Preload progress

darksepho · December 11, 2017, 3:49pm

Hi, is there a way to know the current progress of cc.director.preloadScene? I would like to show a loading bar

PZsolt27 · December 11, 2017, 4:06pm

Hi,

instead of cc.director.preloadScene use cc.loader.load directly, it has progressCallback. Here is the documentation:

http://www.cocos2d-x.org/docs/creator-api/en/classes/loader.html#load

By the way, preloadScene uses cc.loader.load function, here is the sample:

github.com

cocos-creator/engine/blob/master/cocos2d/core/CCDirector.js#L747


            ensureAsync = true;
        }
        else {
            this._loadSceneByUuid(uuid, onLaunched, _onUnloaded);
        }
        return true;
    }
    else {
        cc.errorID(1209, sceneName);
        return false;
    }
},


/**
 * !#en
 * Preloads the scene to reduces loading time. You can call this method at any time you want.
 * After calling this method, you still need to launch the scene by `cc.director.loadScene`.
 * It will be totally fine to call `cc.director.loadScene` at any time even if the preloading is not
 * yet finished, the scene will be launched after loaded automatically.
 * !#zh 预加载场景，你可以在任何时候调用这个方法。
 * 调用完后，你仍然需要通过 `cc.director.loadScene` 来启动场景，因为这个方法不会执行场景加载操作。

Best regards,
Zsolt

darksepho · December 11, 2017, 4:24pm

Thanks, seems perfect.
What’s the point of cc.director.preloadScene then? it’s a bit confusing

PZsolt27 · December 11, 2017, 4:30pm

You’re welcome!

Ermmm… I don’t know…

skara · December 11, 2017, 8:01pm

Preload scene is useful when you want to swap scenes without showing a loading bar.

You initiate preloadScene during some other part of your game when you know a scene change would be coming soon, such as your player has entered into a zone or initiated a trigger.

darksepho · December 12, 2017, 8:54am

Wait, now that I’m trying it I’m not sure this is what I need.
cc.loader.load loads resources by their names, not an entire scene. Do I have to iterate through them manually? How do I get the resource list of another scene?

PZsolt27 · December 12, 2017, 9:12am

Hi,

please check the following code:

github.com

cocos-creator/engine/blob/master/cocos2d/core/CCDirector.js#L747


            ensureAsync = true;
        }
        else {
            this._loadSceneByUuid(uuid, onLaunched, _onUnloaded);
        }
        return true;
    }
    else {
        cc.errorID(1209, sceneName);
        return false;
    }
},


/**
 * !#en
 * Preloads the scene to reduces loading time. You can call this method at any time you want.
 * After calling this method, you still need to launch the scene by `cc.director.loadScene`.
 * It will be totally fine to call `cc.director.loadScene` at any time even if the preloading is not
 * yet finished, the scene will be launched after loaded automatically.
 * !#zh 预加载场景，你可以在任何时候调用这个方法。
 * 调用完后，你仍然需要通过 `cc.director.loadScene` 来启动场景，因为这个方法不会执行场景加载操作。

The cc.loader.load function loads based on the uuid of the Scene.

Best regards,
Zsolt

darksepho · December 12, 2017, 10:42am

Got it, basically I simply had to copy preloadScene code. Many thanks!
One more thing: what tells me the current progress in the progress callback?

EDIT
I see there are completedCount and totalCount but total is just 1 (because I pass the whole scene, I guess)

PZsolt27 · December 12, 2017, 1:10pm

You should know for example the number of Nodes in the Scene file to be able to display some loading bar… Hmmm…