如何动态加载场景载入的进度条？

找一个加载条图片设置成背景不久可以了，内容没有显示的时候只会显示加载条，

网上记录的一段代码 还没有试过// Print on a guiText how much has been streamed level at index 1//在文本框打印在场景1里下载了多少？// When finished streaming, print "Level 1 has been fully streamed!"//当完成时，打印"Level 1 has been fully streamed!"var percentageLoaded : float = 0;function Update() { if(Application.GetStreamProgressForLevel(1) == 1) { guiText.text = "Level at index 1 has been fully streamed!"; } else { percentageLoaded = Application.GetStreamProgressForLevel(1) * 100; guiText.text = percentageLoaded.ToString(); }}