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The Road to Code: Nice and Gooey

Volume Number: 24 (2008)
Issue Number: 04
Column Tag: The Road to Code

The Road to Code: Nice and Gooey

Writing your first Cocoa GUI interface

by Dave Dribin

Graphical User Interfaces

This is the tenth article in The Road to Code, and we have yet to write an application with a graphic user interface, or GUI. We've stuck to writing command line applications, which may seem strange, given that Mac OS X is considered one of the best GUI environments. But, as with learning many complex topics, you've got to learn the basics before moving on to the more advanced topics. Well, you'll be happy to know that we finally reached the point where we can start writing GUI applications for Mac OS X in Objective-C. Congratulations!

Leopard Only

A word of warning before getting too deep: now that Mac OS 10.5 (Leopard) is available, I will be writing all examples in Xcode 3 and Interface Builder 3, the new integrated development environment, or IDE, that comes with Leopard. This will not only affect Interface Builder screenshots and instructions, but the code will also be targeted to Leopard, as well. I will be making liberal use of Objective-C 2.0 properties, fast enumeration, and garbage collection. These new features can simplify code and make it more readable, so I think all new code going forward should take advantage of them. Since we haven't gone over these topics outside of the Leopard Detour article, I'll be going over them in more detail as we come across them. If you don't have Leopard or want to target previous version of Mac OS X, the simple examples we'll be going over for the time being can be built with minor modifications on Xcode 2.4.1 and Interface Builder 2.5. I'll try to point out any potential areas that are not backward compatible.

With the technicalities out of the way, let's get started. Open up Xcode 3 and select the File > New Project... menu. Choose Cocoa Application as in Figure 1.

Figure 1: New Cocoa application project

Name the project Hello World and click Finish. So far, this is the same as creating a new Foundation Tool application as we have been doing previously. However, this project has a different layout than command line tools. If you open some of the disclosure triangles in the Groups & Files section on the left, you should see a list of files similar to those shown in Figure 2.

Figure 2: Cocoa Application default files

You'll notice it creates more than the single .m file that we have seen thus far. It creates a main.m source file and a few other resources. We'll talk about all these files in a second, but it turns out that this program is ready to run. So let's not waste anymore time and see what Xcode gives us by default. If you select Build and Go from the toolbar or Run > Run from the menu bar, this will start our new application. You will get a new empty window, as in Figure 3.

Figure 3: Hello World window

That's pretty basic, but it's a fully functional Cocoa GUI application. You even get a menu bar, as shown in Figure 4. In fact, you need to quit our application to return to Xcode so choose Hello World > Quit NewApplication to do this now.

Figure 4: Hello World menu bar

You many have noticed the "NewApplication" text in the Hello World menu, as shown in Figure 5. Xcode doesn't setup the menus with the name of our application automatically. But don't fret, we can edit the menus to our heart's content, and we'll change this text in a bit.

Figure 5: Hello World quit menu

Before going further, let's take a quick look at the source code that Xcode generates for us. There's only one source file and that's main.m. Select that to see what's inside. If you're expecting to see a bunch of code that sets up the menus and creates a window, you'll be sorely disappointed. Our main function is quite small. In fact it's only a single line:

Listing 1: main function for Cocoa applications

#import <Cocoa/Cocoa.h>
int main(int argc, char *argv[])
    return NSApplicationMain(argc,  (const char **) argv);

That's all the code running this application. The only other source file is the Hello World_Prefix.pch file, and this file is only used to help speed up compile times. It's called a prefix header and can generally be ignored. So where do the window and menus come from?

Interface Builder

If you look in the Resources group, you'll notice a file named MainMenu.nib. A nib file contains all the GUI components of a Cocoa application in a sort of freeze-dried state. These nib files cannot be edited in Xcode, however. There is a new application called Interface Builder for this. Double click on MainMenu.nib and Xcode will automatically open this file for you in Interface Builder. As a historic note, the nib file extension stands for NeXT Interface Builder and once again shows the NeXT lineage of Mac OS X.

Once this file is opened up in Interface Builder, you will be presented with a myriad of new windows. I've shown a bird's-eye view of all the windows in Figure 6.

Figure 6: Interface Builder windows

The two panel windows on the right are not part of our nib. The first one with the Window Identity title is the Inspector panel. This is how we change various attributes of our GUI components. The Library panel contains all the "parts" that we can add to our nib. The MainMenu.nib window contains all the "parts" that currently are part of our nib. Among these components you'll see MainMenu and Window. These correspond to the freeze-dried main menu and window of the Hello World application. The other two windows correspond to editable copies of the main menu and window of our application, which is how we change them.

