Objective-C的面向对象－－－类定义

1. 类对象的定义：

1.1 @interface：用于定义公共类的接口。

    表示类的实现和方法声明可以开始了。传递给编译器有关类的信息；预示这是新申明的接口。

1.2 新的接口的申明

如： - (void) setFillColor: (ShapeColor) fillColor;

//

//  Circle.h

//  Circle

//

//  Created by macsir on 12-10-25.

//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.

//

#import <Foundation/Foundation.h>

typedef enum {

    kRedColor,

    kGreenColor,

    kBlueColor

} ShapeColor;

typedef struct {

    int x, y, width, height;

}ShapeRect;

@interface Circle : NSObject

{

    ShapeColor fillColor;

    ShapeRect bounds;

}

- (void) setFillColor: (ShapeColor) fillColor;

- (void) setBounds: (ShapeRect) bounds;

- (void) draw;

- (NSString*) colorName: (ShapeColor) colorName;

@end //Circle

2. 接口的实现

2.1 @implementation：接口的具体实现

//

//  Circle.m

//  Circle

//

//  Created by macsir on 12-10-25.

//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.

//

#import "Circle.h"

@implementation Circle //用于定义类的公共接口

- (void) setFillColor: (ShapeColor) c

{

    fillColor = c;

} //setFillColor

- (void) setBounds: (ShapeRect) b

{

    bounds = b;

} //setBounds

- (void) draw

{

    NSLog(@"Drawing a circle at (%d %d %d %d) in %@", bounds.x , bounds.y, bounds.width, bounds.height, colorName(fillColor));

}

- (NSString *) colorName: (ShapeColor)colorName

{

    switch (colorName) {

        case kRedColor:

            return @"Red";

            break;

        case kGreenColor:

            return @"Green";

            break;

        case kBlueColor:

            return @"Blue";

            break;

        default:

            break;

            

    }

    return @"no clue";

} //colorName

@end