从URL保存照片的最佳方式,swift [关闭]
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如何保存照片?在swift中哪种方式更好?
@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)
}
}
答案
这应该适合你。使用this answer的Leo Dabus作为getDataFromUrl
方法从URL获取数据:
不要忘记将密钥Privacy - Photo Library Additions Usage Description
添加到您的Info.plist
,并附上说明,向用户解释您需要访问照片库的原因。
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)
}
}
}
}
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