Question

尝试在按住按钮的同时让动画向后播放，这很好，但是当它到达第一帧时它会停止并且不会循环回到动画的最后一帧 - 如何一个完成这个？看起来我需要以某种方式打破一个帧的事件，然后再开始听......

backward_btn.addEventListener(MouseEvent.MOUSE_DOWN, setDownTrue);
backward_btn.addEventListener(MouseEvent.MOUSE_UP, setDownFalse);

addEventListener(Event.ENTER_FRAME, checkDown);

var isDown:Boolean = false;

function setDownTrue(e:MouseEvent){
    isDown = true;
}

function setDownFalse(e:MouseEvent){
    isDown = false;
}

function checkDown(e:Event){
    if(isDown == true){
        prevFrame();
        if(currentFrame == 1){
            gotoAndStop(120);  //120 is the last frame of the animation
            isDown = false;
        }
    }

}

谢谢！

Answer 1

ENTER_FRAME事件不是您的问题，它会继续触发。但是，isDown在最后一帧变为false。您应该在isDown = false;行之后将isDown = true;更改为gotoAndStop，以便不断循环播放。

Answer 2

我实际上只是帮助了一位同事：

myMovieClip //your instance on the stage

假设你想让你的movieclip在点击时向后播放：

myMovieClip.addEventListener(MouseEvent.CLICK, onClick);
function onClick(e:MouseEvent):void
{
    addEventListener(Event.ENTER_FRAME, playBackwards);
}

function playBackwards(e:Event):void
{
    var frame:int = myMovieClip.currentFrame -1; //get frame before current;
    myMovieClip.gotoAndStop(frame); // go to that frame
    if(frame == 1) removeEventListener(Event.ENTER_FRAME, playBackwards); //if the frame is the first frame then remove the enterframe event
}

Answer 3

为自己省点麻烦并使用totalFrames：

if(currentFrame == 1)
    gotoAndStop(totalFrames);

else prevFrame();

通过动画向后循环AS3

3 个答案: