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When the VerticalOptions are set to Start(AndExpand) and the FontSize is changed (by my binding) the height of the label isn't updated correctly. It uses the height of the change before.
For example: If my label fontsize is 14, then I'm changing it (changing my binding class) to FontSize 8 the height if the label is still the height used by size of 14. Then when chaning back to 14, it seems that the label height is set to the calculated height for size 8 as it's far to less.
I've a Xamarin Forms Tests app where I created a separate page for this testing.
(the Page: https://github.com/App-Artment/xamarin-forms-tests/blob/master/XamarinFormsTests/Views/LabelControlPage.cs
the PageModel: https://github.com/App-Artment/xamarin-forms-tests/blob/master/XamarinFormsTests/ViewModels/LabelControlViewModel.cs)
To test it inside the app go to Controls -> Label
There you can change the FontSize using the 3 buttons.
I have checked this issue and able to reproduce this. To reproduce this issue I have followed the steps mentioned below:
1. Open attached test case, in XS.
2. Set iOS start up project, and deploy it on simulator.
3. Click "Tap here to start "=>"Controls"=>"Label"
4. Click on the Font size: 18 and then 14 or 8
5. Click on the Font size: 14 and then 8
Observe that If label's font size is 18, then user changed it to FontSize 14 or 8, the height if the label is still the height used by size of 18.
XS Logs: http://www.screencast.com/t/TsllglwP8
=== Xamarin Studio ===
Version 5.5.4 (build 15)
Installation UUID: 011d70a5-dede-428b-ab04-ef451c2e539d
Mono 3.10.0 ((detached/92c4884)
GTK+ 2.24.23 (Raleigh theme)
Package version: 310000031
=== Xamarin.Android ===
Version: 126.96.36.199 (Business Edition)
Android SDK: /Users/MM/Desktop/android-sdk-macosx
Supported Android versions:
2.1 (API level 7)
2.2 (API level 8)
2.3 (API level 10)
3.1 (API level 12)
3.2 (API level 13)
4.0 (API level 14)
4.0.3 (API level 15)
4.1 (API level 16)
4.2 (API level 17)
4.3 (API level 18)
4.4 (API level 19)
4.4.87 (API level 20)
5.0 (API level 21)
Java SDK: /usr
java version "1.7.0_65"
Java(TM) SE Runtime Environment (build 1.7.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)
=== Apple Developer Tools ===
Xcode 6.1 (6604)
=== Xamarin.iOS ===
Version: 188.8.131.52 (Business Edition)
Build date: 2014-11-16 21:03:22-0500
=== Xamarin.Mac ===
Version: 184.108.40.206 (Business Edition)
=== Build Information ===
Release ID: 505040015
Git revision: f93940a35458a18052f1a25e106e62ca970d9c40
Build date: 2014-11-19 15:32:41-05
Xamarin addins: dc23cbd91a3a0e1d326328e1229e86c942a49ec8
=== Operating System ===
Mac OS X 10.9.5
Darwin MacMini.local 13.4.0 Darwin Kernel Version 13.4.0
Sun Aug 17 19:50:11 PDT 2014
Fixed in next prerelease