ios - Photo picker shows on one second then disappears -

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I have an iOS application that is written in zenith. It is designed to target iOS 7.1. With SDK 8. My code looks like this: 

  dialog = DialogHelper.ShowProgress (see, "Uploading"); . Picker.PickPhotoAsync () ContinueWith (T => {if (t.IsCanceled || t.IsFaulted) {AppDelegate.FileUploadController.IsWorking = false; dialog.Dismiss (); Return;} MediaFile file = t.Result; string FilePath = file.Path; UploadHelper.UploadFile (filepath, _folderId, temporary, dialog);}, TaskScheduler.FromCurrentSynchronizationContext ());   
 It works well on iOS 7 (both simulator and device), but the screen is shown on loading on one screen on iOS 8 photo.  
 What am I doing wrong? I can not find any useful information googling it   
 
 
 In some other case, this requires the Will be, say:  
 
 A MediaPicker in response to a UIActionSheet.Clicked event will cause unexpected behavior on iOS 8. Use a UIAlertController with a style of conditional UIAlertControllerStyle.ActionSheet Must be updated to   
 Then if I have to use UIAlertController, then the device has been editing my code on iOS 8.  
 And it works.

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