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

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

I organize this collection to be unequivocally useful. I am using it in a report I am article at college. la martina

By: Shubhojit

Shubhojit — Wed, 31 Mar 2010 14:45:20 +0000

I am very new to iPhone programming. I am looking for a tutorial like where we can scale objects on the screen when they are touched and then once the user lifts the finger then it stops. wonder how to do that any suggestion please help.

By: Lin

Lin — Wed, 31 Mar 2010 00:11:48 +0000

Memory leaks…

By: T#026 – Creiamo un’Animazione di una Palla con un NSTimer (by iCodeBlog) | devAPP

Mon, 01 Mar 2010 09:38:47 +0000

[...] tradurre e proporre ai nostri utenti i suoi tutorial e le sue guide. In questo nuovo tutorial, di brandontreb, vedremo come creare una semplice applicazione in cui una palla si muoverà automaticamente e [...]

By: Troy

Troy — Sat, 16 Jan 2010 19:30:29 +0000

Awesome tutorial! The only problem I’m having is its when I go to drag the new reference thing it only lets me choose View, not ball. What did I do wrong? Thanks!

By: Keyur Patel

Keyur Patel — Fri, 08 Jan 2010 18:30:59 +0000

@geniexy2132 Yes, you can programmatically add an image instead of doing it through Interface Builder. First just create an UIImageView in your .h file and add a property and synthesize it in the .m. Note you do not have to do an IBOutlet. To add the image go to the .m file and add

ball.image = [UIImage imageNamed:@"ball.png"];

That’s it.

By: Northstreamer

Northstreamer — Mon, 04 Jan 2010 17:06:11 +0000

Hi!

Great tutorial! I just have question…I have made my first app now and I really have no idea how to export it to iTunes and then to my iPhone. Would be really happy with an answer. Please notify me via email if you answer this post. Thanks!

By: geniexy2132

geniexy2132 — Sat, 02 Jan 2010 23:01:24 +0000

can you programatically add the image of the ball instead of adding it through interface builder?

By: Dan

Dan — Thu, 03 Dec 2009 13:08:13 +0000

Thanks a stack for these tutorials. These are real ‘light at the end of the tunnel’ tuts. I can’t tell you how good it was to find this site: your efforts are MUCH appreciated!!

By: Pete

Pete — Wed, 25 Nov 2009 12:02:20 +0000

awesome tutorial, its just given me an insight into how powerful the built in functions are and how easy it is to animate. I am new to iphone app development and its tutorials like this that keep me pushing on. thanks.

By: Michael

Michael — Mon, 09 Nov 2009 20:45:46 +0000

Hi! I really like this tutorial! But I am wondering how o make multiple balls. I want to see 4 ball in my screen moving!

Please help in this!

Thanks!

By: neilio

neilio — Sun, 18 Oct 2009 16:05:29 +0000

Hi Brandon

Ive found your tutorials very useful, but im having trouble with this one. Ive tried it a few times and im get 5 errors every time. Is this tutorial on an old version of the sdk. I have the most up to date version. Have been able to get others to work, but this just wont…

Thanks

By: preNo0b

preNo0b — Tue, 18 Aug 2009 23:20:03 +0000

Excellent tutoial! How would i go about making the ball react to touch? as in the ball bounces off the area touched.

By: mart

mart — Wed, 24 Jun 2009 10:51:53 +0000

Hi,
thank’s for the tutorial,
I’m am a new developer I’m using iphone sdk to develop a kind of sudocku application. I would like to have sugestion how to implement and controll my table with many rows and coloms.

By: Marshall

Marshall — Fri, 19 Jun 2009 01:53:08 +0000

Nice tutorial, you make it look easy.

By: Matt Mullally

Matt Mullally — Thu, 18 Jun 2009 14:51:38 +0000

Excellent job Brandon, just starting iphone development and your tutorials are fantastic. Thanks for taking the time and effort to put them in.

By: Pete

Pete — Mon, 15 Jun 2009 00:02:34 +0000

DOH!!! Should have looked directly above…. sorry

By: Pete

Pete — Mon, 15 Jun 2009 00:02:34 +0000

DOH!!! Should have looked directly above…. sorry

By: Pete

Pete — Mon, 15 Jun 2009 00:01:58 +0000

What if you wanted to add buttons on that view to start and stop the ball from moving? How would you stop the onTimer event?

By: Sam

Sam — Fri, 05 Jun 2009 19:59:11 +0000

Hi, just wondering how would you implement a start and stop button for this, so when the app starts the ball is stationary. But when a start button is pressed it starts moving Btw I’m an iphone SDK noob.

By: satish

satish — Tue, 19 May 2009 04:41:52 +0000

I think its difficult to write the games using this simple animation. Its like discovering the wheel again. Even for simple games v must write plenty of code. To learn about UIView animation its good way to design the games using UIView animation. If u guys really want to make games den v must use other technology isn’t it?

By: rich

rich — Wed, 29 Apr 2009 18:41:49 +0000

Hi,

Great tutorials, keep up the good work.

Only one issue with this, ive followed the tutorial closely & downloaded the sample code. Both seem to build in xcode, but when the simulator launched the app, the simulator quits unexpectedly?

Any suggestions, anyone?

Thanks

By: 精彩生活 » 博客文章 » iPhone编程资源站

精彩生活 » 博客文章 » iPhone编程资源站 — Wed, 29 Apr 2009 03:34:47 +0000

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