问题概况:IOS 项目中遇到一个问题，wkweview 上加载一个threejs 的页面.threejs 本身的旋转，缩放，平移事件都自动转换到移动端的各种手势上。只有双击选中模型事件一直无法实现，pc端双击选中模型没有问题。
threejs 中的双击事件:
1、添加双击事件
document.addEventListener('dblclick', clickHandler, false);
2、双击事件实现
function clickHandler(event) {

event.preventDefault();

reviewMaterial();
selectedModel = null;


var vector = new THREE.Vector3((event.clientX / window.innerWidth) * 2 - 1, -(event.clientY / window.innerHeight) * 2 + 1, 0.5);
projector.unprojectVector(vector, JKBIM.camera);



var raycaster = new THREE.Raycaster(JKBIM.camera.position, vector.sub(JKBIM.camera.position).normalize());

intersects = raycaster.intersectObjects(targetList);

if (intersects.length > 0) {


    var j = 0;
    while (j < intersects.length) {


        if (intersects[j].object.type == "Sprite") {


            break;


        }


        //FOR MESHES:
        if (!$.isEmptyObject(intersects[j].object.userData)) {


            if (lastMeshMaterial != -1) {
                //reset last material for last lastMeshID
                for (var i = 0; i < JKBIM.scene.children.length; i++) {
                    if (JKBIM.scene.children[i].id == lastMeshID) {
                        JKBIM.scene.children[i].material = lastMeshMaterial;
                    }
                }
            }
            //set lastMaterial
            if (objuuid == bimId) {
                lastMeshMaterial = lastsMeshMaterial;

            } else {

                lastMeshMaterial = intersects[j].object.material;
            }
            //set lastMeshID
            lastMeshID = intersects[j].object.id;

            //apply SelMaterial
            intersects[j].object.material = selMaterial;



            break;
        }
        //FOR OBJECT3D
        if (!$.isEmptyObject(intersects[j].object.parent.uuid)) {
            if (intersects[j].object.parent.visible) {

         
                selectedModel = intersects[j];
                objuuid = intersects[j].object.parent.uuid;
            
               

                objId = intersects[j].object.parent.name.split('<')[1].split(' ')[0];
                if (objuuid == bimId) {
                    lastObjectMaterial = lastsMeshMaterial;

                } else {
                    //set lastMaterial
                    lastObjectMaterial = intersects[j].object.material;
                }
                //set lastObjectID
                lastObjectID = intersects[j].object.parent.id;

                //apply SelMaterial
                intersects[j].object.material = selMaterial;
                Mname = intersects[j].object.parent.name;
                //获取objId
                objId = intersects[j].object.parent.name.split('<')[1].split(' ')[0];
                //获取objName
                objName = intersects[j].object.parent.name.split(' ')[1].split(' ')[0];
             
                break;
            }
        }

        j++;
    }
    
}

}

解决： 通过在wkwebview 中增加双击手势，获取到触摸点，并将触摸点通过js交互发送到threejs 中的方法中实现双击。手势实现时需要注意：
增加回调：- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
否则无法实现，这是因为webview内部实现了手势。
接受坐标的双击方法由上面的方法改造就可以了。