ios - 即使从图库或相机中选择新图像后，个人资料图像也不会更新

Question

大家好，提前感谢所有帮助我的人:)

我想让人们从图库中选择一张图片(比如个人资料图片)

即使退出应用程序，所选图像仍将保留... 当我回到应用程序时，我想查看我选择的图片 请问我该怎么做？

使用 Swift 4

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

        @IBOutlet weak var imageView: UIImageView!

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

            imageView.backgroundColor = UIColor.lightGray
        }

        func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
            dismiss(animated: true, completion: nil)
        }
        func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

            let image = info[UIImagePickerControllerOriginalImage] as! UIImage
            imageView.image = image
            imageView.contentMode = .scaleAspectFill

            dismiss(animated: true, completion: nil)
        }

        override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

            let controller = UIImagePickerController()
            controller.delegate = self
            controller.sourceType = .photoLibrary
            present(controller, animated: true, completion: nil)
        }
    }

Answer 1

当您选择任何图像时，您可以使用saveImage() 方法将图像保存在文档目录中。调用 getImage() 方法在 viewDidLoad 中获取图像并将其设置到 imageView。

func saveImage(_ image: UIImage) {
    let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.appendingPathComponent("Profile.jpg")

    let imageData = UIImageJPEGRepresentation(image, 0.8)
    try? imageData?.write(to: url!)
}

func getImage() -> UIImage? {
    let url = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.appendingPathComponent("Profile.jpg")

    if let data = try? Data(contentsOf: url!) {
        return UIImage(data: data)
    }
    return nil
}