Flash AS3类对象调用方法

Question

HI all, i have a class file named Main.as and another class calledr icon.as

package {

    import icon;
    public class main {
        public var _time:String;
        function main() {

            _time="01:10";
            iconObj=new icon(this);

        }
        function timerFunction() {
            _time=newTime;
        }
    }
}

package {

    public class icon {
        public var mytime:NUmber;
        function icon(mainObj:*) {

            trace("My time "+mainObj._time)

        }

    }
}

//sample outout

// My time 01:10

How do i get the current update from the main class without calling the MainObj repeatedly. Is this possible in Flash AS3, or any other alternate method for this idea.

Answer 1

Check out the Observer Pattern . You can have a clock which notifies its observers once the time changes.

Ther are already libraries simplifing this job for you like as3-signals . You can also use flash.events.EventDispatcher for the same task.

Answer 2

Store a reference to the Main class object locally in Icon

package 
{
    public class Icon 
    {
        public var mytime:NUmber;
        //store an instance of Main obj here.
        public var mainObj:Main;
        public function Icon(mainObj:Main) 
        {
           this.mainObj = mainObj;
        }
        //call this method whenever you want time
        public function readTime():void
        {
           trace("My time " + mainObj._time);
        }
    }
}