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using System;
using System.Collections.Generic;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
using System.Threading;
#if UITEST
using Xamarin.UITest;
using NUnit.Framework;
#endif
namespace Xamarin.Forms.Controls.Issues
{
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Bugzilla, 43941, "Memory leak with ListView's RecycleElement on iOS", PlatformAffected.iOS)]
public class Bugzilla43941 : TestNavigationPage
{
protected override void Init()
{
PushAsync(new LandingPage43941());
}
#if UITEST && __IOS__
[Test]
public void Bugzilla43941Test()
{
for (var n = 0; n < 10; n++)
{
RunningApp.WaitForElement(q => q.Marked("Push"));
RunningApp.Tap(q => q.Marked("Push"));
RunningApp.WaitForElement(q => q.Marked("ListView"));
RunningApp.Back();
}
// At this point, the counter can be any value, but it's most likely not zero.
// Invoking GC once is enough to clean up all garbage data and set counter to zero
RunningApp.WaitForElement(q => q.Marked("GC"));
RunningApp.Tap(q => q.Marked("GC"));
RunningApp.WaitForElement(q => q.Marked("Counter: 0"));
}
#endif
}
[Preserve(AllMembers = true)]
public class ContentPage43941 : ContentPage
{
public ContentPage43941()
{
Interlocked.Increment(ref LandingPage43941.Counter);
System.Diagnostics.Debug.WriteLine("Page: " + LandingPage43941.Counter);
var list = new List<int>();
for (var i = 0; i < 30; i++)
list.Add(i);
Title = "ContentPage43941";
Content = new ListView
{
HasUnevenRows = true,
ItemsSource = list,
AutomationId = "ListView"
};
}
~ContentPage43941()
{
Interlocked.Decrement(ref LandingPage43941.Counter);
System.Diagnostics.Debug.WriteLine("Page: " + LandingPage43941.Counter);
}
}
[Preserve(AllMembers = true)]
public class LandingPage43941 : ContentPage
{
public static int Counter;
public Label Label;
public LandingPage43941()
{
Label = new Label
{
Text = "Counter: " + Counter,
HorizontalTextAlignment = TextAlignment.Center,
VerticalTextAlignment = TextAlignment.Center
};
Content = new StackLayout
{
Orientation = StackOrientation.Vertical,
HorizontalOptions = LayoutOptions.Center,
VerticalOptions = LayoutOptions.Center,
Spacing = 15,
Children =
{
new Label
{
Text = "Click Push to show a ListView. When you hit the Back button, Counter will show the number of pages that have not been finalized yet."
+ " If you click GC, the counter should be 0."
},
Label,
new Button
{
Text = "GC",
AutomationId = "GC",
Command = new Command(o =>
{
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
Label.Text = "Counter: " + Counter;
})
},
new Button
{
Text = "Push",
AutomationId = "Push",
Command = new Command(async o =>
{
await Navigation.PushAsync(new ContentPage43941());
})
}
}
};
}
protected override void OnAppearing()
{
base.OnAppearing();
if (Label != null)
Label.Text = "Counter: " + Counter;
}
}
}
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