TiktokMagicBox/assets/FitWindow.ts

import { _decorator, Component, View, UITransform, log } from 'cc';
const { ccclass, property } = _decorator;

@ccclass('Start')
export class Start extends Component {
    start() {
        let windowSize = View.instance.getVisibleSize();
        let WinHeight = windowSize.height;
        const uiTransform = this.getComponent(UITransform);

        uiTransform.setContentSize(900, WinHeight);
        uiTransform.setAnchorPoint(0.5, 1);
        this.node.setPosition(0, WinHeight/2);
    }
}