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Place a view which contains a web view in the detail page of a master detail page - perform some navigation in the web view that would enable the go forward/back methods on the webview. Switch the content of the detail page (as you would from a flyout menu), then switch back to the original page. The page will be at the same page you last navigated to but the navigation history will be lost.
This is a regression as it used to work in a previous version of forms, I think the issue is that the renderers are now disposed when the detail pane is switched which means a new native web view is created.
I have tried to reproduce this issue but not able to reproduce it.
Could you provide a sample, ide log and environment info, so we can reproduce this issue at our end.
You can get Ide log via Help -> Open Log Directory and Environment info via Xamarin Studio -> About Xamarin Studio -> Show Details
Created attachment 14554 [details]
Steps to reproduce:
-Open app(i've been testing on android).
-Open the flyout menu select "Web View". Bbc news homepage will be loaded
-select a story -> navigates into page(observe forward/back behaviour then works)
-Use fly out menu, navigate back to original page.
-Use flyout again to navigate back into web view page.
-Forward/back buttons no longer work as history is lost(renderer has recreated the native control i think).
Prior to XF 1.5.1 this worked. (you can download the older nuget package to verify).
Version 5.10.1 (build 6)
Installation UUID: fcc1541f-eb9f-4db6-9b47-82298496eeb3
Mono 4.2.1 (explicit/6dd2d0d)
GTK+ 2.24.23 (Raleigh theme)
Package version: 402010102
Apple Developer Tools
Xcode 7.2 (9548)
Version: 188.8.131.52 (Enterprise Edition)
Build date: 2015-12-08 16:20:29-0500
Version: 184.108.40.206 (Enterprise Edition)
Android SDK: /Users/xxxxxx/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
2.3 (API level 10)
4.0.3 (API level 15)
4.1 (API level 16)
4.4 (API level 19)
5.0 (API level 21)
5.1 (API level 22)
6.0 (API level 23)
SDK Tools Version: 24.4.1
SDK Platform Tools Version: 23.0.1
SDK Build Tools Version: 20.0.0
Java SDK: /usr
java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-466.1-11M4716)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-466.1, mixed mode)
Xamarin Android Player
Location: /Applications/Xamarin Android Player.app
Release ID: 510010006
Git revision: 0b60eecdb531933734519c13257d16a780274aab
Build date: 2015-12-04 20:28:20-05
Xamarin addins: 9876fd7c9837977178411ec7375b4352c0a0d6af
Build lane: monodevelop-lion-cycle6-baseline
Mac OS X 10.10.5
Darwin xxxxxxxx.xxxxxx.xxxx.net 14.5.0 Darwin Kernel Version 14.5.0
Tue Sep 1 21:23:09 PDT 2015
I have tried to reproduce this issue with following steps:
1. Open attached sample project given in comment 2
2. Run the sample
3. click on Web View
4. Observed that BBC News appear
5. choose any news
6. Observed that it is open successfully
7. Use Back or Forward button(it is working fine)
8. Go to menu page and choose Not a Web View
9. Again go to menu page and choose Web View
10. Observed that a news will open which we choose in step 5
11. Click to Back button
Actual result: Observed that I am not navigate to back. Here is the screencast for the same: http://www.screencast.com/t/JsccnRdh6
But I am not sure I am reproduce correct or not. Let me know if I missed any steps.
I have checked this issue on both Xamarin.Forms 220.127.116.1147 and Xamarin.Forms 18.104.22.16890 and getting same behaviour.
Thanks for investigating. Your screencast illustrates the issue on the latest version.
Have you also changed the package reference to the older version of the nugget package for the WebViewTest Library that contains the views as well as the startup project?
When i set the XForms package to 22.214.171.12447 on both assemblies i can get it working (this used to work in our live app).
This is caused by the fact that the renderers are not retained in this case. You need a method to retain this renderer so the native stack is also retained.
Is this something devs have to do on their own? I'd expect this kind of behavior to be default in XF.
At the same time, I'm somewhat reluctant to see a change in this behavior. In most cases, WebView should be shown modally as a single page. What's a real-world scenario where you want it to be a detail page? A long-running WebView should not be a replacement for a browser.
That said, I think there is a property somewhere in the source code that determines if native handlers should be disposed.