如何从内部类访问变量

 //MainClass.m 

 @interface InnerClass : NSObject{

 }
 @end

 @implementation InnerClass

 -(void)run{
      while(isActive){//want to access this variable which defined in MainClass
      //do something
      }
 }

 @end

 @interface MainClass : NSObject{
      BOOL isActive;
 }
 @end

 @implementation MainClass


 @end

我有MainClass，它有一个内部类(InnerClass).我想从内部类访问MainClass类中定义的布尔类型变量(isActive).我想做的是，内部类将在单独的线程上运行，并将继续检查主类上的isActive变量，如果isActive为false，则它将停止运行新线程. /p>

I have MainClass and it has an inner class (InnerClass). I want to access the boolean type variable (isActive) defined in MainClass class from the inner class. What I am trying to do is that the inner class will run on a separate thread and will keep checking the isActive variable on the main class and if isActive is false then it will stop running the new thread.. Thanks in advance...