关于ios：从URL保存照片的最佳方法，快速

Best way to save photo from URL, swift

如何保存照片？迅速
哪种方法更好？

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@IBAction func savePhoto(_ sender: Any) {
let imageData = UIImagePNGRepresentation(myImg.image!)
let compresedImage = UIImage(data: imageData!)
UIImageWriteToSavedPhotosAlbum(compresedImage!, nil, nil, nil)

let alert = UIAlertController(title:"Saved", message:"Your image has been saved", preferredStyle: .alert)
let okAction = UIAlertAction(title:"Ok", style: .default)
alert.addAction(okAction)
self.present(alert, animated: true)
}
}

这应该对您有用。使用Leo Dabus的以下答案作为getDataFromUrl方法以从URL中获取数据：

别忘了将密钥Privacy - Photo Library Additions Usage Description添加到您的Info.plist中，并带有说明，以向用户解释为什么您需要访问照片库。

enter

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import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

@IBOutlet var imageView: UIImageView!

override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}

func getDataFromUrl(url: URL, completion: @escaping (Data?, URLResponse?, Error?) -> ()) {
URLSession.shared.dataTask(with: url) { data, response, error in
completion(data, response, error)
}.resume()
}

@IBAction func savePhoto(_ sender: UIButton) {

let yourImageURLString ="https://scontent-frx5-1.cdninstagram.com/t51.2885-15/e35/22794197_139950336649166_440006381429325824_n.jpg"

guard let yourImageURL = URL(string: yourImageURLString) else { return }

getDataFromUrl(url: yourImageURL) { (data, response, error) in

guard let data = data, let imageFromData = UIImage(data: data) else { return }

DispatchQueue.main.async() {
UIImageWriteToSavedPhotosAlbum(imageFromData, nil, nil, nil)
self.imageView.image = imageFromData

let alert = UIAlertController(title:"Saved", message:"Your image has been saved", preferredStyle: .alert)
let okAction = UIAlertAction(title:"Ok", style: .default)
alert.addAction(okAction)
self.present(alert, animated: true)
}
}

}
}