Re: Layer Backed Views and CoreAnimation neither animate nor stay in place

[Brian Christensen]

On Jun 27, 2008, at 08:56, Chilton Webb wrote:

(3) Even when everything else is working right, the first time I perform my animation method, the animation does not work. Instead, it quickly swaps out the old view with the new one, and displays it in the foreground, on top of all other views, even if all other views are layer backed. This is obviously *not* 'replacing' the view in the order I want. After that, it animates properly, but on top of the other views instead of behind them.

- (IBAction) testSwap:(id) sender
{
        // (2) If I set this anywhere else, the animations don't work.
//      [self setWantsLayer:YES];

        // (3) See notes above


        [svx setColor:[self anothercolor]];

        
        NSView *viewToReplace = [[self subviews] objectAtIndex:1];

        [[viewToReplace animator] removeFromSuperview];
        
        [svx release];
}

It looks like you'll have to add this as well:

- (void)awakeFromNib
{
        [self setWantsLayer:YES];
}



[NSAnimationContext beginGrouping];
[NSAnimationContext setDuration:0.5];

[[svx animator] setFrameOrigin:destinationFrameOrigin];


[NSAnimationContext endGrouping];





/brian

I'm surprised it doesn't work as intended. Maybe it's a bug in the replaceSubview:with: method. If you change your testSwap: method to the following it should maintain the view ordering: ColoredSubView *svx = [[ColoredSubView alloc] initWithFrame:NSMakeRect(50,50,200,200)]; // [[self animator] replaceSubview:[[self subviews] objectAtIndex:1] with: svx]; [[self animator] addSubview:svx positioned:NSWindowAbove relativeTo:viewToReplace]; Your transition probably won't work as intended with this solution though (it works fine with the default fade animation, however), so to get the effect you want you may need to position the new view outside the visible boundaries of the superview and then use something like this to perform the transition: [[viewToReplace animator] setFrameOrigin:somewhereOutsideVisibleBoundaries]; [viewToReplace performSelector:@selector(removeFromSuperview) withObject:nil afterDelay:0.5]; (I'm not sure that the transition you specified would work with replaceSubview:with: either. It seems to perform the animation on the entire superview, not just the subview being changed.)

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