alert show];
        [alert release];
    }
    else if([req isKindOfClass:[ShowMessageFromWXReq class]])
    {
        ShowMessageFromWXReq* temp = (ShowMessageFromWXReq*)req;
        WXMediaMessage *msg = temp.message;
        
        //显示微信传过来的内容
        WXAppExtendObject *obj = msg.mediaObject;
        
        NSString *strTitle = [NSString stringWithFormat:@"微信请求App显示内容"];
        NSString *strMsg = [NSString stringWithFormat:@"标题：%@ \n内容：%@ \n附带信息：%@ \n缩略图:%u bytes\n\n", msg.title, msg.description, obj.extInfo, msg.thumbData.length];
        
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle message:strMsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }
    else if([req isKindOfClass:[LaunchFromWXReq class]])
    {
        //从微信启动App
        NSString *strTitle = [NSString stringWithFormat:@"从微信启动"];
        NSString *strMsg = @"这是从微信启动的消息";
        
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle message:strMsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }
}

-(void) onResp:(BaseResp*)resp
{
    if([resp isKindOfClass:[SendMessageToWXResp class]])
    {
        NSString *strTitle = [NSString stringWithFormat:@"发送媒体消息结果"];
        NSString *strMsg = [NSString stringWithFormat:@"errcode:%d", resp.errCode];
        
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle message:strMsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }
}

- (void) sendTextContent
{
    SendMessageToWXReq* req = [[[SendMessageToWXReq alloc] init]autorelease];
    req.text = @"这里写你要分享的内容。";
    req.bText = YES;
    req.scene = _scene;
    
    [WXApi sendReq:req];
}