car/assets/script/ui/announcement.ts

import { _decorator, Component, Node, Size, SpringJoint2D, Sprite, SpriteFrame, UITransform } from 'cc';
import { base_ui } from '../fw/base_ui';
import { tools } from '../tools';
const { ccclass, property } = _decorator;

@ccclass('announcement')
export class announcement extends base_ui {
    @property(Node) btn_close:Node = null
    @property(Node) empty:Node = null
    @property(Node) content_img:Node = null

    protected start(): void {
        this.onButtonListen(this.btn_close, ()=>{
            this.close()
        })

        let img_url = tools.sys_config.bulletin_img
        // console.log('img_url=',img_url)
        if(img_url.length<=0) {
            this.empty.active = true
        } else {
            tools.loadRemoteImg(img_url, (r)=>{
                this.showContentImg(r.sf)
                console.log(r.sf.width,r.sf.height)
            })
        }
    }

    private showContentImg(sf:SpriteFrame) {
        if(sf==null||sf==undefined) {
            this.empty.active = true
            return
        }
        this.empty.active = false
        let img_width = this.content_img.getComponent(UITransform).contentSize.width
        let bili = sf.width / sf.height
        let img_height = img_width / bili
        let img_size = new Size(img_width, img_height)
        this.content_img.getComponent(UITransform).setContentSize(img_size)
        this.content_img.getComponent(Sprite).spriteFrame = sf
    }
}