[]iphoneX环境下新手引导的抠图透明区域为黑色，其它机型都是正常的。

this.guideContainer = new Sprite();
this.guideContainer.cacheAs = "bitmap";
Utils.GuideLayer.addChild(this.guideContainer);

this.guideContainer.on(Laya.Event.CLICK, this, this.nextStep);
this.mouseEnabled = false;

var maskArea: Laya.Sprite = new Laya.Sprite();
maskArea.alpha = 0.5;
maskArea.graphics.drawRect(0, 0, Laya.stage.width, Laya.stage.height, "#000000");
maskArea.name = "maskArea";
this.guideContainer.addChild(maskArea);

this.interactionArea = new Laya.Sprite();
this.interactionArea.blendMode = "destination-out";
this.guideContainer.addChild(this.interactionArea);

this.guideHitArea = new Laya.HitArea();
this.guideHitArea.hit.drawRect(0, 0, Laya.stage.width, Laya.stage.height, "#000000");

this.guideContainer.hitArea = this.guideHitArea;
this.guideContainer.mouseEnabled = true;

this.tipContainer = new Laya.Sprite();
Utils.GuideLayer.addChild(this.tipContainer);

this.interactionArea.graphics.clear();
this.interactionArea.graphics.drawCircle(pos.x+target.width*scale*0.5, pos.y+target.height*scale*0.5, step.radius * scale, "#000000");