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The document discusses the Model-View-Controller (MVC) pattern and its implementation in an iOS app called LightTheCandle. It describes creating a Candle class to represent the model, with properties for the candle's state and images. It then explains storing the candle object's properties in an NSDictionary instead of using the class directly, to toggle the candle's images and update the UI from the dictionary values.

1 of 20
(2) Bit Academy
• MVC • • • • NSDictionary
MVC • Model View Controller : , , . • Model : • View : • Controller :
MVC LightTheCandle • LightTheCandleAppDelegate • MVC Candle class Controller
NSDictionary
Candle
Candle • LightTheCandleAppDelegate candleState, candleOffImage, candleOnImage Candle . • LightTheCandleAppDelegate Candle .
• candle candleState . • candleState getter • candleState setter set + CandleState = setCandleState.
Candle.h #import <Foundation/Foundation.h> @interface Candle : NSObject { ! BOOL candleState; ! UIImage *candleOnImage; ! UIImage *candleOffImage; } - (BOOL)candleState; - (void)setCandleState:(BOOL)newState; - (UIImage *)candleOnImage; - (void)setCandleOnImage:(UIImage *)newImage; - (UIImage *)candleOffImage; - (void)setCandleOffImage:(UIImage *)newImage; /* @property (assign) BOOL candleState; @property (retain) UIImage *candleOnImage; @property (retain) UIImage *candleOffImage; */ @end
• LightTheCandleAppDelegate applicationDidFinishLaunching: Candle . • -(id)init . NSObject
Candle.m init init ! self super init ; ! self ! ! candleState ; ! ! candleOnPath mainBundle pathForResource ofType ; ! ! candleOffPath mainBundle pathForResource ofType ; ! ! candleOffImage UIImage alloc initWithContentsOfFile candleOffPath ; ! ! candleOnImage UIImage alloc initWithContentsOfFile candleOnPath ; !   ! self;
Candle candleState ! candleState; Candle.m setCandleState newState ! candleState newState;   UIImage candleOffImage ! candleOffImage; setCandleOffImage UIImage newImage ! UIImage oldImage candleOffImage; ! oldImage newImage ! ! candleOffImage newImage retain ; ! ! oldImage oldImage release ; !   UIImage candleOnImage ! candleOnImage; setCandleOnImage UIImage newImage ! UIImage oldImage candleOnImage; ! oldImage newImage ! ! candleOnImage newImage retain ; ! ! oldImage oldImage release ; !
LightTheCandleAppDelegate • Candle • Candle *myCandle .h • myCandle = [[Candle alloc] init] .m • @class Candle .m #import “Candle.hâ€
applicationDidFinishLaunching applicationDidFinishLaunching UIApplication application   ! myCandle Candle alloc init ; !   ! candleImageView setImage myCandle candleOffImage ; onOffSwitch.on = [myCandle candleState]; candleStateLabel.text = @â€Candle is Off. Please light onâ€; window makeKeyAndVisible ;
togggleCandle IBAction toggleCandle sender ! myCandle setCandleState myCandle candleState ; ! myCandle candleState ! ! ! ! candleImageView setImage myCandle candleOnImage ; ! ! onOffSwitch.on ; ! ! candleStateLabel.text ; ! ! ! ! ! candleImageView setImage myCandle candleOffImage ; ! ! onOffSwitch.on ; ! ! candleStateLabel.text ; !
• . • • Property synthesize
property Candle Candle Candle ! candleState; ! candleState; ! UIImage candleOffImage; ! UIImage candleOffImage; ! UIImage candleOnImage; ! UIImage candleOnImage;     candleState; assign candleState; setCandleState newState; retain UIImage candleOffImage;   retain UIImage candleOnImage; UIImage candleOffImage;   setCandleOffImage UIImage newImage;     UIImage candleOnImage; setCandleOnImage UIImage newImage;   Candle   candleState ! candleState; setCandleState newState ! candleState newState; UIImage candleOffImage ! candleOffImage; setCandleOffImage UIImage newImage Candle ! UIImage oldImage candleOffImage; ! oldImage newImage   ! ! candleOffImage newImage retain ; candleState; ! ! oldImage oldImage release ; candleOffImage; ! candleOnImage; UIImage candleOnImage ! candleOnImage; setCandleOnImage UIImage newImage ! UIImage oldImage candleOnImage; ! oldImage newImage ! ! candleOnImage newImage retain ; ! ! oldImage oldImage release ; !
