Objective-C 面向对象基础-构造方法

//
//  Goods.h
//  04_Description
//
//  Created by apple on 14-11-9.
//  Copyright (c) 2014年 cc. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Goods : NSObject {

int _price;
int _count;

}

/**
*  多参的构造方法
*
*  @param price 价格
*  @param count 数量
*
*  @return 当前类的对象
*/
- (id)initWithAttribute:(int)price:(int)count;

- (void)setPrice:(int)price;
- (int)price;

- (void)setCount:(int)count;
- (int)count;

@end

//
//  Goods.m
//  04_Description
//
//  Created by apple on 14-11-9.
//  Copyright (c) 2014年 cc. All rights reserved.
//

#import "Goods.h"

@implementation Goods

/**
*  多参的构造方法
*
*  @param price 价格
*  @param count 数量
*
*  @return 当前类的对象
*/
-(id)initWithAttribute:(int)price :(int)count {
//需要调用父类（super）的构造来初始化当前类的对象
self = [super init];
if (self) {
//给成员属性赋值
_price = price;
_count = count;
}

// id类型可以代表任意类型的对象，这里是返回当前类的对象
return self;
}

-(void)setPrice:(int)price {
_price = price;
}

-(int)price {
return _price;
}

-(void)setCount:(int)count {
_count = count;
}

-(int)count {
return _count;
}

@end

//
//  main.m
//  04_Description
//
//  Created by apple on 14-11-9.
//  Copyright (c) 2014年 cc. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Goods.h"

int main(int argc, const char * argv[]) {

@autoreleasepool {

//通过构造给成员属性赋值赋值
Goods* pGoods = [[Goods alloc] initWithAttribute:10 :20];

NSLog(@"价格=%d, 数量=%d", pGoods.price, pGoods.count);

}
return 0;
}