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COCOA TOUCH TUTORIAL: IPHONE APPLICATIONEXAMPLE

1OCT2008

Cocoa Touch

iPhone

iPod Touch

Objective-C

by Matt Long

Similar to one of my first blog posts on building a basic application for Mac OS X using xcode 3.0,I am going to explain for beginning iPhone/iPod Touch developers how to build the most basicCocoa Touch application using Interface Builder and an application delegate in xcode 3.1. Thistutorial post is really to provide a quick how-to. I won’t go into any depth explaining why things aredone the way they are done, but this should help you get up and running with your firstapplication pretty quickly so that you too can clog the App Store with useless superfluous apps(kidding… just kidding).

If you are a visual learner, it may be helpful to you to instead watch a video presentation of this tutorial. I’ve posted it onthe site, but you’ll have to click the link to see my Cocoa Touch Video Tutorial. Understanding Cocoa programming ismuch simpler if you learn MVC, Model, View, Controller. You can probably step through code examples and figuresome things out without learning MVC, but I wouldn’t recommend it. Go Google it and read up on it.

I will say as an introduction to MVC for those who are not familiar that it should probably be called (Model <-->Controller <--> View) or (View <--> Controller <--> Model) as the controller always sits between the other two. Yourcontroller is either telling your model to update its data or it is telling the view to update its display. That’s the crux ofthe whole paradigm. The details run much deeper, but that’s how I will nutshell it for you.

Create Your Application

Let’s get started. Create a Cocoa Application using the following steps:

1. Select File > New Project…, under the iPhone OS templates choose Window-Based Application in the ensuingdialog. Click Choose…

Search...

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2. Enter ‘Basic iPhone App’ as the project name. Click Save

You should see a project workspace like the following:

The next thing you should do is create a class to act as your controller or delegate.

Delegate == Controller

The words delegate and controller can be used synonymously. You’ll see later that we delegate the work of thedifferent controls we create in Interface Builder to a delegate or controller class. In the iPhone template projects, thisapplication delegate is created for you. Our app delegate has been named Basic_iPhone_AppAppDelegate.

In our app delegate class we need to add what Cocoa developers refer to as outlets and actions. I could spend anentire post explaining these two things in depth, but for the sake of brevity and walking you through the steps to buildyour first application, the definition will have to suffice.

Outlets represent controls in your user interface that can have some action performed upon them. Action arefunctions in your code that are connected to controls in your user interface such as a button or a drop down list.When connected to a button for instance, the action code will be run when the user clicks the button.

In xcode, open your app delegate header file Basic_iPhone_AppAppDelegate.h. Add an outlet for the text field and thelabel below the window outlet as in the following snippet:

1 @interface Basic_iPhone_AppAppDelegate : NSObject <UIApplicationDelegate> {

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You will also want to add an action that will be performed when our button is clicked. Add that below the property forour window:

Now switch over to the implementation file, Basic_iPhone_AppAppDelegate.m. Add the click: action below ourapplicationDidFinishLaunching: function:

We will actually add some code to do something in the click: action handler, but first we need to hook it up to the userinterface in Interface Builder.

Interface Builder And Controller/Delegate Implementation

Now that you’ve specified the outlets–a UITextField and a UILabel and an action called click:, you will see these itemsavailable for connecting to the UI in Interface builder. Let’s open Interface Builder and make the connections we needusing the following steps:

1. In your xcode workspace, expand the folder in the tree view called Resources and double click the file called‘MainMenu.xib’.

Note:: A .xib is a .nib that uses XML for the internal data structure.

This will open the xib file in Interface Builder2. Once Interface Builder loads, you will notice that there is an object representation of our app delegate in the

MainWindow.xib window. This is the object you will use to create connections for your actions and outlets.

