Crash when swiping in iOS on DayView with custom AppointmentView

Question

I am using SfSchedule (18.4.0.33) in A Xamarin.Forms (4.8) app and when I swipe on iOS to change day the app crashes.

I'm using a custom DataTemplate for AppointmentView.

The resulting stack trace is below:

unhandled error: System.NullReferenceException: Object reference not set to an instance of an object

at UIKit.UIStringDrawing.StringSize (Foundation.NSString This, UIKit.UIFont font) [0x00023] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/UIKit/UIStringDrawing.g.cs:229

at UIKit.UIStringDrawing.StringSize (System.String This, UIKit.UIFont font) [0x00007] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/UIKit/UIStringDrawing.cs:65

at Syncfusion.SfSchedule.iOS.AppointmentView.LayoutSubviews () [0x001be] in <37836af923c040439b91666e630ba376>:0

at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)

at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:86

at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0000e] in /Library/Frameworks/Xamarin.iOS.framework/Versions/14.6.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:65

Kind regards,

Paul

Muniappan Subramanian · Answer

Hi Paul Chapman, 
 
Thank you for contacting Syncfusion support. 
 
We have checked the reported issue “Crash when swiping in iOS on DayView with custom Appointment View “and it’s working fine from our end. We have tested sample with Xamarin.Forms version (4.8.0.1821) and latest SfCalendar version (18.4.0.33) version on iOS version (14.1 & 12.1). Please refer to the tested sample and video in the following link for your reference. 
 
Sample:  https://www.syncfusion.com/downloads/support/directtrac/general/ze/ScheduleXamarin-470149370 
video: https://www.syncfusion.com/downloads/support/directtrac/general/ze/video1562400911 
 
Please check the sample and let us know if you still facing the same issue? If not, please modify the sample based on your scenario and revert us back with the following details, 
 
·         Share the issue replicate video.  
·         Share the target version used in sample.  
·         Share the iOS version and Xamarin.Forms version 
·         Share the Syncfusion version used in sample.  
 
Regards, 
Muniappan S.