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Objective-C: クラスインターフェースの書き方

Last updated at Posted at 2012-06-30

内部で使うインスタンス変数はなるべく.m側に書くようにする。IBOutlet, IBAction も .h に書く必要は無い。

Hoge.h
@interface Hoge : NSObject

- (void)method;

@end
Hoge.m
#import "Hoge.h"


// @interface クラス名() @end の形で書く
@interface Hoge()
{
	IBOutlet UIView *view;
	IBOutlet UButton *button;
	
	id _object;
}

// メソッドのプロトタイプ宣言
- (IBAction)buttonAction:(id)sender;

- (void)_myMethod;

@end

#pragma mark -

@implementation

- (void)method {}

@end


同様に、公開する必要の無いプロパティも.m側に書ける。

Hoge.h
@interface Hoge : NSObject

// 公開用のプロパティ
@property (assign, nonatomic) NSInteger count;

- (void)method;

@end
Hoge.m
#import "Hoge.h"

@interface Hoge()
{
}

// クラス内で使うプロパティ
@property (retain, nonatomic) NSString *string;
@property (assign, nonatomic) BOOL flag;

@end

#pragma mark -

@implementation

@synthesize string;
@synthesize flag;


@synthesize count;

- (void)method {}

- (void)dealloc
{
	self.string = nil;
	
	[super dealloc];
}

@end


このように書けば.hの記述をすっきりさせることができる。

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