应用启动首次进入多视图页面可能出现地图黑屏问题

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    FLDDLogDebug(@"函数");
    launchedFlag = NO;
    [[SingleAsyncSocket sharedInstance] initData];
    .
    .
    .
    }
-(void)initData
{
    FLDDLogDebug(@"函数");
    //通过判断是否生成管道来防止重复初始化
    if(nil == self.endWaitPipe)
    {
        //fir
        [FIR handleCrashWithKey:GENERALKEY];
        //友盟分享
        [UMSocialData setAppKey:MUMENGKEY];
        //友盟统计
        [MobClick startWithAppkey:MUMENGKEY reportPolicy:BATCH   channelId:@"web"];

        [SVProgressHUD setDefaultMaskType:SVProgressHUDMaskTypeClear];
        //地图
        [MAMapServices sharedServices].apiKey= MAMAPKEY;
        [AMapNaviServices sharedServices].apiKey =MAMAPKEY;
        [AMapSearchServices sharedServices].apiKey = MAMAPKEY;
        NSString *initString = [[NSString alloc] initWithFormat:@"appid=%@",IFLYKEY];
        [IFlySpeechUtility createUtility:initString];

        [[Singleton sharedInstance] setMAMapViewInstance:[[MAMapView alloc] initWithFrame:CGRectMake(0, 0, kControlWidth, kControlHeight)]];
        self.endWaitPipe = [NSPipe pipe];

    }
}


-(void)initMap
{
    MAMapView *namapView = (MAMapView *)([[Singleton sharedInstance] getMAMapViewInstance]);
    if(nil == namapView)
    {
        _mapView = [[MAMapView alloc] initWithFrame:CGRectMake(0, 0, kControlWidth, kControlHeight)];
        [[Singleton sharedInstance] setMAMapViewInstance:_mapView];
    }
    else
    {
        CGRect newRect = CGRectMake(0, 0, kControlWidth, kControlHeight);
        namapView.frame = newRect;
        _mapView = namapView;
    }

    _mapView.delegate = self;
    [self.view addSubview:_mapView];

    [self.view sendSubviewToBack:_mapView];

    [self initAMapProperty];
    //定位
    _mapView.showsUserLocation = YES;
}