[Bug] Launcher.OpenAsync() crashes in iOS 9.3.5

[Magendanz]

Description

On older iOS releases, Launcher.OpenAsync() crashes the app rather than opening the Uri.

Steps to Reproduce

1. Call method (e.g. Launcher.OpenAsync(new Uri(String.Format(page, authToken)))

Expected Behavior

Should open browser at target URL.

Actual Behavior

App immediately quits. No crash report from AppCenter.

Basic Information

Works fine in iOS 12. I haven't checked interim releases.

• Version with issue: iOS 9.3.5
• Last known good version: iOS 12.4.5
• IDE:
• Platform Target Frameworks:
  • iOS: 13.10.0.17
• Android Support Library Version:
• Nuget Packages: Xamarin.Forms v4.4.0.991640
• Affected Devices: iOS

For now, I'm reverting to Device.Open(), but that API is deprecated.

[Magendanz]

Okay, I got a crash report from AppCenter:

0xd0000 + 23567048
SIGABRT: Objective-C exception thrown. Name: NSInvalidArgumentException Reason: -[UIApplication openURL:options:completionHandler:]: unrecognized selector sent to instance 0x15e45e80 Native stack trace: 0 CoreFoundation 0x22753933 + 150 1 libobjc.A.dylib 0x21eeee17 objc_exception_throw + 38 2 CoreFoundation 0x227592b5 + 0 3 CoreFoundation 0x22756ee1 + 700 4 CoreFoundation 0x22682238 _CF_forwarding_prep_0 + 24 5 TRC.iOS 0x010b37f0 gc.safepoint_poll + 16090400 6 TRC.iOS 0x01106e08 gc.safepoint_poll + 16431928 7 TRC.iOS 0x01106fac gc.safepoint_poll + 16432348 8 TRC.iOS 0x01329a48 gc.safepoint_poll + 18671480 9 TRC.iOS 0x013299b0 gc.safepoint_poll + 18671328 10 TRC.iOS 0x00175e54 gc.safepoint_poll + 109444 11 TRC.iOS 0x0078e9cc gc.safepoint_poll + 6502140 12 TRC.iOS 0x0078ef40 gc.safepoint_poll + 6503536 13 TRC.iOS 0x0018eeec gc.safepoint_poll + 211996 14 TRC.iOS 0x0077ebc0 gc.safepoint_poll + 6437104 15 TRC.iOS 0x00846f24 gc.safepoint_poll + 7257172 16 TRC.iOS 0x0089c06c gc.safepoint_poll + 7605660 17 TRC.iOS 0x0089bfcc gc.safepoint_poll + 7605500 18 TRC.iOS 0x00636674 gc.safepoint_poll + 5092260 19 TRC.iOS 0x0027b248 gc.safepoint_poll + 1179512 20 TRC.iOS 0x015eb75b gc.safepoint_poll + 21562507 21 TRC.iOS 0x0167c89f gc.safepoint_poll + 22156751 22 TRC.iOS 0x0167f3e7 gc.safepoint_poll + 22167831 23 TRC.iOS 0x00117321 _ZN7plcrash2MS5async24dwarf_cfa_state_iteratorIyxE4nextEPjPNS1_28plcrash_dwarf_cfa_reg_rule_tEPy + 15308 24 TRC.iOS 0x00117135 _ZN7plcrash2MS5async24dwarf_cfa_state_iteratorIyxE4nextEPjPNS1_28plcrash_dwarf_cfa_reg_rule_tEPy + 14816 25 UIKit 0x26e0311b + 1126 26 UIKit 0x26ebe477 + 306 27 UIKit 0x26f774c9 + 268 28 UIKit 0x26f837db + 90 29 UIKit 0x26cc1b1d + 84 30 CoreFoundation 0x227156c9 + 20 31 CoreFoundation 0x227139cd + 280 32 CoreFoundation 0x22713dff + 958 33 CoreFoundation 0x22663229 CFRunLoopRunSpecific + 520 34 CoreFoundation 0x22663015 CFRunLoopRunInMode + 108 35 GraphicsServices 0x23c53ac9 GSEventRunModal + 160 36 UIKit 0x26d37189 UIApplicationMain + 144 37 TRC.iOS 0x010c51e8 gc.safepoint_poll + 16162584 38 TRC.iOS 0x011069c8 gc.safepoint_poll + 16430840 39 TRC.iOS 0x01106934 gc.safepoint_poll + 16430692 40 TRC.iOS 0x001933c8 gc.safepoint_poll + 229624 41 TRC.iOS 0x0027b248 gc.safepoint_poll + 1179512 42 TRC.iOS 0x015eb75b gc.safepoint_poll + 21562507 43 TRC.iOS 0x0167c89f gc.safepoint_poll + 22156751 44 TRC.iOS 0x01681347 gc.safepoint_poll + 22175863 45 TRC.iOS 0x015cedb1 gc.safepoint_poll + 21445345 46 TRC.iOS 0x01747e74 xamarin_release_block_on_main_thread + 32492 47 TRC.iOS 0x00142fb3 _ZN7plcrash2MS5async24dwarf_cfa_state_iteratorIyxE4nextEPjPNS1_28plcrash_dwarf_cfa_reg_rule_tEPy + 194654 48 libdyld.dylib 0x2230b873 + 2

Stack trace:
Runtime.ThrowNSException (System.IntPtr ns_exception)
Runtime.throw_ns_exception (System.IntPtr exc)
(wrapper native-to-managed) ObjCRuntime.Runtime.throw_ns_exception(intptr)
(wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate)
UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName)
Application.Main (System.String[] args)
(wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate)
UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName)
Application.Main (System.String[] args)

[Redth]

Do you know the actual URL causing the crash?

[Magendanz]

Well, it's crashed on every URL that I've tried. Most in my app are pointing to "https://start.voter-science.com/login/direct?auth={0}" with additional query params. The simplest is the one on the about box that just links to "https://canvas.voter-science.com/fwd/trc".

[jamesmontemagno]

Yes, this would crash because we do not support iOS 9 and we use the Async version of the OpenUrl which was introduced in iOS 10.

However, I think we can do this check. Workaround is to use Browser.OpenAsync and use External, that has the check in it.