https://github.com/TheCodeTraveler/CollectionViewBoundsExceptionRepro
Reproduction Sample for Xamarin.Forms.CollectionView
https://github.com/TheCodeTraveler/CollectionViewBoundsExceptionRepro
Last synced: 6 months ago
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Reproduction Sample for Xamarin.Forms.CollectionView
- Host: GitHub
- URL: https://github.com/TheCodeTraveler/CollectionViewBoundsExceptionRepro
- Owner: TheCodeTraveler
- License: mit
- Created: 2020-07-02T21:40:51.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2020-07-04T00:00:12.000Z (over 5 years ago)
- Last Synced: 2025-09-07T04:39:10.254Z (6 months ago)
- Language: C#
- Size: 322 KB
- Stars: 2
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# CollectionViewBoundsExceptionRepro
Reproduction Sample for Xamarin.Forms.CollectionView `NSRangeException`:
```bash
Objective-C exception thrown. Name: NSRangeException Reason: *** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array
```
### Reproduction Steps
1. Download / clone this repo
2. In Visual Studio, open `CollectionViewBoundsExceptionRepro.sln`
3. In Visual Studio, buld/deploy `CollectionViewBoundsExceptionRepro.iOS` to an iOS Simulator or Device
4. Confirm `NSRangeException` is thrown on launch
## Work Arounds
#### Option #1. Downgrade Xamarin.Forms
Downgrade to Xamarin.Forms v4.7.0.937-pre4
#### Option #2. Remove CollectionView.Footer
Set `CollectionView.Footer = null`
1. In `CollectionViewPage.cs`, change `Footer = new BoxView { BackgroundColor = Color.Red, HeightRequest = 53 }` to `Footer = null`
https://github.com/brminnick/CollectionViewBoundsExceptionRepro/blob/8a6636d7af57f289113e800cfa0d0160cad78d6d/Src/CollectionViewBoundsExceptionRepro/CollectionViewPage.cs#L17
#### Option #3. Replace `IEnumerable` with `ObservableCollection`
1. In `CollectionViewModel.cs`, remove `public IEnumerable ScoreCollectionList`
2. In `CollectionViewModel.cs`, remove `IEnumerable? _scoreCollectionList;`
3. In `CollectionViewModel.cs`, add `public ObservableCollection ScoreCollectionList { get; } = new ObservableCollection()`
4. In `CollectionViewModel.cs`, in `ExecuteRefreshCommand` refactor logic for `ObservableCollection` :
Replace this code:
```csharp
void ExecuteRefreshCommand()
{
ScoreCollectionList = Enumerable.Range(0, 100).ToList();
IsRefreshing = false;
}
```
with this code:
```csharp
void ExecuteRefreshCommand()
{
foreach (var number in Enumerable.Range(0, 100))
ScoreCollectionList.Add(number);
IsRefreshing = false;
}
```
### Screenshots
### Environment
=== Visual Studio Enterprise 2019 for Mac (Preview) ===
Version 8.7 Preview (8.7 build 1802)
Installation UUID: ec012746-7bcc-47bc-bba9-e9b5ade4bdc7
GTK+ 2.24.23 (Raleigh theme)
Xamarin.Mac 6.18.0.23 (d16-6 / 088c73638)
Package version: 612000074
=== Mono Framework MDK ===
Runtime:
Mono 6.12.0.74 (2020-02/e9d3af508e4) (64-bit)
Package version: 612000074
=== Roslyn (Language Service) ===
3.7.0-3.20312.3+ec4841263590f5456e32728d98097e97c1605e22
=== NuGet ===
Version: 5.7.0.6653
=== .NET Core SDK ===
SDK: /usr/local/share/dotnet/sdk/5.0.100-preview.6.20318.15/Sdks
SDK Versions:
5.0.100-preview.6.20318.15
3.1.301
3.1.300
3.1.202
3.1.200
3.1.102
3.0.101
2.1.803
MSBuild SDKs: /Library/Frameworks/Mono.framework/Versions/6.12.0/lib/mono/msbuild/Current/bin/Sdks
=== .NET Core Runtime ===
Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
5.0.0-preview.6.20305.6
5.0.0-preview.1.20120.5
3.1.5
3.1.4
3.1.2
3.1.1
3.1.0
3.0.3
3.0.1
2.1.19
2.1.18
2.1.17
2.1.16
2.1.15
2.1.14
=== Xamarin.Profiler ===
Version: 1.6.13.11
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler
=== Updater ===
Version: 11
=== Apple Developer Tools ===
Xcode 11.5 (16139)
Build 11E608c
=== Xamarin.Mac ===
Version: 6.20.1.18 (Visual Studio Enterprise)
Hash: 8ffa3d888
Branch: d16-7
Build date: 2020-06-06 13:34:07-0400
=== Xamarin.iOS ===
Version: 13.20.1.18 (Visual Studio Enterprise)
Hash: 8ffa3d888
Branch: d16-7
Build date: 2020-06-06 13:34:08-0400
=== Xamarin Designer ===
Version: 16.7.0.459
Hash: 65d9dd3aa
Branch: remotes/origin/d16-7
Build date: 2020-06-10 03:48:34 UTC
=== Xamarin.Android ===
Version: 10.4.0.0 (Visual Studio Enterprise)
Commit: xamarin-android/d16-7/de70286
Android SDK: /Users/bramin/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
7.0 (API level 24)
8.0 (API level 26)
8.1 (API level 27)
SDK Tools Version: 26.1.1
SDK Platform Tools Version: 30.0.2
SDK Build Tools Version: 29.0.2
Build Information:
Mono: 87ef555
Java.Interop: xamarin/java.interop/d16-7@76d1ac7
ProGuard: Guardsquare/proguard/proguard6.2.2@ebe9000
SQLite: xamarin/sqlite/3.32.1@1a3276b
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-7@017078f
=== Microsoft OpenJDK for Mobile ===
Java SDK: /Users/bramin/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.25
1.8.0-25
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL
=== Android SDK Manager ===
Version: 16.7.0.8
Hash: 6e20e98
Branch: remotes/origin/d16-7
Build date: 2020-06-11 19:23:34 UTC
=== Android Device Manager ===
Version: 16.7.0.12
Hash: 51b7059
Branch: remotes/origin/d16-7
Build date: 2020-06-11 19:23:58 UTC
=== Build Information ===
Release ID: 807001802
Git revision: 2129f3002481c263b627ea82a6f25349ee5947cb
Build date: 2020-06-22 06:15:44-04
Build branch: release-8.7
Xamarin extensions: 2129f3002481c263b627ea82a6f25349ee5947cb
=== Operating System ===
Mac OS X 10.15.5
Darwin 19.5.0 Darwin Kernel Version 19.5.0
Tue May 26 20:41:44 PDT 2020
root:xnu-6153.121.2~2/RELEASE_X86_64 x86_64