iOSMessageBox.Message
From Xojo Documentation
Property (As Text )
aiOSMessageBox.Message = newTextValue
or
TextValue = aiOSMessageBox.Message
Supported on Mobile (iOS).
or
TextValue = aiOSMessageBox.Message
Supported on Mobile (iOS).
A longer message that appears below the title in the message box.
Sample Code
Set the message:
MessageBox1.Message = "Would you like to update this information?"