iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode
iOS: XCode and Interface Builder
Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
Tommy MacWilliam
[email protected]
March 7, 2012
Today iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder
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Objective-C Review
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XCode
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Outlets and Actions
Outlets and Actions
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Delegates and Protocols
Delegates and Protocols
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Tic-Tac-Toe
Tic-Tac-Toe
Classes iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review
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@interface: .h files
XCode
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Interface Builder
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Outlets and Actions Delegates and Protocols Tic-Tac-Toe
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declare class methods and properties @class Something to use other classes
@implementation: .m files I I
define class methods and synthesize properties #import “Something.h” to use other classes
Classes iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
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-: instance methods, sent to objects (e.g. init)
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+: class methods, sent to class, not object (e.g. alloc)
Properties iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode
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Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
@property (nonatomic, assign) int foo;
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declare new property, specify how values are assigned
@synthesize foo = _foo; I
generate getters/setters for property
Message Passing iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder
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- (id)init
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- (id)initWithName:(NSString*)name - (id)initWithName:(NSString*)name age:(int)age
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[object initWithName:@”name”];
Outlets and Actions Delegates and Protocols Tic-Tac-Toe
GDB iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder
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create breakpoint by clicking on line number
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next: continue line-by-line
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step: go into a called function
Outlets and Actions
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continue: resume execution until next breakpoint
Delegates and Protocols
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print or mouse over variable to see value
Tic-Tac-Toe
Objective-C and GDB iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
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GDB
Interface Builder iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder
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File Inspector: nib options
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Quick Help: view documentation for the selected UIView
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Identity Inspector: modify object properties
Outlets and Actions
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Attributes Inspector: customize the selected UIView
Delegates and Protocols
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Size Inspector: change placement/size of UIView
Tic-Tac-Toe
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Connections Inspector: manage outlets/actions
Interface Builder iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review
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File’s Owner: object that loads nib
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First Responder: UIView currently in focus and responding to input
Outlets and Actions
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App Delegate: responsible for loading, resuming, etc.
Delegates and Protocols
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Window: container for UIView
XCode Interface Builder
Tic-Tac-Toe
Outlets iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
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IBOutlet tells XCode the object represents something in IB I I
NOT the type of the object, just a flag @property (nonatomic, strong) IBOutlet UIButton* button;
Using Outlets iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode
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define UIView properties in @interface
Interface Builder
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synthesize UIView properties in @implementation
Outlets and Actions
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connect Objects in Interface Builder
Delegates and Protocols Tic-Tac-Toe
Connecting Outlets iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review
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select placeholder where property is defined (File’s Owner or App Delegate)
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Ctrl-Click and drag to UIView
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select name of outlet
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???
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profit!
XCode Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
Actions iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
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IBAction tells XCode the method is used by something in IB I
equivalent to the void type, so all methods are void
Connecting Actions iOS: XCode and Interface Builder Tommy MacWilliam
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select UIView to fire callback for, open Connections Inspector
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Ctrl-Click callback, drag to placeholder where method is defined (File’s Owner or App Delegate)
Outlets and Actions
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select name of method
Delegates and Protocols
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???
Tic-Tac-Toe
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profit!
Objective-C Review XCode Interface Builder
Outlets and Actions iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
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TextFieldExample
Delegate iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode
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define object to handle actions
Interface Builder
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delegate object implements a protocol
Outlets and Actions Delegates and Protocols Tic-Tac-Toe
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guarantees definitions for methods exist
Protocol iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
@protocol SomeProtocol - (void)something - (int)calculateSomething:(int) @end
UITextFieldDelegate iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review
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textFieldShouldReturn: “done” button pressed
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textFieldShouldBeginEditing: user about to edit text
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textFieldShouldEndEditing: text field about to lose focus
XCode Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
Using Protocols and Delegates iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
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BetterTextFieldExample
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UtilityApp
Putting it All Together iOS: XCode and Interface Builder Tommy MacWilliam Objective-C Review XCode Interface Builder Outlets and Actions Delegates and Protocols Tic-Tac-Toe
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TicTacToe I I
our first of many award-winning apps follow along!
