carrot/assets/Script/Start.ts

import { _decorator, Component, Node, Vec3, tween,UIOpacity, director,Button, find } from 'cc';
const { ccclass, property } = _decorator;
@ccclass('Start')
export class Start extends Component {
    @property(Node)
    progressBar:Node = null;
    @property(Node)
    bar:Node = null;
    @property(Node)
    logoPic:Node = null;
    @property(Node)
    loadingPic:Node = null;
    @property(Node)
    updatePic:Node = null;
    start() {
        //this.bar.setScale(2,1);
        this.updatePic.getComponent(UIOpacity).opacity = 0;
        this.Logo();
    }
    Logo(){
        let opacityLogo = this.logoPic.getComponent(UIOpacity);
        tween(opacityLogo)
            .call(()=>{opacityLogo.opacity = 10;})
            .to(2,{opacity:255})
            .call(()=>{this.Loading();opacityLogo.opacity = 0;})
            .start();
    }
    Loading(){
        // let opacityLoadingPic = this.loadingPic.getComponent(UIOpacity);
        // let opacityProgressBar = this.progressBar.getComponent(UIOpacity);
        // tween(opacityLoadingPic)
        //     .call(()=>{opacityLoadingPic.opacity = 255})
        //     .start();
        // tween(opacityProgressBar)
        //     .call(()=>{opacityProgressBar.opacity = 255})
        //     .start();

        const setOpacity = (component,targetOpacity) => {
            const opacityComponent = component.getComponent(UIOpacity);
            tween(opacityComponent)
                .call(()=>{opacityComponent.opacity = targetOpacity;})
                .start();
        }

        setOpacity(this.loadingPic,255);
        setOpacity(this.progressBar,255);

        tween(this.bar)
            .call(()=>{this.bar.setScale(0,1)})
            .to(2,{scale:new Vec3(2,1)})
            .call(()=>{director.loadScene("LoginScene")})
            //.call(()=>{this.bar.setScale(1.5,1)})
            //.call(()=>{setOpacity(this.updatePic,255);setOpacity(this.loadingPic,0);setOpacity(this.progressBar,0);})
            .start();
    }
    onBtnLogin(){
        director.loadScene("SelectScene");
    }
    update(deltaTime: number) {
    }
}


// Loading() {  
//     const setOpacity = (component, targetOpacity) => {  
//         const opacityComponent = component.getComponent(UIOpacity);  
//         tween(opacityComponent)  
//             .call(() => { opacityComponent.opacity = targetOpacity; })  
//             .start();  
//     };  

//     setOpacity(this.loadingPic, 255);  
//     setOpacity(this.progressBar, 255);  

//     tween(this.bar)  
//         .call(() => { this.bar.setScale(0, 1); })  
//         .to(2, { scale: new Vec3(2, 1) })  
//         .start();  
// }