Comments on: iPhone Programming Tutorial – Animating a Ball Using An NSTimer

By: Don

Don — Sun, 22 May 2011 19:37:00 +0000

A useful animation library for iOS:

http://www.modejong.com/AVAnimator/

By: » Blog Archive » 10å®¶ä¸é”™çš„iphoneç¼–ç¨‹èµ„æºç«™

» Blog Archive » 10å®¶ä¸é”™çš„iphoneç¼–ç¨‹èµ„æºç«™ — Tue, 04 Jan 2011 04:01:32 +0000

[…] 2.Â Animating a Ball Using An NSTimer ä»Šå¤©æˆ‘å°†å‘ä½ å±•ç¤ºå¦‚ä½•é€šè¿‡ç§»åŠ¨å±å¹•ä¸Šé¢çš„çƒæ¥åšä¸€äº›ç®€å•çš„åŠ¨ç”»ã€‚æˆ‘ä»¬ä¸ä¼šç”¨åˆ°OpenGL ESæ¥å®Œæˆè¿™äº›ï¼Œè€Œåªç”¨ç®€å•çš„NSTimerå’ŒUIImageViewã€‚ See the TutorialÂ here. […]

By: Ashish

Ashish — Mon, 30 Aug 2010 13:04:16 +0000

you are master blaster. very good way of elaborating this video.

By: Corwin

Corwin — Sun, 22 Aug 2010 11:57:43 +0000

Ya, just dynamically allocate each of the UIImageView s and set the attributes with code. Just call each of your image views in the code instead of just one

By: Ben

Ben — Sat, 31 Jul 2010 03:37:52 +0000

This was simple and to the point! A great help, thanks!

By: nataraj

nataraj — Fri, 30 Jul 2010 08:54:36 +0000

tumba chennagide!!!!!!…..

By: akash

akash — Fri, 30 Jul 2010 08:52:43 +0000

nice one…….

By: David

David — Wed, 07 Jul 2010 03:59:51 +0000

Thanks for all the time and work you put into these tutorials.
I’m sure you realize how valuable they are to beginning programmers, otherwise you would not create them, and they would not be as illuminating as they are.

Its amazing to discover how easy some of these seemingly complicated techniques can be
when explained by someone who knows what it is like to be a beginner.

I read the Apple SKD reference documents for NSTimer and associated reference material, and it seems much more complicated and involved than what you have demonstrated.
This is why web sites like yours are so valuable. It separates the wheat from the chaff so a beginner can grasp the core underlying principle of the subject.

Technical documents are important and necessary but they are no way to learn how to program. They are written by engineers for engineers. Whenever I read the reference documentation from Apple I come away more confused than when I started.

Your tutorials put me on the right track. Thanks again.

By: Ham

Ham — Wed, 07 Jul 2010 01:04:38 +0000

Code update for 3.2, shows how to construct NSInvocation.
- (void)viewDidLoad { pos = CGPointMake(14.0, 7.0);


	SEL selector = @selector(onTimer);
	NSMethodSignature *aSig = [self methodSignatureForSelector:selector];

	NSInvocation *anInvo = [NSInvocation invocationWithMethodSignature:aSig];
	anInvo.selector = selector;

	anInvo.target = self;

[NSTimer scheduledTimerWithTimeInterval:0.05 invocation:anInvo repeats:YES]; // [super viewDidLoad]; }

By: la martina

la martina — Wed, 07 Apr 2010 15:43:27 +0000

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