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iPhone SDK Programming: A Beginner s Guide
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Modifying buttons Understanding the UIToolbar Understanding the UISlider and UISwitch Understanding UITextField and UITextArea Understanding using a UIWebView
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n this chapter you learn how to use several of the iPhone SDK s available controls You also learn about the toolbar and the web browser view Although this chapter is not comprehensive, it will help you get started understanding the many controls you might use when creating an iPhone application Several of the screenshots come directly from Apple s UICatalog example application (Figure 12-1) You can download this application at Apple s Web site But note, the controls it illustrates are created programmatically, and not using Interface Builder
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Figure 12-1 Apple s UICatalog sample application
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Figure 12-2 Apple s UICatalog s buttons screen
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Buttons
The most rudimentary control is arguably the button What can you say about buttons You click them, or on an iPhone, you tap them, and something happens The iPhone has several different button styles (Figure 12-02) Implementing a button is not hard In the next few sections you examine the buttons available when programming an iPhone
UIButton with a Background Image and Image
Although Apple s stock button, the rounded rectangular button, sometimes looks nice (Figure 12-3) it is usually rather ugly You are not limited to plain buttons though, and can make your buttons appear nicer For instance, you can add a background image or an image Creating custom buttons by adding an image or background image is not hard, but the artistic effort making the images appear correctly is time consuming However, the results are usually worth the extra effort
iPhone SDK Programming: A Beginner s Guide
Figure 12-3 The YouTube App uses plain buttons
Try This
Using a Custom Button Background Image and Image
1 Create a new View-based Application Name it ButtonsBackground 2 Add outlets for two UIButtons to ButtonsBackgroundViewController (Listings 12-1 and 12-2) 3 Add an action called disableBut and add the code in Listing 12-2 to the method 4 Add the butbackgraypng, butbackbluegraypng, butbackgraydisabledpng, powerpng, and
powerdisablepng to the Resources folder in Groups & Files You will find these images in this book s resources folder
5 Save and build 6 Open ButtonsBackgroundViewControllerxib in Interface builder 7 Drag three buttons vertically aligned onto the view s canvas Connect the second button to
one of the outlets and connect the third button to one of the outlets
8 Connect the disableBut action to the top button s Touch Up Inside 9 Add the text Disable to the top button
12:
Controls Part One
Figure 12-4 Ensure the Shows Touch on Highlight is checked
10 For the second button, open the inspector to Buttons Attributes Ensure the Shows Touch
on Highlight is checked (Figure 12-4)
11 Notice the drop-down (Figure 12-5) Here you select the button s state and the related
field s values will only apply to that state Ensure Default State Configuration is selected
12 Change Background to butbackgraypng and change Image to powerpng 13 Select Highlighted State Configuration and change Background to butbackbluegraypng
and Image to powerpng
(continued)
iPhone SDK Programming: A Beginner s Guide
Figure 12-5 Selecting a button s state
14 Select Disabled State Configuration and change Background to butbackgraydisabledpng
and Image to powerdisabledpng
15 For the third button, ensure Default State Configuration is selected and add the text
Shock to Title Select the butbackgraypng for Background
16 Select Highlighted State Configuration and add the text Shocking to Title Select
butbackbluegraypng as the Background Note: do not make any changes to the Disable setting
17 Resize the buttons as necessary so they appear nice 18 Click Build And Go to run the application
12:
Controls Part One
Listing 12-1
ButtonsBackgroundViewControllerh
#import <UIKit/UIKith> @interface ButtonsBackgroundViewController : UIViewController { IBOutlet UIButton * clearButton; IBOutlet UIButton * smallButton; } @property (nonatomic, retain) IBOutlet UIButton * clearButton; @property (nonatomic, retain) IBOutlet UIButton * smallButton; - (IBAction) disableBut: (id) sender; @end
Listing 12-2
ButtonsBackgroundViewControllerm
#import "ButtonsBackgroundViewControllerh" @implementation ButtonsBackgroundViewController @synthesize clearButton; @synthesize smallButton; - (IBAction) disableBut: (id) sender { if(clearButtonenabled == YES) { clearButtonenabled = NO; smallButtonenabled = NO; [((UIButton *) sender) setTitle:@"Enable" forState: UIControlStateNormal]; } else { clearButtonenabled = YES; smallButtonenabled = YES; [((UIButton *) sender) setTitle:@"Disable" forState: UIControlStateNormal]; } } - (void)dealloc { [clearButton release]; [smallButton release]; [super dealloc]; } @end
Notice the results upon tapping the buttons The buttons change the background image from grey to bluish-gray (Figure 12-6) The bottom button also changes its title Click Disable, and the buttons are grayed out (Figure 12-7) The button with the image changes its background image and image to the choices made above The button with the title text has this functionality built in Making the button appear disabled was done automatically for you without you specifying images for the disabled state
(continued)
iPhone SDK Programming: A Beginner s Guide
Figure 12-6 The buttons background image changes
Figure 12-7 The buttons are grayed-out when disabled
12: TIP
Controls Part One
Another way to create a custom button is by setting a button s type to custom That technique is not shown here It is not hard though First, add an image to a button Second, change the button s type to custom and only the image is visible Note that you can use different images for different button states, exactly as you did in the previous example application
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