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IBOutlet UIWindow *window; IBOutlet UITextField *textField; IBOutlet UILabel *label;}

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@interface Basic_iPhone_AppAppDelegate : NSObject <UIApplicationDelegate> { IBOutlet UIWindow *window; IBOutlet UITextField *textField; IBOutlet UILabel *label;} @property (nonatomic, retain) UIWindow *window; - (IBAction)click:(id)sender;

12345678910

- (void)applicationDidFinishLaunching:(UIApplication *)application { // Override point for customization after app launch [window makeKeyAndVisible];} - (IBAction)click:(id)sender;{ }

Cocoa Touch Tutorial: iPhone Application Example | Cocoa Is My GirlfriendCocoa Is My Girlfriend

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Design The User Interface

Now you need to add the controls to the main window in Interface Builder and then we can connect the action andoutlet accordingly. To finish the interface, complete the following steps:

1. Make sure that the Object Library is open by selecting Tools | Library from the menu in Interface Builder.2. Drag a TextField, a Label, and a Button to the main window so that the user interface looks like the screenshot

below:

3. Control-Click and drag from the Button to your app delegate object in the ‘MainWindow.xib’ window.

A pop-up will display. Select click:

Cocoa Touch Tutorial: iPhone Application Example | Cocoa Is My GirlfriendCocoa Is My Girlfriend

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4. Control-Click the app delegate object and drag it to the text field in the main window.

A pop-up will display. Select textField

5. Control-Click the app delegate object and drag it to the label in the main window.

A pop-up will display. Select label

That’s it for Interface Builder. You can quit interface builder and return to xcode. We have one more piece of code toadd and then our application will be finished.

Finishing Up

When the button is clicked, it will simply grab the text from the text field and place it into the label. That’s all theapplication does. Here’s the code you need. Just make your implementation of the click: action in theBasic_iPhone_AppAppDelegate.m file look like this:

Notice we are grabbing the text from the text field, and setting the text in our label with it. Now all you need to do isclick “Build and Go”. When the application runs the iPhone Simulator will be started. You will see the application load.Type some text into the text field and click the Change button. You will see the label update with the text from the textfield.

Next Steps

1234

- (IBAction)click:(id)sender;{ [label setText:[textField text]];}

Cocoa Touch Tutorial: iPhone Application Example | Cocoa Is My GirlfriendCocoa Is My Girlfriend

http://www.cimgf.com/2008/10/01/cocoa-touch-tutorial-iphone-application-example/[24/07/2013 10:45:05 a.m.]

This tutorial has just scratched the surface. It’s is intended to get you going quickly. For a more in-depth path to gaininga deeper understanding of iPhone development, take a look at Apple’s, Your First iPhone Application. You will need tolog in with your ADC account to see the article, but it is definitely worth while.

Conclusion

The limit with iPhone development is really just your imagination. It is an extremely fun platform to develop on and theresulting applications are very rewarding. Have fun with it and learn as much as you can. Just do me a favor and don’tclog the App Store with any more flashlight apps or tip calculators… Seriously ;-) . Until next time.

Basic iPhone Application Demo Project

Comments

titus says:

October 1, 2008 at 2:36 pm

Awesome thanks! Keep em coming :) Also thanks for the video tutorial. Thanks again! Titus

pligg.com says:October 3, 2008 at 7:27 amCocoa Touch SDK Tutorial: iPhone Application Example…

I am going to explain for beginning iPhone/iPod Touch developers how to build the most basic Cocoa Touchapplication using Interface Builder and an application delegate in xcode 3.1. This tutorial post is really to provide a

Matt Long

Matt Long works for Colorado Springs iOS Development shop, Skye Road Systems. He isthe founder and principal developer there. Matt also works for a startup company calledGalen Medical Systems where he develops apps for the medical industry. Contact Matt atMatt at CIMGF dot com to discuss your iOS software development needs. Matt is the co-founder of Cocoa Is My Girlfriend and is the co-author of "Core Animation: SimplifiedAnimation Techniques for Mac and iPhone Development"

More Posts - Website

Follow Me:

Cocoa Touch Tutorial: iPhone Application Example | Cocoa Is My GirlfriendCocoa Is My Girlfriend

http://www.cimgf.com/2008/10/01/cocoa-touch-tutorial-iphone-application-example/[24/07/2013 10:45:05 a.m.]

quick how-to….

Jash Sayani says:

October 4, 2008 at 6:50 am

Nice Tutorial. But how do you add the ability to Hide the keyboard when empty area is touched ? Also,making the Submit button on the keyboard act as the Change button would be nice….

