Fix ListViewItem cannot find parent in iOS mode

[HaoLife]

GitHub Issue (If applicable): #

#598

PR Type

Fix ListViewItem cannot find parent in iOS mode

What is the current behavior?

What is the new behavior?

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Docs have been added/updated which fit documentation template. (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Wasm UI Tests are not showing unexpected any differences
• Contains NO breaking changes
• Updated the Release Notes
• Associated with an issue (GitHub or internal)

Other information

Internal Issue (If applicable):

[carldebilly]

Is there a way you can make a unit test / sample to expose the problem its fix?

[HaoLife]

All right, I'll add an sample to illustrate the fix of the problem.

[HaoLife]

NameScope.FindInNamescopes cannot find parent's ListView object in iOS
This fix is to solve this problem.

	internal static object FindInNamescopes(DependencyObject caller, string name)
	{
		var parent = caller;
		while (parent != null)
		{
			var scope = NameScope.GetNameScope(parent);
			var target = scope?.FindName(name);

			if (target != null)
			{
				return target;
			}

			parent = parent.GetParent() as DependencyObject;
		}

		return null;
	}

[davidjohnoliver]

All right, I'll add an sample to illustrate the fix of the problem.

Please make sure the sample follows the guidelines here, so it can be automatically found by the samples app: https://github.com/nventive/Uno/blob/master/doc/articles/working-with-the-samples-apps.md

[davidjohnoliver]

@HaoLife This is looking good now, you just need to fix up the merge conflicts and it's ready to go.

[davidjohnoliver]

/azp run

[davidjohnoliver]

Seems like the latest merge didn't work - there shouldn't be so many changes, and there shouldn't be hard-coded paths.

[davkean]

I've filed a bug internally for this, looks like this is a regression in Visual Studio.

[davidjohnoliver]

Also the solution file shouldn't be changed.