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Re: Original iPhone animation performance
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Re: Original iPhone animation performance


  • Subject: Re: Original iPhone animation performance
  • From: Andrew <email@hidden>
  • Date: Thu, 20 May 2010 10:51:26 +1200

Hi Ricky,

that is interesting, for some reason I assumed that the presentation layer would take care of caching the presented view.

ok, I will try that and see how it goes, thanks.


is there anything else you can think of that might make a difference?


- Andrew Bush


>
>> Im writing some code to animate an image moving up the display, just a simple thing moving from the bottom to the top.
>>
>> the image is 75x75, and Im displaying that in a CALayer sized to 45x45 by setting its .contents property to the .CGImage of the UIImage.
>
> This could be the issue.  On iPhone OS, try your best not to scale any images repeatedly.  Thus, you should create an alternate version of your image at 45 x 45 and then animate that.
>
>> on the newer phones this runs very smoothly, even if I have more than one of those CALayers animating at once, but on an older (original) iPhone I am testing on the animation is slightly rough/jerky even with only a single image moving.
>>
>>
>> The iPhone is running 3.1.3 and I am performing the animation using this code:
>>
>> CABasicAnimation* animation = [CABasicAnimation animation];
>> animation.keyPath = @"position.y";
>>
>> CGFloat from=self.position.y;
>> CGFloat to=self.position.y-[self.calculator distanceForAnimationStartingAt:from];
>>
>> animation.fromValue = [NSNumber numberWithFloat:from];
>> animation.toValue = [NSNumber numberWithFloat:to];
>>
>> CGFloat distance=to-from;
>>
>> animation.duration = [self.calculator timeToTravelDistance:distance];
>> animation.repeatCount = 1;
>> animation.autoreverses = NO;
>> animation.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionEaseInEaseOut];
>> animation.removedOnCompletion = NO;
>> animation.fillMode = kCAFillModeForwards;
>> animation.delegate=self;
>> [self addAnimation:animation forKey:@"animateUp"];
>>
>>
>> so, obviously the older phone is basically just less capable, but is it likely to be possible to smooth things out?  are there any known tricks or things I can do that might improve things on the older hardware?
>>
>>
>> Thanks for any help.
>>
>>
>> - Andrew Bush
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>>
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>
> ___________________________________________________________
> Ricky A. Sharp         mailto:email@hidden
> Instant Interactive(tm)   http://www.instantinteractive.com
>
>
>


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References: 
 >Original iPhone animation performance (From: Andrew <email@hidden>)
 >Re: Original iPhone animation performance (From: Ricky Sharp <email@hidden>)

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