Let's start by adding a text label to our window. You'll need to find the Label component in the Library. The easiest way to do this is to type "label" into the search field. Once you find it, drag it from the Library panel onto your Window, as shown in Figure 7.

Figure 7: Adding a label to our window

Now that you have the label placed in your window, you can change the text. Double click on it and change the text to "Hello World". You can also move the label anywhere you like, just by dragging. If you switch back to Xcode and run the application, the window should have our new label in it, as shown in Figure 8.

Figure 8: Running Hello World with the new label

See how easy that was? We were able to add a label to our application without even writing a single line of code. Interface Builder is a powerful GUI editor. As you start writing more complex GUI applications, you will be spending a lot of time in Interface Builder, as well as Xcode.

Changing the Menus

Before we start adding some custom code to our application, let's fix up the application name in the menus. Go back to Interface Builder and click in the window that looks like a menu bar. You should be able to open the menus and see all the menu items, just like a normal menu bar. However, you can now double click on the menus or menu items to change the text. For example, to change the text "About NewApplication" to "About Hello World," open up the NewApplication menu and double click on the About NewApplication menu item. You should now be editing the text, as shown in Figure 9. Change the text appropriately and hit Return.

Figure 9: Editing a menu

Now do the same with the Hide and Quit menu items, as well as the NewApplication menu in the menu bar. The final result should look like Figure 10.

Figure 10: Edited menu

If you now go back to Xcode and run the application, you should see our edited menus.


While you can do a lot using Interface Builder alone, you do end up having to write code that interacts with the user interface. Interface Builder provides ways to hook up parts of the user interface with code, as well. Let's add a button to our window, but first delete the label we added. Click on the label and delete it by pressing the Delete key. Now, we need to find a button in the Library. If you type "button" into the Library's search field, you will see a bunch of different button styles to choose from. The standard Cocoa button is called a Push Button and is the first one in the list, as shown in Figure 11. Drag the push button to your main window and change its text to "Press Me," as shown in Figure 12.

Figure 11: Buttons in the library

Figure 12: Press Me button

You can run the application as is, and you can even press the button, but nothing will happen. We need to hook up the button to some code so we can do something when the user presses it.

Let's create a new class in Xcode and name it HelloWorldController. Xcode will create the empty header and the implementation files, as usual. We're going to create a method that gets called when the button is pressed. Make the header and source file match Listing 2 and Listing 3, respectively, and save both files.

Listing 2: HelloWorldController.h

#import <Cocoa/Cocoa.h>
@interface HelloWorldController : NSObject
- (IBAction) pressMe: (id) sender;

Listing 3: HelloWorldController.m

#import "HelloWorldController.h"
@implementation HelloWorldController
- (IBAction) pressMe: (id) sender;
    NSLog(@"Button pressed");

This class contains one method, pressMe:, that prints a message to the console when called. This method has a very special signature. It returns a type called IBAction, and it takes one argument of type id. The IBAction return type is really the same as void, meaning there is no return value, with the exception that it marks this method as an action method for Interface Builder. We haven't yet covered the id type, but it's not really important for this discussion. We'll tackle id in a future article. What's important is that action methods take a single id argument.

Marking a method as an action method means you can access this method from Interface Builder. Before we can use it, we need to create an instance of HelloWorldController that Interface Builder can see. Go back to Interface Builder and search for "nsobject" to find the Object component in the Library. Drag this over to the MainMenu.nib window, as shown in Figure 13.

Figure 13: Adding an NSObject to your nib

Now go to the Inspector panel, and click on the Identity tab; it's the sixth tab from the left with the little "i" in a circle icon. Change the class to HelloWorldController and hit Return. The panel should now look like Figure 14. If Interface Builder does not allow you to choose HelloWorldController, be sure you've saved your files in Xcode.

Figure 14: Setting the class of an NSObject

You'll notice that once the class is set to HelloWorldController, the pressMe: method also shows up in the Class Actions section. If you don't see this action then double check your code to make sure you spelled everything correctly. By adding our object to the nib, we've created a freeze-dried instance of our class. This means that one instance of our class will automatically be created when the application starts.

With our object in place and our action visible to Interface Builder, we can hook up the action to our button. You do this by control dragging from the button to the Hello World Controller. By "control dragging" I mean you must press and hold the Control key while clicking and dragging. This action may be a bit strange, but you will use it a lot in Interface Builder. You should see a blue line follow your mouse as you drag. After you release the mouse button on top of our object, you'll get a popup window of possible actions you can connect the button to, as shown in Figure 15. Click on pressMe: and Interface Builder will flash a bit to confirm that it hooked up the action.

