有关SharedInstance的问题 [英] Question regarding SharedInstance

问题描述

嘿伙计们，我想问，什么是shareInstance实际上？我的意思是什么用法？

目前我在两个不同文件之间进行通信时遇到了一些问题。

这是我的问题：
我有1个文件调用Ah / Am和另一个文件调用Bh / Bm
啊需要访问Bh中的一些数据，所以....有没有可能的方式我可以实现我想要的吗？
只是想知道它是SharedInstance能够解决我的问题吗？

寻找回复：）

解决方案

sharedInstance可以用于多种方式。

例如，您可以从静态上下文访问对象。实际上它用于支持Singleton模式的大多数方法。
这意味着只需要在整个程序代码中使用该类的一个对象，只需要一个实例。

接口可以如下所示：

  @interface ARViewController 
 {
} 
 @property（nonatomic，retain）NSString * ARName; 
 
 +（ARViewController *）sharedInstance; 
  

实施ARViewController：

  @implementation ARViewController 
 static id _instance 
 @synthesize ARName; 
 ... 
  - （id）init 
 {
 if（_instance == nil）
 {
 _instance = [[super allocWithZone：nil]在里面]; 
} 
 return _instance; 
} 
 
 +（ARViewController *）sharedInstance 
 {
 if（！_instance）
 {
 return [[ARViewController alloc] init] ; 
} 
 return _instance; 
} 
  

要访问它，请在CustomARFunction类中使用以下内容：

  #importARViewController.h
 
 @implementation CustomARFunction.m 
 
  - （ - void）yourMethod 
 {
 [ARViewController sharedInstance] .ARName = @New Name; 
} 
  

Hey guys, I wanna ask, what is sharedInstance actually? I mean what is the usage?

Currently I'm having some problem in communicating between 2 different files.

Here's my question: I have 1 file call A.h/A.m and another file call B.h/B.m A.h need to access some of the data in B.h, so .... is there any possible way I could achieve what I want? Just wonder is it "SharedInstance" able to solve my problem?

Looking for reply :)

解决方案

sharedInstance could be used for several ways.

For example you can access an object from a static context. Actually it is used most ways for supporting the Singleton-pattern. That means that just one object of the class is used in your whole program code, just one instance at all.

Interface can look like:

@interface ARViewController
{
}
@property (nonatomic, retain) NSString *ARName;

+ (ARViewController *) sharedInstance;

Implementation ARViewController:

@implementation ARViewController
static id _instance
@synthesize ARName;
...
- (id) init
{
    if (_instance == nil)
    {
        _instance = [[super allocWithZone:nil] init];
    }
    return _instance;
}

+ (ARViewController *) sharedInstance
{
    if (!_instance)
    {
        return [[ARViewController alloc] init];
    }
    return _instance;
}

And to access it, use the following in class CustomARFunction:

#import "ARViewController.h"

@implementation CustomARFunction.m

- (void) yourMethod
{
    [ARViewController sharedInstance].ARName = @"New Name";
}

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