Bug 39431 - iOS: ListView incorrectly calculating it's scroll height when in a NavigationPage and contained in a AbsoluteLayout
Summary: iOS: ListView incorrectly calculating it's scroll height when in a Navigation...
Status: CONFIRMED
Alias: None
Product: Forms
Classification: Xamarin
Component: iOS ()
Version: 2.1.0
Hardware: Macintosh Mac OS
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2016-03-08 01:08 UTC by Cliff Cawley
Modified: 2017-01-05 22:26 UTC (History)
8 users (show)

Tags: ac
Is this bug a regression?: ---
Last known good build:


Attachments
Sample Project that reproduces bug (260.56 KB, application/zip)
2016-03-08 01:08 UTC, Cliff Cawley
Details
Revised Sample (50.88 KB, application/zip)
2016-03-10 23:36 UTC, Cliff Cawley
Details


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Status:
CONFIRMED

Description Cliff Cawley 2016-03-08 01:08:26 UTC
Created attachment 15296 [details]
Sample Project that reproduces bug

Sample project attached which reproduces on both Android/iOS.

This was recently introduced in 2.1.0.6524.
It works fine on 2.1.0.6505.

## Steps to reproduce

1. Download attached sample
2. Build All and run on iOS/Android

## Expected result

iOS:
Listview can be scrolled all the way to the bottom.
Android:
Listview extends to the bottom and can be scrolled to the bottom.

## Actual result

iOS:
You can't scroll all the way to the bottom, items are still off the bottom of the view.

Android:
The Listview doesn't completely cover the view, instead it's only about 3/4 covered.

## Notes
In App.cs if you use:
    MainPage = new ViewDemo();
instead of:
    MainPage = new NavigationPage( new ViewDemo());
Then it works fine
Comment 1 Jason Smith [MSFT] 2016-03-10 20:25:04 UTC
You left the arrangement of the ListView as undefined, this resolves the issue:

<ListView AbsoluteLayout.LayoutBounds="0, 0, 1, 1" AbsoluteLayout.LayoutFlags="All" x:Name="ListDemo" HasUnevenRows="true" IsPullToRefreshEnabled="true">
Comment 2 Cliff Cawley 2016-03-10 23:36:13 UTC
Created attachment 15355 [details]
Revised Sample

Okay sorry about that, looks like I simplified the demo too much up to a point where it looked like it was the same bug.

I've now set it up how I have it in my project, but just culled some extra cruft, so you'll see some additional additional nesting of layouts because in my project I have other things in there.

I've basically embedded it within a MasterDetailPage.

The scrolling is now broken again.
Comment 3 Cliff Cawley 2016-03-10 23:36:34 UTC
Re-opened as I messed up when I created the original demo
Comment 4 Cliff Cawley 2016-03-11 00:10:17 UTC
Oh and it works fine on Android, it's just busted on iOS.
Comment 5 Cliff Cawley 2016-03-11 00:38:14 UTC
Additionally, in the new sample, it appears to be the AbsoluteLayout. If you remove that, it works.

I can't remove it in my project though, because I have several children that I use to position a few things over the top of each other