目标C中的全局属性 [英] Global Property in Objective C

问题描述

  typedef enum {
 CalendarTypeMonth = 0，
 CalendarTypeWeek 
} CalendarType; 
  

然后在我的视图控制器中，我确定日历类型应该是什么并将其存储在属性中：

  @property（非原子）CalendarType myCalendarType; 
  

现在我希望我项目中的所有类都可以访问日历类型。我怎样才能设置这个属性是全球/外部，使所有的类都可以读取？

编辑：我知道enum的定义将在项目中可用。但是我感兴趣的是 myCalendarType 的值。如何访问所有类中myCalendarType的值？

解决方案

您可以声明类方法来访问静态变量。 >

将这些代码添加到您的实现文件中：

  static MyStaticType staticVar = MyStaticTypeDefault; 
 
 +（BOOL）myStaticVar 
 {
 return staticVar; 
} 
 
 +（void）setMyStaticVar：（MyStaticType）newValue 
 {
 staticVar = newValue; 
} 
  

然后在接口文件中为这些方法创建声明。
这比将所有静态值移动到AppDelegate好得多。
无论如何，很多变体都是可能的 - 例如，您可以创建singletone来存储应用程序的某些设置或使用CoreData。

I have an enum defined in the Constants.h file this way:

typedef enum {
    CalendarTypeMonth = 0,
    CalendarTypeWeek
} CalendarType;

Then in my view controller I determine what the calendar type should be and store it in a property this way:

@property (nonatomic) CalendarType myCalendarType;

Now I want all the classes in my project have access to the calendar type. How can I set this property to be global/extern so that all classes can read this?

EDIT: I know the definition of the enum will be available across the project. But what I am interested in is the value of myCalendarType. How can I access the value of myCalendarType across all classes?

解决方案

You can declare class method to access static variable.

Add such code to your implementation file:

static MyStaticType staticVar = MyStaticTypeDefault;

+(BOOL)myStaticVar
{
    return staticVar;
}

+(void)setMyStaticVar:(MyStaticType)newValue
{
    staticVar = newValue;
}

And create declarations for this methods in interface file. This is much better then moving all static values to AppDelegate. Anyway, a lot of variants are possible - for example, you can create singletone to store some settings of application or use CoreData.

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