Method init

packages/fairygui/src/tween/TweenManager.ts:96–100

()

    }

    private static init(): void {
        TweenManager._inited = true;
        TweenManager._lastTime = Timer.time;
        Timer.add(TweenManager.update, TweenManager);
    }

    private static update(): void {
        const currentTime = Timer.time;