Objective-C 2.0の'@synthesize'の力 / getter, setterを書かない．

'NSProgressIndicatorのサンプルを作ってみた．'で'getter/setterについては…'と書いたところをObjective-C2.0方向で一応やってみた．

MyObject.h

#import <Cocoa/Cocoa.h>
@interface MyObject : NSObject {
 BOOL _animate;
 BOOL _indeterminate;
 float _progressValue;
 NSString *_buttonTitle;
 BOOL _buttonEnabled;
 NSString *_button2Title;
 BOOL _button2Enabled;
}
- (IBAction)start:(id)sender;
- (IBAction)start2:(id)sender;
@property (getter=animate,setter=setAnimate:)    BOOL  _animate;
@property (getter=indeterminate,setter=setIndeterminate:) BOOL  _indeterminate;
@property (getter=progressValue,setter=setProgressValue:) float  _progressValue;
@property (retain,setter=setButtonTitle:)     NSString *_buttonTitle;
@property (setter=setButtonEnabled:)      BOOL  _buttonEnabled;
@property (retain,setter=setButton2Title:)     NSString *_button2Title;
@property (getter=button2Enabled,setter=setButton2Enabled:) BOOL  _button2Enabled;
@end

MyObject.m

#import "MyObject.h"
@implementation MyObject
@synthesize _buttonTitle;
@synthesize _buttonEnabled;
@synthesize _button2Title;
@synthesize _button2Enabled;
@synthesize _animate;
@synthesize _indeterminate;
@synthesize _progressValue;
- (id)init{…}
- (IBAction)start2:(id)sender{…}
- (void)startJob{…}
@end

さてgetter,setter名を@propertyで宣言しないで@synthesizeを使用したらどういう命名規則となるか．基本的に変数名(ここでは'BOOL _animate'を参考)に基づき次のようになる

[self _animate];
[self set_animate:YES];

もしBOOL animate;なら以下らしい．

[self animate];
[self setAnimate:YES];

ということでコードは次のようになる．

MyObject.h

#import <Cocoa/Cocoa.h>
@interface MyObject : NSObject {
 BOOL _animate;
 BOOL _indeterminate;
 float _progressValue;
 NSString *_buttonTitle;
 BOOL _buttonEnabled;
 NSString *_button2Title;
 BOOL _button2Enabled;
}
- (IBAction)start:(id)sender;
- (IBAction)start2:(id)sender;
@property   BOOL  _animate;
@property   BOOL  _indeterminate;
@property   float  _progressValue;
@property (retain) NSString *_buttonTitle;
@property   BOOL  _buttonEnabled;
@property (retain) NSString *_button2Title;
@property   BOOL  _button2Enabled;
@end

MyObject.m

#import "MyObject.h"
@implementation MyObject
@synthesize _buttonTitle;
@synthesize _buttonEnabled;
@synthesize _button2Title;
@synthesize _button2Enabled;
@synthesize _animate;
@synthesize _indeterminate;
@synthesize _progressValue;
- (id)init
{
 if (self= [super init]) {
  _animate= NO;
  _indeterminate= YES;
  _buttonTitle= [NSString stringWithString:@"Start"];
  _buttonEnabled= YES;
  _button2Title= [NSString stringWithString:@"Start"];
  _button2Enabled= YES;
 }
 return self;
}
- (IBAction)start2:(id)sender
{
 [self set_indeterminate:NO];
 [NSThread detachNewThreadSelector:@selector(startJob)
        toTarget:self withObject:nil];
}
- (void)startJob
{
 NSAutoreleasePool* pool;
 pool = [[NSAutoreleasePool alloc]init];
 //------------------------------------
 {
  [self set_animate:YES];
  [self set_buttonEnabled:NO];
  [self set_button2Enabled:NO];
  [self set_progressValue:0.0];
 }
 int i, j, k;
 for(i= 0; i<100; i++) {
  for(j= 0; j<36000;) {
   for(k= 0; k<360;) {
    k++;
   }
   j++;
  }
  [self set_progressValue:i];
  [self set_button2Title:[NSString stringWithFormat:@"%d", i]];
 }
 {
  [self set_progressValue:100.0];
  [self set_button2Title:[NSString stringWithString:@"Start"]];
  [self set_button2Enabled:YES];
  [self set_buttonEnabled:YES];
  [self set_animate:NO];
 }
 //------------------------------------ 
 [pool release];
 [NSThread exit];
}
- (IBAction)start:(id)sender
{
 if ([self _animate]) {
  [self set_button2Enabled:YES];
  [self set_animate:NO];
  [self set_buttonTitle:[NSString stringWithString:@"Start"]];
 }
 else {
  [self set_button2Enabled:NO];
  [self set_indeterminate:YES];
  [self set_animate:YES];
  [self set_buttonTitle:[NSString stringWithString:@"Stop"]];
 }
}
@end

ただこれをやると当然Interface Builderでの定義もself.animateでなくself._animate等にしなくてはいけない．始めからそうすればいいのだが．
(サンプルだとButtonのBindingsでEnabled, Title, Proress IndicatorのBindingsでValue, Animate, Is IndetaminateのModel Key Path値の修正が必要）（注意：コメント参照のこと．（2008/10/28に 匿名さんにご指摘いただいてます．感謝））

もう一つ．こうなるとなにも[self _animate];なんて書かなくてもIBの定義と同じアクセスでよくなる．つまりMyObject.mは以下のように書ける．

MyObject.m

#import "MyObject.h"
@implementation MyObject
@synthesize _buttonTitle;
@synthesize _buttonEnabled;
@synthesize _button2Title;
@synthesize _button2Enabled;
@synthesize _animate;
@synthesize _indeterminate;
@synthesize _progressValue;
- (id)init
{
 if (self= [super init]) {
  self._animate= NO;
  self._indeterminate= YES;
  self._buttonTitle= [NSString stringWithString:@"Start"];
  self._buttonEnabled= YES;
  self._button2Title= [NSString stringWithString:@"Start"];
  self._button2Enabled= YES;
 }
 return self;
}
- (IBAction)start2:(id)sender
{
 self._indeterminate= NO;
 [NSThread detachNewThreadSelector:@selector(startJob)
        toTarget:self withObject:nil];
}
- (void)startJob
{
 NSAutoreleasePool* pool;
 pool = [[NSAutoreleasePool alloc]init];
 //------------------------------------
 {
  self._animate= YES;
  self._buttonEnabled= NO;
  self._button2Enabled= NO;
  self._progressValue= 0.0;
 }
 int i, j, k;
 for(i= 0; i<100; i++) {
  for(j= 0; j<36000;) {
   for(k= 0; k<360;) {
    k++;
   }
   j++;
  }
  self._progressValue= i;
  self._button2Title= [NSString stringWithFormat:@"%d", i];
 }
 {
  self._progressValue= 100.0;
  self._button2Title= [NSString stringWithString:@"Start"];
  self._button2Enabled= YES;
  self._buttonEnabled= YES;
  self._animate= NO;
 }
 //------------------------------------ 
 [pool release];
 [NSThread exit];
 

}
- (IBAction)start:(id)sender
{
 if (self._animate) {
  self._button2Enabled= YES;
  self._animate= NO;
  self._buttonTitle= [NSString stringWithString:@"Start"];
 }
 else {
  self._button2Enabled= NO;
  self._indeterminate= YES;
  self._animate= YES;
  self._buttonTitle= [NSString stringWithString:@"Stop"];
 }
}
@end

この辺りの書き方は2.0環境のみでよいか？とか，[]の方が明示的でよいとか．素直に好みなどなどで変わるな．

間違いありましたらご指摘いただければ幸いです．