swift 实践- 09 -- UIImageVIew

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {

super.viewDidLoad()

let imageView = UIImageView.init(image: UIImage.init(named: "1"))

imageView.frame = CGRect(x: 10, y: 30, width: 300, height: 150)

self.view.addSubview(imageView)

// 从文件目录中获取图片

/*

let imagePath = Bundle.main.path(forResource: "ball", ofType: "png")

let newImage = UIImage(contentsOfFile: imagePath!)

let newImageView = UIImageView(image:newImage)

self.view.addSubview(newImageView)

*/

// 从网络地址获取图片

//定义URL对象

let url = URL(string: "http://hangge.com/blog/images/logo.png")

//从网络获取数据流

if let data = try? Data(contentsOf: url!) {

//通过数据流初始化图片

let newImage = UIImage(data: data)

let imageView2 = UIImageView(image:newImage);

imageView2.frame = CGRect.init(x: 10, y: 200, width: 300, height: 150)

self.view.addSubview(imageView2)

}else{

print("无法获取图片!")

}

// 保持图片比例

imageView.contentMode = .scaleAspectFit

}

override func didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

// Dispose of any resources that can be recreated.

}

}