Figure 15: Hooking up a button to an action

That's it! You have now hooked up the button to our action method. Let's go back to Xcode and run our application to see if it worked. After our application launches, click the button a few times and check the console for any output. Xcode 3 no longer shows the Console window by default, but you can open it with the Run > Console command, or Command-Shift-R. If the action was properly hooked up in Interface Builder, you should see output in the console similar to this:

2008-02-06 10:43:15.479 Hello World[5864:10b] Button pressed
2008-02-06 10:43:16.079 Hello World[5864:10b] Button pressed
2008-02-06 10:43:19.479 Hello World[5864:10b] Button pressed

If you want to always see the Console window like previous versions of Xcode (I do), you can change this in the Xcode preferences. Under the Debugging tab, in the On Start popup, choose Show Console.

Figure 16: Received actions

Since actions are a two-way relationship, you can also verify this by viewing the connections of the button.

Push buttons are not the only GUI components that send actions. Menu items, checkboxes, radio buttons, and popup buttons all send actions. The procedure for hooking these up is always the same. Create an action method in your code and then control drag in Interface Builder to hook up a component to an action. Now that you know how to do it, I won't go over the detailed procedure in the future.


Actions are great, but that's only half the puzzle. We still need to be able to get information out of the GUI. If we have a text field, for example, we will probably want to use what the user entered into it. Let's cover that now.

Find the Text Field component in the Library by searching for "text field" and add it to the window by dragging it from the Library, just like we did with the label and button. Be sure not to mistakenly choose the Text Field Cell, which is not the same thing. Place the text field above the button, as shown in Figure 17.

Figure 17: Added text field

If we now run the application, you will be able to type into the text field, as you might expect. Getting what you type out of the text field requires some code. Back in Xcode, add an instance variable named _textField to our class, as shown in Listing 4, and save the file.

Listing 4: HelloWorldController.h with an outlet

#import <Cocoa/Cocoa.h>
@interface HelloWorldController : NSObject
    IBOutlet NSTextField * _textField;
- (IBAction) pressMe: (id) sender;

This instance variable is declared like any other instance variable, except it has the IBOutlet prefix before the type. Again, this is for integration with Interface Builder and marks this instance variable as an outlet. Outlets can be hooked up to GUI components in Interface Builder, and that's the next step.

Back in Interface Builder, control drag from the Hello World Controller to the text field. Again, when you release the button, you should get a popup window allowing you to select _textField, as shown in Figure 18. Choose _textField to make the connection. You can verify the connection by looking at the Connection tab of the Inspector panel, if you like.

Figure 18: Hooking up an outlet

With the outlet connection made, we can now use our _textField instance variable. It will automatically be set at application load time. You'll notice the type of _textField is NSTextField. This is the Cocoa class for text field controls. It has many methods, but the one we are interested in is stringValue. This method, unsurprisingly, returns the contents of the text field as an NSString. Modify our action method to log this value when the button is pressed, as shown in Listing 5.

Listing 5: HelloWorldController.m using an outlet

#import "HelloWorldController.h"
@implementation HelloWorldController
- (IBAction) pressMe: (id) sender;
    NSLog(@"Button pressed");
    NSLog(@"Text field is: %@", [_textField stringValue]);

Now run the application again. Type some text into the text field, such as "Hello!", and press the button. You should see text in the console window similar to:

2008-02-06 11:57:50.697 Hello World[6089:10b] Button pressed
2008-02-06 11:57:50.698 Hello World[6089:10b] Text field is: Hello!

You've just hooked up and used your first outlet! Outlets can be used to hook up any GUI component to your code. They are used quite a bit, as you will see once you start more Cocoa programming. With actions and outlets, we can create a real GUI application.

Rectangle Area Calculation

Let's bring back our old friend from a few articles ago, the Rectangle class. Add a new class named Rectangle to your application, and make sure the header and source files match Listing 6 and Listing 7, respectively.

