TabbedPage.CurrentPage is null for "More" group tabs on iOS

[brianlagunas]

Description

When switching tabs within the "more" group of a TabbedPage on iOS, the CurrentPageChanged event does not fire and the CurrentPage property is not properly set and will return null.

That means there is no way to get the current selected tab if it exists in the “more” group.

Steps to Reproduce

1. Create a TabbedPage with 7+ tabs (see repo link)
2. Handle the CurrentPageChanged event and set a break point
3. Run the app on iOS
4. Selected various tabs in the "more" group and observe the event never fires and the CurrentPage property is consistently null until you switch to a tab that is not located in the "more" group. Click on the "CurrentPage" button on any of the tabs within the "more" group and notice that no Alert is displayed as the CurrentPage is null. However, select a tab not in the "more" group and click the "CurrentPage" button and the Alert is displayed with the CurrentPage value.

Expected Behavior

The CurrentPageChange event should fire and the CurrentPage property should be set on each tab change regardless of if it exists in the "more" group or not.

Actual Behavior

The CurrentPageChange event does not fire and the CurrentPage is null when selecting tabs in the "more" group on iOS.

Basic Information

• Version with issue: 2.5.0.77107
• Last known good version: none
• IDE: VS2017 15.5
• Platform Target Frameworks:
  • iOS: 11.1

Reproduction Link

https://github.com/brianlagunas/TabbedPageCurrentPageIssue

[adrianknight89]

I think More is not really supported by Forms. This was because of the fact that the More controller is a navigation controller and any of the tabs under this group can potentially be another navigation controller. To prevent nested navigation controllers, support for this button was never rolled out.

See #573.

[Gh0stC0de]

Is there any workaround that a tabbed pages ItemsSource can contain more than 5 content pages?

[samhouts]

Last tested with 4.0.0.62955-pre2, and still an issue, but I'm going to reclassify this as an enhancement. Thanks!

[igbenic]

Sadly, still having the same problem, is there a way of modifying tabbed page as a workaround? Thank you in advance.