Pls reply to the comment with the solution or post a Tutorial for it. Thanks a lot.

jigphone.com says:October 4, 2008 at 8:44 amCocoa Is My Girlfriend…

Cocoa Is My Girlfriend is a blog about programming and a passion for programming on the Macintosh. A lot ofgood Cocoa tutorials. One new post is a Cocoa Touch tutorial:

Taglines are for Windows programmers Cocoa Touch Tutorial: iPhone Application Exa…

esat says:

October 4, 2008 at 9:30 am

Thanks for you tutorial, it’s very good. Recomiendo este post Regards

Michael Meyer says:

October 4, 2008 at 10:40 pm

Awesome, thanks.

mattcass says:

October 8, 2008 at 2:18 pm

Dude, this is by far the best tutorial I’ve found yet! Talk about a doh moment when I realized you had to Ctrl-click using the MainWindow.xib!

Thanks a million and keep em coming! Matt

gonzonia says:

October 9, 2008 at 12:44 pm

I just downloaded the SDK today. I don’t know if there are changes, or differences in settings, but I had touse the following code in Basic_iPhone_AppAppDelegate.h to get it to work.

@interface Basic_Iphone_AppAppDelegate : NSObject { UIWindow *window; UITextField *textField; UILabel*label; }

Cocoa Touch Tutorial: iPhone Application Example | Cocoa Is My GirlfriendCocoa Is My Girlfriend

http://www.cimgf.com/2008/10/01/cocoa-touch-tutorial-iphone-application-example/[24/07/2013 10:45:05 a.m.]

@property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutletUITextField *textField; @property (nonatomic, retain) IBOutlet UILabel *label;

I understand the IBOutlet in the snippet is supposed to handle this, but for some reason it wasn’t working.Doing it this way worked.

Cocoa Touch Tutorial: iPhone Application Example | Phil Nelson says:October 26, 2008 at 11:01 pm[...] Very good intro to the platform. [...]

How to learn the Web development skills that will keep you working–Part 2 | Underpants Office says:October 27, 2008 at 2:51 pm[...] Cocoa Touch Tutorial: iPhone Application Example [...]

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x5.home » Blog Archive » [èœé¸Ÿç³»åˆ—]Cocoa Touch教程：iPhone应用程åºå®žä¾‹ says:November 9, 2008 at 10:45 am[...] 译者注：好久没有翻译了，好久没有看到这么通俗易懂的教程了，也好久没有更新Blog了。译文ä¸æˆ‘ä¿®æ£äº†ä¸€äº›åŽŸæ–‡ä¸-错误的è¯å¥å’Œå›¾ç‰‡ï¼Œå¦‚果想看原文，请点击这里。若å‘现任何翻译错误，欢迎在文末留言。 [...]

x5 says:

November 9, 2008 at 12:46 pm

Hi Matt Long,

I have translated this tutorial into Chinese (link).

This is really a awesome tutorial:)

All the best,

Liu Shen

Bericht vom iPhone TechTalk in Berlin » Tipps, Muster, Checklisten, News, Urteile für Online-Händler »shopbetreiber-blog.de says:November 13, 2008 at 12:37 am[...] Cocoa is my girlfriend [...]

mmalc.pip.verisignlabs.com/ says:

November 17, 2008 at 12:05 am

Sorry, but this seems to do less and explain less than the “Your First iPhone Application” tutorial on theiPhone Dev Center site — which also explains how to dismiss the keyboard…

Cocoa Touch Tutorial: iPhone Application Example | Cocoa Is My GirlfriendCocoa Is My Girlfriend

http://www.cimgf.com/2008/10/01/cocoa-touch-tutorial-iphone-application-example/[24/07/2013 10:45:05 a.m.]

Matt Long says:

November 17, 2008 at 9:53 am

@mmalc

Hadn’t even seen that tutorial before writing this. Though, for people who are completely new to the whole IBactions/outlets, etc. this tutorial cuts to the chase–which was my goal. This isn’t for a seasoned Cocoadeveloper such as yourself. ;-) I think I’ll link to that other one though as ‘next steps’. Thanks for pointing itout.

Thanks for the feedback.

-Matt

DarelRex says:

November 17, 2008 at 2:18 pm

Great tutorial!! I was able to follow the video perfectly, and I feel like I’m on my way to making an iPhone appalready.

Q: Do you know why a UIImageView set up in IB fails to appear when running the simulator? (“Hidden” isunchecked.) I’ve searched high and low and haven’t found an answer to this — you seem like a guy whowould know!

