iOS 8今日小工具显示空白几秒钟

拉下通知中心后,我的今天小部件需要0到5秒才能显示。当我向通知中心移动一点时,我的小部件再次消失。

一旦小部件可见,一切都正常工作。

我错过了什么?

override func viewDidLoad() {
    super.viewDidLoad()
    self.locationManager.delegate = self
    if (self.locationManager.respondsToSelector(Selector("requestWhenInUseAuthorization"))){
        self.locationManager.requestWhenInUseAuthorization()
    }
}

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(true)
    self.locationManager.startUpdatingLocation()
    imageViewCheck.layer.cornerRadius = 5.0
    self.getLocation()  
}

func getLocation() -> Bool{
    var test = self.locationManager.location
    if test != currentLocation {
        currentLocation = test
        return true
    } else {
        return false
    }  
}

func widgetPerformUpdateWithCompletionHandler(completionHandler: ((NCUpdateResult) -> Void)!) {
    var newLocation = self.getLocation()
    if (newLocation) {
        completionHandler(NCUpdateResult.NewData)
    } else {
        completionHandler(NCUpdateResult.NoData)
    }
}