Bug 30867 - ShouldStartLoad causes InvalidOperationException to be thrown when instantiating a webview
Summary: ShouldStartLoad causes InvalidOperationException to be thrown when instantiat...
Alias: None
Product: Forms
Classification: Xamarin
Component: iOS ()
Version: 1.4.4
Hardware: PC Mac OS
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2015-06-06 11:55 UTC by Cody Beyer (MSFT)
Modified: 2016-04-09 01:39 UTC (History)
3 users (show)

Tags: ac ios webview ra
Is this bug a regression?: ---
Last known good build:

TestCase (658.01 KB, application/zip)
2015-06-06 11:56 UTC, Cody Beyer (MSFT)

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Description Cody Beyer (MSFT) 2015-06-06 11:55:05 UTC
### Description

The following app attempts to load a WebView at load. This throws an exception, as linked below

### Sample


### Exception 


### Steps to Reproduce

1. Download attached sample
2. Deploy to iOS Simulator

### Excepted Results

App should launch and display WebView

### Actual Results

App crashes with above linked exception

### Version

=== Xamarin Studio ===

Version 5.9.3 (build 1)
Installation UUID: fc65f77a-6bee-473f-8adb-6b27b14a8197
	Mono 4.0.1 ((detached/ed1d3ec)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 400010044

=== Xamarin.Android ===

Version: (Business Edition)
Android SDK: /Users/codybeyer/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		2.3   (API level 10)
		4.0.3 (API level 15)
		4.4   (API level 19)
		5.0   (API level 21)
Java SDK: /usr
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)

=== Xamarin Android Player ===

Version: Unknown version
Location: /Applications/Xamarin Android Player.app

=== Apple Developer Tools ===

Xcode 6.3.2 (7718)
Build 6D2105

=== Xamarin.iOS ===

Version: (Business Edition)
Hash: e6ebd18
Branch: master
Build date: 2015-05-21 21:55:09-0400

=== Xamarin.Mac ===

Version: (Business Edition)

=== Build Information ===

Release ID: 509030001
Git revision: 5a524e1726ed103fdd4fe37e0356f2b35466ce9d
Build date: 2015-06-02 16:35:08-04
Xamarin addins: 51957cfbd06be911b212671ad05c2c6221ac90f9

=== Operating System ===

Mac OS X 10.10.3
Darwin Codys-MacBook-Pro.local 14.3.0 Darwin Kernel Version 14.3.0
    Mon Mar 23 11:59:05 PDT 2015
    root:xnu-2782.20.48~5/RELEASE_X86_64 x86_64
Comment 1 Cody Beyer (MSFT) 2015-06-06 11:56:17 UTC
Created attachment 11491 [details]
Comment 2 Chris King 2015-06-09 19:47:12 UTC
Thanks for taking the time to submit this issue. The exception is thrown because internally we've already attached a delegate (UIWebViewDelegate) to the webview and mixing delegate based eventing with the C# eventing is not supported. I'd guess we'll expose the event you're trying to access as a first class citizen so you wouldn't have to make a custom renderer however we're reviewing internally how to best support this scenario.

Warm regards,
Xamarin Forms Team