Demonstration of a bug in Xamarin Forms 4.6.0.847 - 4.4.0.991757 and probably more
If you add a label to a vertical stack layout programatically then remove it then readd setting the stacklayout to IsVisible false each time when it has no children
On the second add the stacklayout is set to visible, it does have a child label but the contents are still invisible
There was a similiar bug in GTK xamarin/Xamarin.Forms#3665 this one has a work around to add a HeightRequest to the label but this does not work here
This bug is present in both Android and iOS
To reproduce the bug;
- Run the solution
- Click the Add label button
- Label and stacklayout are correctly shown
- Click the remove label button
- Label is removed from stacklayout
- As there are no children the stacklayout is set to IsVisible false correctly
- Click the Add Label button
- Label is added to stacklayout
- Stacklayout is set to IsVisible true
- Stacklayout is shown
- Label is not shown
| First dynamic label add | Second dynamic label add |
|---|---|
 |
 |
Workaround:
Set the stacklayout to IsVisible true before adding the dynamic content and the content will be correctly shown