NSDictionary • Candle *myCandle -> .h ï¬le NSMutableDictionary *myCandleDict • myCandle = [[Candle alloc] init] -> myCandleDict = [[NSMutableDictionary alloc] initWithCapacity:10] appDelegate.m ï¬le
-applicationDidFinishLaunching candleState = NO; NSString *candleOnPath = [[NSBundle mainBundle] pathForResource: @â€candle on†ofType: @â€jpgâ€]; NSString *candleOffPath = [[NSBundle mainBundle] pathForResource: @â€candle off†ofType: @â€jpgâ€]; candleOffImage = [[UIImage alloc] initWithContentsOfFile:candleOffPath]; candleOnImage = [[UIImage alloc] initWithContentsOfFile:candleOnPath]; [myCandleDict setValue: [NSNumber numberWithBool: candleState] forKey:@â€candleStateâ€]; [myCandleDict setValue: candleOffImage forKey:@â€candleOffImageâ€]; [myCandleDict setValue:candleOnImage forKey:@â€candleOnImageâ€]; Integer, Float, Bool NSNumber
toggleCandle -(IBAction)toggleCandle:(id)sender { BOOL candleState = [[myCandleDict valueForKey: @â€candleStateâ€] boolValue]; [myCandleDict setValue:[NSNumber numberWithBool:!candleState] forKey:@â€candleStateâ€]; if(!candleState) { //On [candleImageView setImage:[myCandleDict valueForKey:@â€candleImageâ€]]; onOffSwitch.on = YES; candleStateLabel.text = @â€Candle is now onâ€; } else { //Off [candleImageView setImage: [myCandleDict valueForKey: @â€candleOffImageâ€]]; onOffSwitch.on = NO; candleStateLabel.text = @â€Candle is off. please light onâ€; } }

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  • 1. (2) Bit Academy
  • 2. • MVC • • • • NSDictionary
  • 3. MVC • Model View Controller : , , . • Model : • View : • Controller :
  • 4. MVC LightTheCandle • LightTheCandleAppDelegate • MVC Candle class Controller
  • 7. Candle • LightTheCandleAppDelegate candleState, candleOffImage, candleOnImage Candle . • LightTheCandleAppDelegate Candle .
  • 8. • candle candleState . • candleState getter • candleState setter set + CandleState = setCandleState.
  • 9. Candle.h #import <Foundation/Foundation.h> @interface Candle : NSObject { ! BOOL candleState; ! UIImage *candleOnImage; ! UIImage *candleOffImage; } - (BOOL)candleState; - (void)setCandleState:(BOOL)newState; - (UIImage *)candleOnImage; - (void)setCandleOnImage:(UIImage *)newImage; - (UIImage *)candleOffImage; - (void)setCandleOffImage:(UIImage *)newImage; /* @property (assign) BOOL candleState; @property (retain) UIImage *candleOnImage; @property (retain) UIImage *candleOffImage; */ @end
  • 10. • LightTheCandleAppDelegate applicationDidFinishLaunching: Candle . • -(id)init . NSObject
  • 11. Candle.m init init ! self super init ; ! self ! ! candleState ; ! ! candleOnPath mainBundle pathForResource ofType ; ! ! candleOffPath mainBundle pathForResource ofType ; ! ! candleOffImage UIImage alloc initWithContentsOfFile candleOffPath ; ! ! candleOnImage UIImage alloc initWithContentsOfFile candleOnPath ; !   ! self;
  • 12. Candle candleState ! candleState; Candle.m setCandleState newState ! candleState newState;   UIImage candleOffImage ! candleOffImage; setCandleOffImage UIImage newImage ! UIImage oldImage candleOffImage; ! oldImage newImage ! ! candleOffImage newImage retain ; ! ! oldImage oldImage release ; !   UIImage candleOnImage ! candleOnImage; setCandleOnImage UIImage newImage ! UIImage oldImage candleOnImage; ! oldImage newImage ! ! candleOnImage newImage retain ; ! ! oldImage oldImage release ; !