Listing 6: Rectangle.h

#import <Foundation/Foundation.h>
@interface Rectangle : NSObject
    float _leftX;
    float _bottomY;
    float _width;
    float _height;
@property float leftX;
@property float bottomY;
@property float width;
@property float height;
@property (readonly) float area;
@property (readonly) float perimeter;
- (id)    initWithLeftX: (float) leftX
                bottomY: (float) bottomY
                 rightX: (float) rightX
                   topY: (float) topY;

Listing 7: Rectangle.m

#import "Rectangle.h"
@implementation Rectangle
@synthesize leftX = _leftX;
@synthesize bottomY = _bottomY;
@synthesize width = _width;
@synthesize height = _height;
- (id)    initWithLeftX: (float) leftX
                bottomY: (float) bottomY
                 rightX: (float) rightX
                   topY: (float) topY
    self = [super init];
    if (self == nil)
        return nil;
    _leftX = leftX;
    _bottomY = bottomY;
    _width = rightX - leftX;
    _height = topY - bottomY;
    return self;
- (float) area
    return _width * _height;
- (float) perimeter
    return (2*_width) + (2*_height);

This Rectangle class is similar to what we've used in previous articles, except that I've updated it with Objective-C 2.0 properties. In the header file, you'll see several @property lines. These declare properties and must match the following syntax:

@property (options) type name;

The type is any valid Objective-C type, such as C primitives or Objective-C classes. In our case, we're using the float primitive type. One of the options available is readonly. We used this on the area and perimeter properties. Another option is readwrite. This is the default, which is why we don't specify it on the rest of our properties. The @property declaration declares accessor methods for us. A readonly property declares a getter method only, while a readwrite property declares both a getter and a setter. Thus, this single line:

@property float leftX; is the same as declaring these two methods: - (float) leftX; - (void) setLeftX: (float) leftX;

There are other options, but we don't need to know about them just yet. It gets even better. Inside the source file, the @synthesize keyword generates method implementations for us. Thus, this single line:

@synthesize leftX = _leftX;
is the same as these eight lines of code:
- (float) leftX;
    return _leftX;
- (void) setLeftX: (float) leftX;
    _leftX = leftX;

As you can see, properties can save us lots of monotonous typing. You do need to match up property names to instance variables, but that's a small price to pay. And as a bonus, if you name your instances variables the same as your properties, you don't need the "=" part of the @synthesize lines. I still prefer underscore prefixes for my instance variables, but that's just personal taste.

You'll notice that we still implement the area and perimeter methods. This is completely legal, and it shows how you can mix property declarations and custom method implementations, if you need to do so. We need to do it because these methods are calculations and have no corresponding instance variables.

Since properties are Leopard-only, this code will not compile in previous versions of Xcode. If you want to run this on earlier versions of Xcode and Mac OS X, you'll need to replace all the @property lines with their corresponding accessor methods.

We're now going to create a GUI around this Rectangle class to allow the user to perform area and perimeter calculations. First, set up our user interface in Interface Builder. Drag labels, text fields, and a button into the window, and resize the window so it looks like Figure 19.

Figure 19: Rectangle window layout

When you're dragging things around and setting up the GUI, you will probably see dashed blue lines pop up, as shown in Figure 20. These are guides that give you hints about Apple's Human Interface Guidelines (HIG). The HIG is a document that specifies many guidelines about designing consistent user interfaces for Mac OS X. It's a big document, and a good read if you plan on doing any serious Cocoa development. Part of the information included in the HIG is spacing guidelines of components, such as how many pixels should be used as border for windows. Luckily, Interface Builder shows us these blue HIG guides so that we don't have to count pixels to make sure we're laying things out correctly.

Figure 20: Rectangle window with HIG guides

With our user interface in place, we need to go back into Xcode to hook up these components. Modify the HelloWorldController.h header file to match Listing 9.

Listing 9: HelloWorldController.h for rectangles

#import <Cocoa/Cocoa.h>
@class Rectangle;
@interface HelloWorldController : NSObject
    IBOutlet NSTextField * _widthField;
    IBOutlet NSTextField * _heightField;
    IBOutlet NSTextField * _areaLabel;
    IBOutlet NSTextField * _perimiterLabel;
    Rectangle * _rectangle;
- (IBAction) calculate: (id) sender;

With these outlets and actions in place, save this file, go back to Interface Builder, and make the appropriate connections. If you did it properly, the connections for Hello World Controller should look like Figure 21.

Figure 21: Connections for Hello World Controller

Now, we can finish implementing our controller class. Modify the HelloWorldController.m source file to match Listing 10.

