Bug 31124 - change MasterDetail.Detail navigation page
Summary: change MasterDetail.Detail navigation page
Alias: None
Product: Forms
Classification: Xamarin
Component: Forms ()
Version: 1.4.2
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: ---
Assignee: Bugzilla
Depends on:
Reported: 2015-06-15 14:39 UTC by Alessandro
Modified: 2015-06-17 13:09 UTC (History)
4 users (show)

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

project with bug (183.07 KB, application/zip)
2015-06-15 14:39 UTC, Alessandro

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Description Alessandro 2015-06-15 14:39:09 UTC
Created attachment 11608 [details]
project with bug

I have a masterdetail.
The Detail in a navigationPage.
In Android (iOS no problem), if I change the Detail with Detail = new NavigationPage(new PageDetail1()); it WORKS.
If I change with Detail = App.NP (a static NavigationPage) it does not work.
I don't know if it's a bug or it a mine mistake. I know that in iOS I have no exception.

To recreate:
1- run the project
2- visualize the master
3- click first button

this is the exception
The specified child already has a parent. You must call removeView() on the child's parent first.

The solution could be remove all pages from Detail, but I don't know how...
And in iOS I have't this problem..
Let me know
Comment 1 Rui Marinho 2015-06-17 06:06:00 UTC
Hi you shouldn't keep static reference to pages in your App that are being re-added to the navigation stack.
Looking at your code here's a suggest fix that would make your current implementation work:

	public static void SetMainNavigationPage(Page page){

			NavigationPage np;
			if (page.Parent != null)
				np = page.Parent as NavigationPage;
				np = new NavigationPage (page);

			App.NP = np; //{BarBackgroundColor = Library.ColorXamarin, BarTextColor = Color.White};
			App.NP.BarBackgroundColor = ColorXamarin;
			App.NP.BarTextColor = Color.White;
			App.NP.Icon = "transparent";
Comment 2 Alessandro 2015-06-17 13:09:54 UTC
thanks Rui
it works