Bug 32289 - UIScreen.MainScreen.NativeScale call crashed app
Summary: UIScreen.MainScreen.NativeScale call crashed app
Alias: None
Product: Forms
Classification: Xamarin
Component: iOS ()
Version: 1.3.3
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2015-07-22 04:37 UTC by Paul
Modified: 2016-04-11 09:13 UTC (History)
2 users (show)

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

Demo project to repro (157.74 KB, application/zip)
2015-07-22 04:37 UTC, Paul
Reapcked project to repro (156.73 KB, application/x-zip-compressed)
2015-07-22 11:01 UTC, Paul

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Description Paul 2015-07-22 04:37:43 UTC
Created attachment 12150 [details]
Demo project to repro

public override bool FinishedLaunching(UIApplication app, NSDictionary options)

            var x = UIScreen.MainScreen.NativeScale;

            LoadApplication(new App());

            return base.FinishedLaunching(app, options);

App will crash on var x declaration when running on iPhone 4 with iOS 7.

Mac OS X: 10.9.4
Xamarin Studio: 5.9.4 build 5
XCode: 6.2 (6776)
iPhone 4, iOS 7.1.2

Xamarin.Forms version=


  at ObjCRuntime.Runtime.ThrowNSException (IntPtr ns_exception) [0x00000] in /Users/builder/data/lanes/1880/ef8c2f77/source/maccore/src/ObjCRuntime/Runtime.cs:167 
  at ObjCRuntime.Runtime.throw_ns_exception (IntPtr exc) [0x00000] in <filename unknown>:0 
  at (wrapper native-to-managed) ObjCRuntime.Runtime:throw_ns_exception (intptr)
  at (wrapper managed-to-native) UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
  at UIKit.UIApplication.Main (System.String[] args, IntPtr principal, IntPtr delegate) [0x00005] in /Users/builder/data/lanes/1880/ef8c2f77/source/maccore/src/UIKit/UIApplication.cs:63 
  at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0001c] in /Users/builder/data/lanes/1880/ef8c2f77/source/maccore/src/UIKit/UIApplication.cs:46 
  at UIScreen_NativeScale.iOS.Application.Main (System.String[] args) [0x00008] in /Users/admin/Projects/UIScreen_NativeScale/iOS/Main.cs:17
Comment 1 Chris King 2015-07-22 10:52:19 UTC
Thanks for taking the time to submit this bug. Please repackage the repro so it's simply zipped and not wrapped twice and we'll take a look at it. 

Warm regards,
Comment 2 Paul 2015-07-22 11:01:09 UTC
Created attachment 12160 [details]
Reapcked project to repro

I've repack demo proj
Comment 3 Jason Smith [MSFT] 2016-04-11 09:13:09 UTC
Thank you for taking the time to submit this report. After reviewing the description of this bug, we believe it no longer affects the current version of Xamarin.Forms. If you are still experiencing the issue after updating your packages, please reopen this report with an attached reproduction.
For your convenience, we have created some reproduction best practices viewable here: https://gist.github.com/jassmith/92405c300e54a01dcc6d

Warm regards,
Xamarin Forms Team