创建一个全球课堂目标-C？ [英] creating a global class objective-c?

问题描述

我想用已经存储的数据在objective-c中创建一个类，以便访问数据时我不想实例化类。我怎么做到这一点？

I want to create a class in objective-c with already stored data, so that for accessing the data I don't want to instantiate the class. how can I do it?

推荐答案

你可以使用单例，或者你可以使用仅由类方法构成的类并给你访问静态数据。

You can use a singleton or you can use a class made only of class methods and giving you access to static data.

以下是ObjC中的一个基本单例实现：

Here is a basic singleton implementation in ObjC:

@interface MySingleton : NSObject
{
}

+ (MySingleton *)sharedSingleton;

@property(nonatomic) int prop;
-(void)method;

@end

@implementation MySingleton
@synthesize prop;

+ (MySingleton *)sharedSingleton
{ 
  static MySingleton *sharedSingleton;

  @synchronized(self)
  {
    if (!sharedSingleton)
      sharedSingleton = [[MySingleton alloc] init];

    return sharedSingleton;
  }
}

-(void)method {

}

@end

您可以像这样使用它：

and you use it like this:

int a = [MySingleton sharedSingleton].prop

[[MySingleton sharedSingleton] method];

基于类的方法类为：

The class method based class would be:

@interface MyGlobalClass : NSObject

+ (int)data;

@end

@implementation MySingleton

static int data = 0;
+ (int)data
{ 
   return data;
}

+ (void)setData:(int)d
{ 
   data = d;
}

@end

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