Thanks for using Syncfusion products.
We have checked your provided sample and found that Schedule not rendered because of SfScheduleRenderer instance not created in Finished Launching overridden method of App Delegate class in iOS Project. Please check the below code snippet,
public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
new SfScheduleRenderer (); // need to add this line for Forms iOS schedule rendering
return base.FinishedLaunching(application, launchOptions);
We have also modified the sample by adding the new SfScheduleRenderer in the AppDelegate, please refer the sample in below link.
You can also refer our online User Guide Documentation by using the below link for SfSchedule,
Online Link: http://help.syncfusion.com/xamarin/sfschedule/getting-started
Please let us know, if you need any further assistance.
Subburaj Pandian V