031_swift_闭包的实际应用

//
//  ViewController.swift
//  DemoApp
//
//  Created by liuan on 2020/4/23.
//  Copyright © 2020 anguo.com. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    var animationView:UIView!
    override func viewDidLoad()
    {
        super.viewDidLoad()

        Timer.scheduledTimer(withTimeInterval: 1.0, repeats: false) { (timer:Timer) in
            print("Timer action...")
            //在动画中的使用
            self.animationView=UIView(frame: CGRect(x: 0, y: 40, width: 20, height: 50))
            self.animationView.backgroundColor = .orange
            self.view.addSubview(self.animationView)
            UIView.animate(withDuration: 1.0, animations: {
                self.animationView.frame=CGRect(x: 200, y: 40, width: 50, height: 50)
            }){(end:Bool) in
                print("Animation done.")
            }
            
        }
        //在线程中
        Thread.detachNewThread {
            print("分离一个新的线程，并在新的线程中执行闭包语句中的任务")
        }
        //在调度对立中。异步执行闭包语句中的任务
        DispatchQueue.main.async{
        print("DispatchQueue.main.async")
        }
        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now()+2.0) {
            print("等待两s后，异步执行闭包语句中的任务，")
        }
        
    }


}