Bug 4414 - Subclassing UIView and overriding BackgroundColor crashes on device but not simulator.
Summary: Subclassing UIView and overriding BackgroundColor crashes on device but not s...
Alias: None
Product: iOS
Classification: Xamarin
Component: General ()
Version: 5.2
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2012-04-12 17:59 UTC by mgreger
Modified: 2012-04-12 20:19 UTC (History)
2 users (show)

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

Subclass example (386 bytes, application/octet-stream)
2012-04-12 17:59 UTC, mgreger

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Description mgreger 2012-04-12 17:59:23 UTC
Created attachment 1663 [details]
Subclass example

Create a new single view iPhone project. Create a class that derives from UIView, mark it with the Register attribute, create a constructor which takes an IntPtr, and override the BackgroundColor property. Open the iPhone view in interface builder and change the view to use the custom subclass. The resulting application will run fine on the simulator, but crash on a real iPhone or iPod touch (tested on iOS 4 and 5). This behavior does not seem to happen if a xib file is not used and the view is created programmatically.

Mono: 2.10.9 
Monotouch: 5.2.10 
Mac OS X 10.7.3
Comment 1 Rolf Bjarne Kvinge [MSFT] 2012-04-12 18:21:45 UTC
I can reproduce this, looking at it now.
Comment 2 Rolf Bjarne Kvinge [MSFT] 2012-04-12 20:19:32 UTC
Fixed in master (364b2ce2) and 5.2-series (ca3faa42); unit tests added too. The next releases with this fix will be 5.2.12 and 5.3.3.

In the meantime I believe you can use this workaround in your custom view:

[Export ("backgroundColor", ArgumentSemantic.Retain)]
public new UIColor BackgroundColor {
   get { return base.BackgroundColor; }
   set { base.BackgroundColor = value; }