day02-04-扑克牌

Objective-c

//  main.m
//  day02-04-扑克牌
//
//  Created by Aaron on 15/7/2.
//  Copyright (c) 2015年 Aaron. All rights reserved.
//
//左手和右手的扑克牌进行交换
#import <Foundation/Foundation.h>
#import "Pocker.h"
#import "Person.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Pocker *p1 = [[Pocker alloc] initWithName:@"♥10"];
        //%@ 输出字符串对象
        //NSLog(@"---%@",[p1 name]);
        Person *person = [[Person alloc] init];
        [person leftHandCatchPocker:p1];
        //[person showPocker];
        Pocker *p2 = [[Pocker alloc] initWithName:@"😎"];
        [person rightHandCatchPocker:p2];
        [person showPocker];
        [person changePocker];
        [person showPocker];
    }
    return 0;
}

#import <Foundation/Foundation.h>
#import "Hand.h"
@interface Person : NSObject
{
    Hand *_leftHand;
    Hand *_rightHand;
}
-(void)leftHandCatchPocker:(Pocker *)p;
-(void)rightHandCatchPocker:(Pocker *)p;
-(void)changePocker;
-(void)showPocker;
@end

#import "Person.h"
@implementation Person
-(instancetype)init
{
    //可以不初始化么，这里初始化成了什么值
    if(self = [super init])
    {
        _leftHand = [[Hand alloc] init];
        _rightHand = [[Hand alloc] init];
    }
    return self;
}
-(void)leftHandCatchPocker:(Pocker *)p
{
    //可以调用其他类的对象方法？
    [_leftHand setMyPocker:p];//变量可以调用方法？
}
-(void)rightHandCatchPocker:(Pocker *)p
{
    [_rightHand setMyPocker:p];
}
-(void)changePocker
{
    Pocker *temp = [_leftHand myPocker];
    [_leftHand setMyPocker:[_rightHand myPocker]];
    [_rightHand setMyPocker:temp];
}
-(void)showPocker
{
    NSLog(@"左手上的牌是:%@",
          [[_leftHand myPocker] name]);
    NSLog(@"右手上的牌是:%@",
          [[_rightHand myPocker] name]);
}
@end

#import <Foundation/Foundation.h>
//记得包含“Pocker.h”头文件
#import "Pocker.h"
@interface Hand : NSObject
{
    Pocker *_myPocker;// 带*号
}
-(void)setMyPocker:(Pocker *)p;
-(Pocker *)myPocker;
@end

#import "Hand.h"
@implementation Hand
-(void)setMyPocker:(Pocker *)p
{
    //为什么要判断
    if(_myPocker != p)
    {
        _myPocker = p;
    }
}
-(Pocker *)myPocker
{
    return _myPocker;
}
@end

#import <Foundation/Foundation.h>
@interface Pocker : NSObject
{
    NSString *_name;//申明字符串一定要带*号？
}
-(instancetype)initWithName:(NSString *)name;
-(NSString *)name;
@end

#import "Pocker.h"
@implementation Pocker
-(instancetype)initWithName:(NSString *)name
{
    //如果不初始化是什么后果
    if(self = [super init])
    {
        _name = name;
    }
    return self;
}
-(NSString *)name
{
    return _name;
}
@end