项目 logomove0114

AppDelegate.swift

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        
        //登录动画执行完成后显示本处的背景图
        let bgImageView = UIImageView()
        //设置图片
        bgImageView.image = UIImage(named: "bg0114-2")
        //设置图片位置及尺寸
        bgImageView.frame = CGRect(x: 0, y: 0, width: (window?.frame.width)!, height: (window?.frame.height)!)
        //视图框加载到window
        window?.addSubview(bgImageView)
        
        return true
    }

ViewController.swift

//
//  ViewController.swift
//  lggomove0114
//
//  Created by Mac on 1/14/19.
//  Copyright © 2019 wjb. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

//创建登录 logo，进入页面后动作——变小——变大 ，最终显示背景图
    //创建图片框
    let logoImageView = UIImageView()
        
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        //设置view的背景色
        view.backgroundColor = UIColor.blue
        //加载logo图片
        logoImageView.image = UIImage(named: "logo0114")
        //设置图片框大小
        logoImageView.frame = CGRect(x: 0, y: 0, width: 200, height: 200)
        //重设图片框的中心点
//        logoImageView.center.x = view.center.x
//        logoImageView.center.y = view.center.y
        
        //简写
        logoImageView.center = view.center
        
        //图片框添加到view
        view.addSubview(logoImageView)
        
    }
    
    //扩展动画
    override func viewDidAppear(_ animated: Bool) {
        
        UIView.animate(withDuration: 2, animations: {
            //logo变小
            self.logoImageView.frame = CGRect(x: 0, y: 0, width: 100, height: 100)
            
            self.logoImageView.center = self.view.center
            
            
        }) { (finshed) in
            
            //logo变大
            UIView.animate(withDuration: 2, animations: {
                //logo变大
                self.logoImageView.frame = CGRect(x: 0, y: 0, width: 10000, height: 10000)
                
                self.logoImageView.center = self.view.center
                
                //view 透明
                self.view.alpha = 0
            })
            
        }
        
        
    }


}