Thanks, Darel

iPhone Tutorials | Dr. Web Magazin says:November 21, 2008 at 2:17 am[...] Cocoa Touch iPhone-Tutorial Der ehemalige Windows-Programmierer Matt Long stellte eines der beliebtesteniPhone Tutorials ins Netz. [...]

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rwinchester says:

November 24, 2008 at 4:27 pm

Matt – Just a quick correction. The image where you want to show connecting delegate->label actuallyshows delegate->textField a second time. Copy-paste error? ;-)

iPhone Developer resources | MikkoLehtinen.com says:November 25, 2008 at 5:36 pm

Cocoa Touch Tutorial: iPhone Application Example | Cocoa Is My GirlfriendCocoa Is My Girlfriend

http://www.cimgf.com/2008/10/01/cocoa-touch-tutorial-iphone-application-example/[24/07/2013 10:45:05 a.m.]

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Jobbl » Blog Archive » links for 2008-12-11 says:December 12, 2008 at 12:01 am[...] Cocoa Touch Tutorial: iPhone Application Example A very nice tutorial from Matt Long on creating your firstiPhone application using Interface Builder. [...]

me.yahoo.com/a/FBZSexhlq says:

December 29, 2008 at 2:54 pm

Nice focused tutorial. Thanks!

@interface Basic_AppAppDelegate : NSObject had me stumped until I read an explanation at:

http://forums.tigsource.com/index.php?topic=3641.0

me.yahoo.com/a/FBZSexhlq says:

December 29, 2008 at 2:59 pm

that should read

@interface Basic_AppAppDelegate : NSObject \

john.buckingham says:

February 15, 2009 at 6:50 am

The bit that stumped me for a good while was in the ‘Design the User Interface’ where you say ‘simply…drag a text field’… This didn’t mean much until I opened ‘Library’ from the Tools menu in the Interfacebuilder. So I thought it may help other tyros if I commented.

Brillant Blog. Thank you…

Matt Long says:

February 16, 2009 at 10:59 am

@john.buckingham Good call. I’ve added that as a step in the UI design part of the tutorial. Thanks for thefeedback. That’s helpful.

-Matt

jrraines says:

Cocoa Touch Tutorial: iPhone Application Example | Cocoa Is My GirlfriendCocoa Is My Girlfriend

http://www.cimgf.com/2008/10/01/cocoa-touch-tutorial-iphone-application-example/[24/07/2013 10:45:05 a.m.]

March 1, 2009 at 9:31 am

My primary work is not in IT but sometimes when I go on vacation I will write a little program, usually for anew device I’ve bought. Off course when I go on vacation I’m usually off the grid enough so that I don’t haveaccess to fast downloads, etc. This time I had fast enough access to download megabytes of web pages orPDF’s but not the full 1.7 GB iPhone SDK. I just got back from vacation and reinstalled the iPhone SDK. Thething is when I start up XCode I don’t see the list of application types (ie. Window-based) you show. I don’tsee the iPhone as an available SDK under the project menu. So it isn’t that I neglected to install what tools Ineeded before I left. I’ve reinstalled them and they aren’t where the tutorial implies they should be. Anyway,vacation’s over I’m frustrated butthere’s little help anyone can give me because my opportunity is GONE.

jeszlinger says:

March 1, 2009 at 11:33 pm

very goo…I have one problem. On the control click drag part of the making of the app. I can not drag t to thetextbox, label, and button. It only lets me outpt drag to the whole entire window…please help me or emailme at jeszlinger@lycos.com

me.yahoo.com/a/fND0Kld.r… says:

March 7, 2009 at 7:53 pm

Thanks for the tutorial! I found it very helpful and clear. I decided to expand on your example a bit by makingthe text box into a site search. It replaces the Label with a UIWebView and builds a very simple results page:

http://www.hawkee.com/snippet/5833/

johndunne says:

May 9, 2009 at 6:16 am

Really good job! Thanks man,….

100 Free Courses & Tutorials for Aspiring iPhone App Developers | c'est la vie says:December 31, 2009 at 8:42 am[...] Cocoa Touch Tutorial: iPhone Application Example: This tutorial will show you how to make a very basic CocoaTouch application with Interface Builder. [Cocoa Is My Girlfriend] [...]

5 Tutorials to Develop Apps for iPhone « TECHniques says:January 1, 2010 at 10:35 pm[...] Cocoa Anyone? [...]

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http://www.cimgf.com/2008/10/01/cocoa-touch-tutorial-iphone-application-example/[24/07/2013 10:45:05 a.m.]

