Key-Value Coding, Key-Value observing(Chapter 7 of Cocoa Programming for Mac OS
1 #import <Foundation/Foundation.h>2
3
4 @interface AppController : NSObject
5 {
6 int fido;
7 }
8
9 - (int)fido;
10 - (void)setFido:(int)x;
11 - (IBAction)incrementFido:(id)sender;
12
13 @end
AppController.m
1 #import "AppController.h"
2
3 @implementation AppController
4
5 - (id)init
6 {
7 ;
8 forKey:@"fido"];
9 NSNumber *n = ;
10 NSLog(@"fido = %@", n);
11 return self;
12 }
13
14 - (int)fido
15 {
16 NSLog(@"-fido is returning %d", fido);
17 return fido;
18 }
19
20 - (void)setFido:(int)x
21 {
22 NSLog(@"-setFido: is called with %d", x);
23 fido = x;
24 }
25
26 - (IBAction)incrementFido:(id)sender
27 {
28 ;
29 fido++;
30 NSLog(@"fido is now %d", fido);
31 ;
32 }
33
34 @end
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