Listing 10: HelloWorldController.m for rectangles

#import "HelloWorldController.h"
#import "Rectangle.h"
@implementation HelloWorldController
- (id) init
    self = [super init];
    if (self == nil)
        return nil;
    _rectangle = [[Rectangle alloc]   initWithLeftX: 0
                                         bottomY: 0
                                          rightX: 5
                                            topY: 10];
    return self;
- (void) updateAreaAndPerimeter
    [_areaLabel setFloatValue: _rectangle.area];
    [_perimiterLabel setFloatValue: _rectangle.perimeter];
- (IBAction) calculate: (id) sender
    _rectangle.width = [_widthField floatValue];
    _rectangle.height = [_heightField floatValue];
    [self updateAreaAndPerimeter];
- (void) awakeFromNib
    [_widthField setFloatValue: _rectangle.width];
    [_heightField setFloatValue: _rectangle.height];
    [self updateAreaAndPerimeter];

We've had to beef this up a bit, but it's still pretty simple. In our constructor, we create a new Rectangle instance with a width of 5 and a height of 10. Our calculate: action sets the rectangle's width and height from the text fields, using the floatValue method. It then calls updateAreaAndPerimiter to set the area and perimeter labels according to the rectangle's current area and perimeter. This code also demonstrates another benefit of properties: you can use the dot notation to access them. Thus, instead of calling setter methods:

- (IBAction) calculate: (id) sender
    [_rectangle setWidth: [_widthField floatValue]];
    [_rectangle setHeight: [_heightField floatValue]];
    [self updateAreaAndPerimeter];

we can use the dot notation, _rectangle.width =, as shown in Listing 10.

The only other new bit is the awakeFromNib method. This is called automatically by Cocoa at application startup. We use this to set up the initial values of the text fields and labels when our application is started. You'd think we could do this in our constructor, but there's a bit of a problem with that.

Figure 22: Initial Hello World window

Remember that objects inside a nib file are "freeze-dried" or "put to sleep" when Interface Builder saves the nib file. When you application runs, these saved objects are "reconstituted" or "awoken" at application launch time. The problem is that we don't know what order these objects are awoken and created. Thus, the text fields and labels may not be initialized when our constructor is called. To get around this situation, Cocoa first instantiates all sleeping objects in the nib, and then calls awakeFromNib on each of these objects. You don't have to implement awakeFromNib, but we take this opportunity to setup the initial GUI state. As a rule, if you need to work with outlets, you must not do so in the constructor. Use the awakeFomNib method. Thus, when our application is first run, you will see a window that looks like Figure 22 (above).

We can now change the width and height and click the Calculate button. If everything went as planned, the area and perimeter will be updated as shown in Figure 23.

Figure 23: Calculated area and perimeter


Well, how about that! You've created your first honest-to-goodness Mac OS X GUI application. As you can see, it often does not take that much code to produce nice looking user interfaces. Interface Builder is the key to this ease. Now that you've got the basics of Interface Builder and GUI Mac OS X applications down, we can move on to bigger and better topics. The full source to the project will be available for download from the MacTech website.

Dave Dribin has been writing professional software for over eleven years. After five years programming embedded C in the telecom industry and a brief stint riding the Internet bubble, he decided to venture out on his own. Since 2001, he has been providing independent consulting services, and in 2006, he founded Bit Maki, Inc. Find out more at and


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Purchase a new Mac or iPad at The Apple Store for Education and take up to $300 off MSRP. All teachers, students, and staff of any educational institution qualify for the discount. Shipping is free,... Read more
Save up to $600 with Apple refurbished Mac Pr...
The Apple Store has Apple Certified Refurbished Mac Pros available for up to $600 off the cost of new models. An Apple one-year warranty is included with each Mac Pro, and shipping is free. The... Read more
Mac Pros on sale for up to $260 off MSRP
B&H Photo has Mac Pros on sale for up to $260 off MSRP. Shipping is free, and B&H charges sales tax in NY only: - 3.7GHz 4-core Mac Pro: $2799, $200 off MSRP - 3.5GHz 6-core Mac Pro: $3719.99... Read more

Jobs Board

*Apple* Retail - Multiple Positions (US) - A...
Job Description: Sales. Specialist - Retail Customer Service and Sales. Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
*Apple* Online Store UAT Lead - Apple (Unite...
**Job Summary** The Apple Online Store is a fast paced and ever evolving business environment. The User Acceptance Testing (UAT) lead in this organization is able to Read more
*Apple* MAC Support Services Subject Matter...
Title: Apple MAC Support Services Subject Matter Expert Location: Pleasanton, CA Type of position: Temporary Contract for approximately 6 weeks Tasks The tasks for the Read more
Lead Infrastructure Engineer - *Apple* /Mac P...
…of a team * Requires proven problem solving skills Preferred Additional: * Apple Certified System Administrator (ACSA) * Apple Certified Technical Coordinator (ACTC) Read more
*Apple* Retail - Multiple Positions (US) - A...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
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