[0]适配版spine实现替换骨骼图片

首先原则是不想破坏官方提供的代码，这样更新引擎会非常麻烦。
但是，最终还是添加了引擎提供的代码。
用hook的方式，对class添加方法，修改引擎代码，进行渲染。
其实现效率不高，还没有找到缓存的方式。如果有更好的思路或者缓存方式，请私信我。
下面是hook代码的实现

Laya.SpineSkeleton.prototype.replaceSkin = function (slotName, texture) {

    if (!this.skeletonRenderer._diySkin){

        this.skeletonRenderer._diySkin = {}

    }

    this.skeletonRenderer._diySkin[slotName] = {

        texture: texture,

        uv:{}

    }

}

下面是修改引擎代码的实现

if (this._diySkin && this._diySkin[slot.data.name]) {

							let _texture = this._diySkin[slot.data.name].texture;

							let tuvs = [];

							if (tuvs.length == 0) {

								let _smallTexture = Laya.Texture.createFromTexture(texture, attachment.region.renderObject.x,

									attachment.region.renderObject.y, attachment.region.renderObject.width, attachment.region.renderObject.height);

								tuvs = Laya.UVTools.getRelativeUV(_smallTexture.uv, mUVs, tuvs);

								tuvs = Laya.UVTools.getAbsoluteUV(_texture.uv, tuvs, tuvs);

							}

							mUVs = tuvs;

							texture = _texture

						}

	                    spineSkeletonIns.graphics.drawTriangles(texture, 0, 0, mVertices, mUVs, new Uint16Array(triangles), Laya.Matrix.EMPTY, colors[3], color, blendMode, colorNum);

附带添加了cocos creator在骨骼上添加节点的思路，完全是hook的方式，如果没有改骨骼图片的需求，直接使用即可。

const oldUpdate = Laya.SpineSkeleton.prototype._update;



Laya.SpineSkeleton.prototype._update = function () {

    if (!this.attachNode) {

        this.attachNode = new Laya.Sprite()

        this.attachNode.name = "root"

        this.addChild(this.attachNode)

        this.child4AttachNodeMap = {};

    }

    oldUpdate.apply(this, arguments);

    for (let bone of this.skeleton.bones) {

        let boneName = bone.data.name

        if (boneName != "root") {

            let child = this.attachNode.getChildByName(boneName)

            if (!child) {

                child = new Laya.Sprite()

                child.name = boneName

                this.attachNode.addChild(child)

            }

            child.x = bone.x

            child.y = -bone.y

            child.scaleX = bone.scaleX

            child.scaleY = bone.scaleY

            child.rotation = bone.rotation



            if (this.child4AttachNodeMap[boneName]) {

                for (let attachChild of this.child4AttachNodeMap[boneName]) {

                    if (!attachChild.destroyed) {

                        child.addChild(attachChild)

                    }

                }

                this.child4AttachNodeMap[boneName] = []

            }

            // child.graphics.drawRect(0,0,10,10,"#6a9c5a")

        }

    }

}



Laya.SpineSkeleton.prototype.addChild2AttachNodeByName = function (_name, _child) {

    if (!this.child4AttachNodeMap[_name]) {

        this.child4AttachNodeMap[_name] = []

    }

    this.child4AttachNodeMap[_name].push(_child)

}