iOS设计模式解析（一）工厂方法

  • 工厂方法：定义创建对象的借口，让子类决定实例化哪一个类。工厂方法是一个类的实例化延迟到了子类
  • 例如      ：Shoes厂有两个子类（Newbalance、Nike）构建类图如下：　　

　　

  • 代码实现： 
     1 #import "shoes.h"
 2 
 3 @implementation shoes
 4 
 5 -(instancetype)initWithFrame:(CGRect)frame{
 6     if (self == [super initWithFrame:frame]) {
 7         //牌子
 8         _band = @"Shoes";
 9     }
10     return self;
11 }
12 
13 @end
    Shoes
     1 #import "NewBlance.h"
 2 
 3 @implementation NewBlance
 4 -(instancetype)initWithFrame:(CGRect)frame{
 5     if (self == [super initWithFrame:frame]) {
 6         self.band = @"NewBlance";
 7     }
 8     return self;
 9 }
10 
11 @end
    NewBlance
     1 #import "Nike.h"
 2 
 3 @implementation Nike
 4 -(instancetype)initWithFrame:(CGRect)frame{
 5     if (self == [super initWithFrame:frame]) {
 6         self.band = @"Nike";
 7     }
 8     return self;
 9 }
10 
11 @end
    Nike
     1 #import "ViewController.h"
 2 #import "NewBlance.h"
 3 #import "Nike.h"
 4 @interface ViewController ()
 5 
 6 @end
 7 
 8 @implementation ViewController
 9 
10 - (void)viewDidLoad {
11     [super viewDidLoad];
12     
13     NewBlance * shoeNB   = [[NewBlance alloc]initWithFrame:CGRectZero];
14     NSLog(@"%@",shoeNB.band);
15 
16     Nike      * shoeNike = [[Nike alloc]initWithFrame:CGRectZero];
17     NSLog(@"%@",shoeNike.band);
18 }
19 
20 - (void)didReceiveMemoryWarning {
21     [super didReceiveMemoryWarning];
22 }
23 
24 @end
    ViewController

     

  • 打印结果：

    2016-05-09 15:49:45.109 Factory[2416:181448] NewBlance

    2016-05-09 15:49:45.110 Factory[2416:181448] Nike

posted @ 2016-05-09 15:52  conor  阅读(183)  评论(0)  编辑  收藏  举报