Sara says:

January 16, 2010 at 7:04 pm

Thank you this is fantastic, I’ve read several books from pages 1-350, and all I needed was this brilliantconcise, clear explanation. Without blinding me with the science, you have complied a clear demonstrationon your video and all I can say is, AWESOME! I really want Cocoa to be my boyfriend…..But I need tounderstand him first…..Do you have any more tutorial or samples i.e. how to include the fundamental codeslike scrolling, keyboard bounce back, memory codes and so forth? Be grateful for some resources, tipsetc….THANK YOU!

The Ultimate Toolbox for iPhone Development | c'est la vie says:February 1, 2010 at 8:53 pm[...] Cocoa Touch Tutorial: iPhone Application Example This tutorial covers how to develop Cocoa iPhone appsusing Interface Builder to quickly build your first application. [...]

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Where’s the best site to read up on apple iphone apps? | Apple iPhone says:March 2, 2010 at 3:06 pm[...] far as creating your own app, read this article: http://www.cimgf.com/2008/10/01/cocoa-touch-tutorial-iphone-application-example/. It will give you some of the [...]

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yabeweb says:

May 11, 2010 at 2:21 pm

i would like to know if anyone can teack me how to build an app that with a press of a button it reads in a

Cocoa Touch Tutorial: iPhone Application Example | Cocoa Is My GirlfriendCocoa Is My Girlfriend

http://www.cimgf.com/2008/10/01/cocoa-touch-tutorial-iphone-application-example/[24/07/2013 10:45:05 a.m.]

database and display a random word i have inserted in that database on my interface

Let’s say i put

Andrea John Michael

in my database ad if i press the button it shows randomly one of the 3….also what kind of database would ibetter use?

Thanks in advance.

Keep in mind i am a complete newbie so a spet by step guide would be awesome (if honest i can pay asmall ammount for the tutorial :)

Thanks

Andrea

Matt Long says:

May 11, 2010 at 3:02 pm

Andrea,

What you are asking for would require more than a step by step tutorial. You really have to get down tobasics of programming first and then step up from there. Creating an application that does what you areasking it fairly trivial to a seasoned programmer, but if you’ve never written code before, you’re going to haveto crawl before you walk. In other words a step-by-step tutorial for what you are looking for exactly won’t helpyou unless you understand what each step means.

Here are a couple pointers. Learn to write iPhone apps first from Aaron Hillegass. Then you should look intoCore Data for storage. It would be perfect for what you are wanting to do.

Best regards,

-Matt

jaisula says:

June 29, 2010 at 3:17 am

Great tutorial, easy to follow up and most of all, it works. Nicely explained. Keep up the good work :)

Regards, Kamil

mohitkshirsagar says:

August 23, 2010 at 2:29 am

this is a great tutorial. I understood the concept of iphone app development here better than any other

Cocoa Touch Tutorial: iPhone Application Example | Cocoa Is My GirlfriendCocoa Is My Girlfriend

http://www.cimgf.com/2008/10/01/cocoa-touch-tutorial-iphone-application-example/[24/07/2013 10:45:05 a.m.]

website. I am very new to this and i need a little guidance on developing a very simple app. This app hassliders only. I have built the interface but have no idea where to start with for the coding.

I want to tie up one or more sliders. So if i move one slider the other moves accordingly. Each slider has adifferent range. This sort of a calculator i am trying to create. I would appreicate if you could guide me as towhere to begin.

Mohit

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codefrux says:

March 16, 2011 at 4:23 am

helpful post, keep posting on Cocoa Touch & Xcode codefrux http://www.codefrux.com

iPhone SDK Developer’s Tutorials | RnR Software Technologies says:April 17, 2011 at 9:57 pm[...] Cocoa Touch Tutorial: iPhone Application Example – Explaining for beginning iPhone/iPod Touch developershow to build the most basic Cocoa Touch application using Interface Builder and an application delegate in xcode3.1 [...]

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tedtom says:

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http://www.cimgf.com/2008/10/01/cocoa-touch-tutorial-iphone-application-example/[24/07/2013 10:45:05 a.m.]

April 26, 2011 at 5:39 pm

This is an awesome tutorial. I read so many blogs to get started but all of them lacked proper explanation..this one really cleared all my doubts..

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