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()  
 
//創建imageView 本地 文件中 網絡圖片獲取
        
        self.ChangeImage()
        
        
    }

    func ChangeImage() {
        
        imageChangeView.frame = CGRect(x: 100, y: 300, width: 200, height: 200)
        imageChangeView.backgroundColor = UIColor.blue
        
            //設置動畫
            imageChangeView.animationImages = [UIImage(named:"
 
1.jpg")!,UIImage (named:"2.jpg")!,UIImage (named:"3.jpg")!,UIImage (named:"4.jpg")!]
        
        //設置每間隔1秒 循環一次
        imageChangeView.animationDuration = 4
        //保持圖片比例\默認 UIImageView 會拉伸圖片使其占滿整個 UIImageView，如果不想讓圖片變形，可以將 ContentMode 設置為 ToFill充滿iamgeview、 AspectFit imageView內原比例。 AspectFill顯示原來比例，不足的imageview擴大
 

        imageChangeView.contentMode = .scaleToFill
        self.view.addSubview(imageChangeView)

        imageChangeView.startAnimating()
    }
    
    func CreatUI()  {
        
        //imageview創建
        imageView = UIImageView(image:UIImage(named:"1.jpg"))
        imageView.frame = CGRect(x: 100, y: 100, width: 200, height: 200)
        self.view.addSubview(imageView)
        
        
        //修改圖片
        imageView.image = UIImage(named:"2.jpg")
        
        
        //目錄中獲取圖片
        let path = Bundle.main.path(forResource:"3",ofType:"jpg")
        imageView.image = UIImage(contentsOfFile:path!)
        
        
        //網絡下載圖片
        let url = URL(string: "http://hangge.com/blog/images/logo.png")
        let  data  = try! Data (contentsOf:url!)//網上獲取數據流
        //通過水流初始化圖片
        let newImage = UIImage (data:data)
        imageView.image = newImage
        
        
        
        
        
        
        
        
        
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    

   

}

iOS Swift 模塊練習