Worked it out in the end. You can do it this way:
using MonoTouch.UIKit;
namespace Your.Namespace
{
public class NavigationControllerDelegate :
UINavigationControllerDelegate
{
public bool Transitioning = true;
public override void
DidShowViewController (UINavigationController navigationController,
UIViewController viewController, bool animated)
{
this.Transitioning
= false;
}
}
}
And do this on each PopViewControllerAnimated:
NavigationControllerDelegate navigationControllerDelegate = new
NavigationControllerDelegate();
navigationController.Delegate = navigationControllerDelegate;
navigationController.PopViewControllerAnimated(true);
while (navigationControllerDelegate.Transitioning)
NSRunLoop.Current.RunUntil(DateTime.Now.AddMilliseconds(50));
navigationController.Delegate = null;
But rather than do that everywhere, I created this extension method (using the
above delegate class):
using System;
using MonoTouch.Foundation;
using Your.Namespace;
namespace MonoTouch.UIKit
{
public static class NavigationControllerExtension
{
public static UIViewController
PopViewControllerAnimatedPause(this UINavigationController
navigationController, bool animated)
{
if (animated)
{
NavigationControllerDelegate existing = navigationController.Delegate ;
NavigationControllerDelegate navigationControllerDelegate = new
NavigationControllerDelegate();
navigationController.Delegate = navigationControllerDelegate;
UIViewController result = navigationController.PopViewControllerAnimated(true);
while (navigationControllerDelegate.Transitioning)
NSRunLoop.Current.RunUntil(DateTime.Now.AddMilliseconds(50));
navigationController.Delegate = existing;
return result;
}
return
navigationController.PopViewControllerAnimated(false);
}
}
}
Now all I have to do is call "PopViewControllerAnimatedPause(true);" and it's
all handled for me.
Dino
From: [email protected]
[mailto:[email protected]] On Behalf Of Dean Cleaver
Sent: Friday, April 13, 2012 1:42 PM
To: [email protected]
Subject: [MonoTouch] Nested push animations
Hi,
I'm getting some nested push animation errors when transitioning between
screens, and I'm not sure how I can prevent it nicely. Basically:
1. I push a screen that the user fills in.
2. I pop the screen animated.
3. I call other code that depending on circumstances, may or may not show
a UIActionSheet or another UIView animated.
On showing the UIActionSheet or UIView I get the nested animation problems.
Now, I can pop the screen not animated in step 2, but it looks rather abrupt if
step 3 doesn't show any other UI elements. What I'm looking for is a way to
detect that the pop in step 2 has completed before I continue with step 3 - is
there an easy way to detect that its completed?
Dino
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