Cheat Sheet

iPhone Application Development All-in-One For Dummies

The UIKit framework provides a great deal of your iPhone application’s basic functionality. As you develop your iPhone app, you customize the behavior of the UIKit framework by using subclassing, target-action, and delegation, but one challenge facing new developers is determining which of these mechanisms to use when. These tips can help you decide:

When to Use Subclassing in iPhone App Development

Subclassing is one of the mechanisms you use to customize behaviors while you're developing your iPhone application. Subclassing involves two stages: (1) creating a new class, called a subclass, that inherits properties from another (super) class and then (2) adding properties as needed for your iPhone application. In general, you’ll want to subclass

  • UIView, to create your (more complex) content views, which you may fill with controls, graphics, or the like.

  • UIViewController, to manage the content views and connect it to the model.

  • NSObject, to create Model views and delegates.

Knowing the Target-Action Patterns for iPhone App Development

Following are the Target-Action patterns that you use when programming iPhone applications. You generally will specify the target as the view controller (which you’ll have already subclassed) because it controls the view in which these controls reside.

  • UITabBarItem (for items on the tab bar)

  • UIBarButtonItem (for items on the navigation bar and tool bar)

  • UIButton

  • UIDatePicker

  • UIPageControl

  • UISegmentedControl

  • UITextField

  • UISlider

  • UISwitch

Using Delegates with Views and Other Classes

When you create iPhone applications, you use delegates to implement application-specific behavior for “generic” views or classes. The table includes all known available delegates used in iPhone application development, though others may be possible. Exceptions to when you need to use a delegate are shown in the Special Use column.

Class Delegate(s) Protocol Special Use
AVAudioRecorder AVAudioRecorderDelegate
AVAudioSession AVAudioSessionDelegate
CAAnimation None
CAAnimationGroup None
CALayer None
CLLocationManager CLLocationManagerDelegate
EAAccessory EAAccessoryDelegate
GKSession GKSessionDelegate
GKPeerPickerController GKPeerPickerControllerDelegate
NSError NSErrorRecoveryAttempting
MKMapView MKAnnotation
MkReverseGeocoder MKReverseGeocoderDelegate
NSStream NSStreamDelegate
NSFetchedResultsController NSFetchedResultsControllerDelegate
NSURLConnection None
MFMailComposeViewController MFMailComposeViewControllerDelegate
UIAccelerometer UIAccelerometerDelegate
UIActionSheet UIActionSheetDelegate
UIAlertView UIAlertViewDelegate
UIApplication UIApplicationDelegate Also used for push notifications
UIImagePicker UIImagePickerControllerDelegate
UINavigationBar UINavigationBarDelegate To push or pop view controllers
UIPickerView UIPickerViewDataSource
UIResponder UIResponderStandardEditActions Support for Copy, Paste, and Select
UIScrollView UIScrollViewDelegate Under some circumstances
UISearchDisplayController UISearchDisplayDelegate
UISearchBar UISearchBarDelegate
UITabBar UITabBarControllerDelegate To customize a tab bar
UITableView UITableViewDataSource
UITextField UITextFieldDelegate To put away the keyboard
UITextView UITextViewDelegate To examine text being edited
UISearchBar UISearchBarDelegate
UIWebView UIWebViewDelegate
MPMediaPickerController MPMediaPickerControllerDelegate
NSXMLParser NSXMLParserDelegate

Using Objective-C Operators

Objective-C operators, like those in other programming languages, let you perform operations on variables (hence the name). Objective-C provides many operators, and keeping track of all of them can be difficult as you program your iPhone app. Use the following tables to jog your memory as to which operator accomplishes what task.

Arithmetic Operators
Operator What It Does
+ Addition
- Subtraction
* Multiplication
/ Division
% Modulo
Relational and Equality Operators
Operator What It Does
== Equal to
!= Not equal to
> Greater than
< Less than
>= Greater than or equal to
<= Less than or equal to
Logical Operators
Operator What It Does
&& Logical AND
|| Logical OR
Compound Assignment Operators
Operator What It Does
+= Addition
-= Subtraction
*= Multiplication
\/= Division
\%= Modulo
&= Bitwise AND
|= Bitwise Inclusive OR
^= Exclusive OR
<<= Shift Left
>>= Shift Right
Increment and Decrement Operators
Operator What It Does
++ Addition
-- Subtraction
*= Multiplication
/= Division
%= Modulo
&= Bitwise AND
|= Bitwise Inclusive OR
^= Exclusive OR
<<= Shift Left
>>= Shift Right
Bitwise Operators
Operator What It Does
& Bitwise AND
| Bitwise Inclusive OR
^ Exclusive OR
~ Unary complement (bit inversion)
<< Shift Left
>> Shift Right
Other operators
Operator What It Does
() Cast
, Comma
Sizeof() Size of
? : Conditional
& Address
* Indirection
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