代码片段:
// 预加载,第一个是场景名,第二个callback中3个参数,第三个callback是完成回调
cc.director.preloadScene('main', (completedCount, totalCount, item) => {
let p = completedCount / totalCount;
/**设置进度条进度, this.progress为进度条组件的节点 */
this.progress.progress = p;
}, () => {
cc.director.loadScene('main');
});