  • 13. LightTheCandleAppDelegate • Candle • Candle *myCandle .h • myCandle = [[Candle alloc] init] .m • @class Candle .m #import “Candle.hâ€
  • 14. applicationDidFinishLaunching applicationDidFinishLaunching UIApplication application   ! myCandle Candle alloc init ; !   ! candleImageView setImage myCandle candleOffImage ; onOffSwitch.on = [myCandle candleState]; candleStateLabel.text = @â€Candle is Off. Please light onâ€; window makeKeyAndVisible ;
  • 15. togggleCandle IBAction toggleCandle sender ! myCandle setCandleState myCandle candleState ; ! myCandle candleState ! ! ! ! candleImageView setImage myCandle candleOnImage ; ! ! onOffSwitch.on ; ! ! candleStateLabel.text ; ! ! ! ! ! candleImageView setImage myCandle candleOffImage ; ! ! onOffSwitch.on ; ! ! candleStateLabel.text ; !
  • 16. • . • • Property synthesize
  • 17. property Candle Candle Candle ! candleState; ! candleState; ! UIImage candleOffImage; ! UIImage candleOffImage; ! UIImage candleOnImage; ! UIImage candleOnImage;     candleState; assign candleState; setCandleState newState; retain UIImage candleOffImage;   retain UIImage candleOnImage; UIImage candleOffImage;   setCandleOffImage UIImage newImage;     UIImage candleOnImage; setCandleOnImage UIImage newImage;   Candle   candleState ! candleState; setCandleState newState ! candleState newState; UIImage candleOffImage ! candleOffImage; setCandleOffImage UIImage newImage Candle ! UIImage oldImage candleOffImage; ! oldImage newImage   ! ! candleOffImage newImage retain ; candleState; ! ! oldImage oldImage release ; candleOffImage; ! candleOnImage; UIImage candleOnImage ! candleOnImage; setCandleOnImage UIImage newImage ! UIImage oldImage candleOnImage; ! oldImage newImage ! ! candleOnImage newImage retain ; ! ! oldImage oldImage release ; !
  • 18. NSDictionary • Candle *myCandle -> .h ï¬le NSMutableDictionary *myCandleDict • myCandle = [[Candle alloc] init] -> myCandleDict = [[NSMutableDictionary alloc] initWithCapacity:10] appDelegate.m ï¬le
  • 19. -applicationDidFinishLaunching candleState = NO; NSString *candleOnPath = [[NSBundle mainBundle] pathForResource: @â€candle on†ofType: @â€jpgâ€]; NSString *candleOffPath = [[NSBundle mainBundle] pathForResource: @â€candle off†ofType: @â€jpgâ€]; candleOffImage = [[UIImage alloc] initWithContentsOfFile:candleOffPath]; candleOnImage = [[UIImage alloc] initWithContentsOfFile:candleOnPath]; [myCandleDict setValue: [NSNumber numberWithBool: candleState] forKey:@â€candleStateâ€]; [myCandleDict setValue: candleOffImage forKey:@â€candleOffImageâ€]; [myCandleDict setValue:candleOnImage forKey:@â€candleOnImageâ€]; Integer, Float, Bool NSNumber
  • 20. toggleCandle -(IBAction)toggleCandle:(id)sender { BOOL candleState = [[myCandleDict valueForKey: @â€candleStateâ€] boolValue]; [myCandleDict setValue:[NSNumber numberWithBool:!candleState] forKey:@â€candleStateâ€]; if(!candleState) { //On [candleImageView setImage:[myCandleDict valueForKey:@â€candleImageâ€]]; onOffSwitch.on = YES; candleStateLabel.text = @â€Candle is now onâ€; } else { //Off [candleImageView setImage: [myCandleDict valueForKey: @â€candleOffImageâ€]]; onOffSwitch.on = NO; candleStateLabel.text = @â€Candle is off. please light onâ€; } }