从 URL 将图像加载到图像单元格

Question

我正在学习快速编码。 我正在尝试将图像加载到位于图像井中的图像单元格上。我正在使用以下代码

import Cocoa

class ViewController: NSViewController {

    @IBOutlet weak var well: NSImageCell!
    @IBAction func clickme(_ sender: Any) {
    let image = NSImage(byReferencing:NSURL(string: "http://imgsv.imaging.nikon.com/lineup/lens/zoom/normalzoom/af-s_dx_18-140mmf_35-56g_ed_vr/img/sample/sample1_l.jpg")! as URL)
        well.image=image;
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override var representedObject: Any? {
        didSet {
        // Update the view, if already loaded.
        }
    }


}

不会引发异常，也不会加载任何图像。 我做错了什么？

Answer 1

试试这个。

简单的方法。

let url = NSURL(string:"your url")
        let imagedata = NSData.init(contentsOf: url! as URL)

        if imagedata != nil {
            imageView.image = UIImage(data:imagedata! as Data)
        }

创建扩展。

   extension UIImageView{

        func setImageFromURl(ImageUrl: String){

            if let url = NSURL(string: ImageUrl) {
                if let imagedata = NSData(contentsOf: url as URL) {
                    self.image = UIImage(data: imagedata as Data)
                }
            }
        }
    }

 //Use this extension

    imageView.setImageFromURl(ImageUrl: "your url")

使用 AFNetworking。

//without placeholder
    imageView.setImageWith(URL.init(string: "your url")!)
//with placeholder
    imageView.setImageWith(URL.init(string: "your url")!, placeholderImage: UIImage.init(named: "placeholder.png"))

使用 SDWebImage。

imageView.sd_setImage(with: URL(string: "your url"), placeholderImage: UIImage(named: "placeholder.png"))