iOS Swift 模块练习

1、UIImageView + UIImage

import UIKit

class UIImageViewViewController: UIViewController {

    var imageView = UIImageView()
    var imageChangeView = UIImageView()

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.

        self.CreatUI()  //创建imageView 本地 文件中 网络图片获取

        self.ChangeImage()

    }

    func ChangeImage() {

        imageChangeView.frame = CGRect(x: 100, y: 300, width: 200, height: 200)
        imageChangeView.backgroundColor = UIColor.blue

            //设置动画
            imageChangeView.animationImages = [UIImage(named:"1.jpg")!,UIImage (named:"2.jpg")!,UIImage (named:"3.jpg")!,UIImage (named:"4.jpg")!]

        //设置每间隔1秒 循环一次
        imageChangeView.animationDuration = 4
        //保持图片比例\默认 UIImageView 会拉伸图片使其占满整个 UIImageView，如果不想让图片变形，可以将 ContentMode 设置为 ToFill充满iamgeview、 AspectFit imageView内原比例。 AspectFill显示原来比例，不足的imageview扩大
        imageChangeView.contentMode = .scaleToFill
        self.view.addSubview(imageChangeView)

        imageChangeView.startAnimating()
    }

    func CreatUI()  {

        //imageview创建
        imageView = UIImageView(image:UIImage(named:"1.jpg"))
        imageView.frame = CGRect(x: 100, y: 100, width: 200, height: 200)
        self.view.addSubview(imageView)

        //修改图片
        imageView.image = UIImage(named:"2.jpg")

        //目录中获取图片
        let path = Bundle.main.path(forResource:"3",ofType:"jpg")
        imageView.image = UIImage(contentsOfFile:path!)

        //网络下载图片
        let url = URL(string: "http://hangge.com/blog/images/logo.png")
        let  data  = try! Data (contentsOf:url!)//网上获取数据流
        //通过水流初始化图片
        let newImage = UIImage (data:data)
        imageView.image = newImage

    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}