Chase, thank you for your responses. I actually tested both your code and the code of Gustavo. For me the result was the same - the opacity changes back to 1.0 when the animation had finished and then i hide it, which still causes blinking... Before the animation starts, i need to set the opacity to 1.0 for your code - the "animator" uses it as starting value (and the final value is specified by the line alphaAnimation.toValue = [NSNumber numberWithFloat:0.0];).
So, since in the Layer Tree the opacity is 1.0, after the animation finishes, the view becomes opaque again. The only thing that worked for me was [[[myView] animator] setAlphaValue:0.0], which did not end up with the opacity 1.0 after animation had finished, but i need to use a timer to hide the view. I only was thinking there would be a "simpler" solution. Well, i guess i made up a big problem from a little desire to make my application to look more "alive" to the user :-) Here is a full code that ends up with the opacity 1.0 (instead of 0.0 as i needed to have) CABasicAnimation * alphaAnimation = [CABasicAnimation animationWithKeyPath: @"opacity"]; alphaAnimation.delegate = self; alphaAnimation.removedOnCompletion = YES; alphaAnimation.autoreverses = NO; alphaAnimation.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseInEaseOut]; alphaAnimation.duration = 1.0f; alphaAnimation.toValue = [NSNumber numberWithFloat:0.0]; [[theView layer] setOpacity:1.0]; [[theView layer] addAnimation:alphaAnimation forKey:@"opacity"]; 2011/5/20 Chase Latta <chasela...@gmail.com> > Did you try making that change in your code? If yes, is your view layer > backed? > > I work mainly on iOS so I could be missing something but the code worked > without blinking for me on 10.6. > > What is happening, as I think I understand it, is that by setting the > opacity of your view's layer to 0.0 you trigger the implicit animation for > opacity. But if you add an animation for the opacity key path that animation > will be used. What you are doing is simply adding an animation. When it > finishes it jumps back to the original value before you hide it. You need to > set the opacity of your layer to zero at some point in your code. The > animation that you see is actually the animation of the presentationLayer. > > I could be wrong on how all this works but my quick test does not cause the > view to blink. > > Chase > > > On May 20, 2011, at 12:26 PM, Nick <eveningn...@gmail.com> wrote: > > Chase, > the animation itself worked and works - either with your code or with > Gustavo's. > > But after the animation finishes, the opaqueness of the view again becomes > 1.0 again. Then the "animationDidStop" gets called and the view disappears. > But before disappearing, it annoyingly blinks (so, the opaqueness changes > like this: 1.0, 0.9, 0.8, ..., 0.1, *1.0*, hidden). > > I am wondering *how could i make it save the final state of the animation* - > to remain transparent when the "animationDidStop" callback gets called - > which will allow the view not to blink. > > I understand (i hope i do :-) ) that i am actually changing the opaqueness > of the layer (i.e., of the temporary graphical representation) and not of > the view itself, but maybe i could get rid of blinking somehow. > Thank you! > > 2011/5/20 Chase Latta < <chasela...@gmail.com>chasela...@gmail.com>: > >> How could i force the animation to actually change the alpha value > >> from 1.0 to 0.0 and make it stay 0.0 unless i change it back? > > > > Change your code to look like this: > > > > CABasicAnimation * alphaAnimation = ... > > ... > > [[theView layer] setOpacity:0.0]; // Set your opacity here > > [[theView layer] addAnimation:alphaAnimation forKey:@"opacity"]; > > // Note the key > > } > > > > By setting the key to @"opacity" instead of @"opacityAnimation" your > > animation will used instead of the default animation when you call > > [CALayer setOpacity:]. > > > > There is a good WWDC talk about animation on the ipad that addresses > > this. I don't remember the exact talk, though. > > > > Chase > > > > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
