Cheat Sheet
iOS 6 Application Development For Dummies
The UIKit framework provides a lot of your iOS application’s basic functionality. As you develop your iOS app, you customize the UIKit framework by using subclassing, Target-Action, and delegation, but one challenge facing new developers is determining which of these mechanisms to use. This cheat sheet can help you decide.
When to Use Subclassing in iOS 6 App Development
Subclassing allows you to customize behaviors while you're developing your iOS application. Keep the following points about subclassing in mind as you develop your app:
In the first stage, you create a new class, called a subclass, that inherits properties from another (super) class
In the second stage, you add properties as needed for your iOS application.
In general, you'll want to subclass the following
UIView, to create your (more complex) content views, which you may fill with controls, graphics, and so on.
UIViewController, to manage the content views and connect them to the model.
NSObject, to create Model views and delegates.
Knowing the Target-Action Patterns for iOS 6 App Development
Following are the Target-Action patterns that you use when programming iOS applications. Specify the target as the view controller (which you'll have already subclassed).
UITabBarItem (for items on the tab bar)
UIBarButtonItem (for items on the Navigation bar and toolbar)
UIButton
UIDatePicker
UIPageControl
UISegmentedControl
UITextField
UISlider
UISwitch
Building iOS 6 Apps Using Delegates with Views and Other Classes
The following table includes delegates used in iOS application development. Exceptions to when you need to use a delegate are shown in the Special Use column.
| Class | Delegate(s) Protocol | Special Use |
|---|---|---|
| ABPeoplePickerNavigation Controller ABNewPersonView Controller ABNewPersonView Controller ABUnknownPersonView Controller |
ABPeoplePickerNavigationControllerDelegate ABNewPersonViewControllerDelegate ABNewPersonViewControllerDelegate ABUnknownPersonViewControllerDelegate |
|
| AVAudioRecorder | AVAudioRecorderDelegate | |
| AVAudioSession | AVAudioSessionDelegate | |
| CAAnimation | None | |
| CAAnimationGroup | None | |
| CALayer | None | |
| CLLocationManager | CLLocationManagerDelegate | |
| EAAccessory | EAAccessoryDelegate | |
| GKGameCenterView Controller |
GKGameCenterControllerDelegate | The delegate is called when the player dismisses the Game Center user interface. New to iOS 6. |
| GKSession | GKSessionDelegate | |
| GKPeerPickerController | GKPeerPickerControllerDelegate | |
| NSError | NSErrorRecoveryAttempting | |
| MKMapView | MKAnnotation | |
| MKMapViewDelegate | ||
| MkReverseGeocoder | MKReverseGeocoderDelegate | |
| NSNetService NSNetServiceBrowser |
NSNetServiceDelegate NSNetServiceBrowserDelegate |
|
| NSStream | NSStreamDelegate | |
| NSPort NSMachPort |
NSPortDelegate NSMachPortDelegate |
|
| NSFetchedResultsController | NSFetchedResultsControllerDelegate | |
| NSKeyedArchiver NSKeyedUnarchiver | NSKeyedArchiverDelegate
NSKeyedUnarchiverDelegate |
|
| NSURLConnection | None | |
| MFMailComposeViewController | MFMailComposeViewControllerDelegate | |
| SKRequest SKProductsRequest |
SKRequestDelegate SKProductsRequestDelegate |
|
| UIAccelerometer | UIAccelerometerDelegate | |
| UIActionSheet | UIActionSheetDelegate | |
| UIAlertView | UIAlertViewDelegate | |
| UIApplication | UIApplicationDelegate | Also used for push notifications |
| UIImagePicker | UIImagePickerControllerDelegate | |
| UICollectionView | ||
| UINavigationBar | UINavigationBarDelegate | To push or pop view controllers |
| UIPickerView | UIPickerViewDataSource | |
| UIPickerViewDelegate | ||
| UIResponder | UIResponderStandardEditActions | Support for Copy, Paste, and Select |
| UIScrollView | UIScrollViewDelegate | Under some circumstances |
| UIScrollViewAccessibilityDelegate | Methods you can implement to provide accessibility information for a Scroll view. New to iOS 6. | |
| UISearchDisplayController | UISearchDisplayDelegate | |
| UISearchBar | UISearchBarDelegate | |
| UITabBar | UITabBarControllerDelegate | To customize a tab bar |
| UITableView | UITableViewDataSource | |
| UITableViewDelegate | ||
| 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 in iOS 6 App Development
Objective-C has many helpful operators for your iOS programming. Use the following table to jog your memory about which operator you should use to accomplish a certain task.
| Operator | What It Does |
|---|---|
| + | Addition |
| - | Subtraction |
| * | Multiplication |
| / | Division |
| % | Modulo |
| Operator | What It Does |
|---|---|
| == | Equal to |
| != | Not equal to |
| > | Greater than |
| < | Less than |
| >= | Greater than or equal to |
| <= | Less than or equal to |
| Operator | What It Does |
|---|---|
| ! | NOT |
| && | Logical AND |
| || | Logical OR |
| Operator | What It Does |
|---|---|
| += | Addition |
| -= | Subtraction |
| *= | Multiplication |
| \/= | Division |
| \%= | Modulo |
| &= | Bitwise AND |
| |= | Bitwise Inclusive OR |
| ^= | Exclusive OR |
| <<= | Shift Left |
| >>= | Shift Right |
| Operator | What It Does |
|---|---|
| ++ | Addition |
| -- | Subtraction |
| *= | Multiplication |
| /= | Division |
| %= | Modulo |
| &= | Bitwise AND |
| |= | Bitwise Inclusive OR |
| ^= | Exclusive OR |
| <<= | Shift Left |
| >>= | Shift Right |
| Operator | What It Does |
|---|---|
| & | Bitwise AND |
| | | Bitwise Inclusive OR |
| ^ | Exclusive OR |
| ~ | Unary complement (bit inversion) |
| << | Shift Left |
| >> | Shift Right |
| Operator | What It Does |
|---|---|
| () | Cast |
| , | Comma |
| Sizeof() | Size of |
| ? : | Conditional |
| & | Address |
| * | Indirection |
