如何在 Objective-C 中声明静态变量? [英] How to declare static variables in Objective-C?

问题描述

谁能告诉我们如何将静态变量声明为 Objective C 类的一部分?我想让它跟踪我用这个类创建的实例数量.

Can someone tell how we can declare a static variable as part of a Objective C class? I wanted this to track the number of instances I am creating with this Class.

推荐答案

使用您班级的 +initialize 方法:

Use your class's +initialize method:

@implementation MyClass

static NSUInteger counter;

+(void)initialize {
    if (self == [MyClass class]) {
        counter = 0;
    }
}

@end

(更新为添加 if (self == [MyClass class]) 条件，如评论中建议的那样.)

(Updated to add if (self == [MyClass class]) conditional, as suggested in comments.)

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