cocos gif图集播放

```

const {ccclass, property} = cc._decorator;

@ccclass
export default class NewClass extends cc.Component {

@property(cc.Sprite)
animSpriteFrame : cc.Sprite = null;

@property(cc.SpriteAtlas)
animAtlas : cc.SpriteAtlas = null;

@property
speed : number = 0.1;

@property
delay : number = 0;

@property
stopAtEmptyFrame : boolean = false;

@property
isLoop : boolean = true;

@property
playOnEnable : boolean = true;

@property
_index : number = 0;

@property([cc.SpriteFrame])
_spriteFrames : cc.SpriteFrame[] = [];

onEnable(){
    this._spriteFrames = this.animAtlas.getSpriteFrames();
    let atlasName = this.animAtlas.name.split(".")[0];

    this._spriteFrames.sort( (a,b) => 
        this._getIndex(a, atlasName) - this._getIndex(b, atlasName)
    );
    
    //console.log(this._spriteFrames);
    if(this.playOnEnable) this.playAnim();
}

onDisable(){
    this.stopAnim();
}

_getIndex(sprite : cc.SpriteFrame, atlasName : string) {
    return Number(sprite.name.substring(atlasName.length));
}

stopAnim(){
    this.unscheduleAllCallbacks();
}

playAnim(){
    this.scheduleOnce( ()=>{
        this.schedule(() => {
            this.animSpriteFrame.spriteFrame = this._spriteFrames[this._index];
            this._index++;
            if(this._index === this._spriteFrames.length - 1){
                this._index = 0;
                if(this.isLoop === false){
                    if(this.stopAtEmptyFrame) this.animSpriteFrame.spriteFrame = null;
                    this.stopAnim();
                }
                
            }
        }, this.speed);
    }, this.delay);
}

}