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3
Votes

Application crashes while drag and scroll an appointment

Hi, 

The crash is reproducible on official Syncfusion Xamarin examples (Schedule project), v19.4.0.38. I manually upgraded SfSchedule NuGet up to the latest v19.4.0.42 and the issue still exists.

Steps to reproduce:

  1. Open the demo app and go to Drag and Drop screen
  2. Tap to any existing appointment to activate the Drag and Drop feature
  3. Drag the appointment to the previous week, then one more week back
  4. Still hold the appointment and drag it to the top of the calendar
  5. Autoscroll should be activated and the scheduler should scroll the time slots to the earlier hours
  6. The crash happens. 

The Day, Week, and Work Week views are affected. I also attached the short screen recording with the steps above.


The stack trace is here:

Syncfusion.SfSchedule.iOS.DragAndDropController.SetScrollPosition (Syncfusion.SfSchedule.iOS.SFDayView dayView)
Syncfusion.SfSchedule.iOS.DragAndDropController.EnableAutoScroll ()
Syncfusion.SfSchedule.iOS.DragAndDropController.NavigateScrollTimer_Elapsed ()
Syncfusion.SfSchedule.iOS.DragAndDropController.b__26_1 (Foundation.NSTimer )
NSTimerActionDispatcher.Fire (Foundation.NSTimer timer)
(wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate)
UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName)
Application.Main (System.String[] args)


It is possible to avoid the crash for iOS by disabling auto-scroll.

SfScheduleView.DragDropSettings.AllowScroll = false;
Looking forward to the fix in the nearest NuGet releases :)