我需要获取图像,然后将其保存到 UserDefaults 以便能够检索它。但是,我尝试另存为 UIImage,但是当我尝试检索图像时,应用程序崩溃了。对我来说最好的方法是什么?
这就是我尝试保存图片的方式。
import UIKit
protocol dataReceivedDelegate {
func dataReceived(fotoSaved:[UIImage],nameSaved:NSArray)
}
class adicionarNovoItemVc: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITextFieldDelegate {
@IBOutlet weak var textFieldNome: UITextField!
let imagePicker = UIImagePickerController()
@IBOutlet weak var namePreview: UILabel!
@IBOutlet weak var imagePreview: UIImageView!
let picker = UIImagePickerController()
var arrayName = [String]()
var arrayFoto = [UIImage]()
var delegate:dataReceivedDelegate? = nil
override func viewDidLoad() {
super.viewDidLoad()
self.textFieldNome.delegate = self
// Do any additional setup after loading the view.
if isKeyPresentInUserDefaults(key: "namesSavedArray") == true{
arrayName = UserDefaults.standard.array(forKey: "namesSavedArray") as! [String]
}
if isKeyPresentInUserDefaults(key: "fotoSavedArray") == true{
arrayFoto = UserDefaults.standard.array(forKey: "fotoSavedArray") as! [UIImage]
}
}
func isKeyPresentInUserDefaults(key: String) -> Bool {
return UserDefaults.standard.object(forKey: key) != nil
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
if let image = info[.originalImage] as? UIImage {
self.imagePreview.image = image
self.namePreview.text = self.textFieldNome.text
}
self.picker.dismiss(animated: true, completion: nil)
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
self.textFieldNome.resignFirstResponder()
return true
}
@IBAction func botaoAdcItem(_ sender: UIButton) {
if (self.namePreview!.text != nil) && (self.imagePreview!.image != nil) {
if delegate != nil {
arrayName.append(self.namePreview.text!)
arrayFoto.append(self.imagePreview.image!)
delegate?.dataReceived(fotoSaved: arrayFoto, nameSaved: arrayName as NSArray)
UserDefaults.standard.set(arrayName, forKey: "namesSavedArray")
UserDefaults.standard.set(arrayFoto, forKey: "fotoSavedArray")
self.navigationController?.popViewController(animated: true)
}
}
else {return}
}
最佳答案
您不能也不应该将图像存储到 UserDefaults
。 UserDefaults
旨在保存简短的内容,例如用户输入的字符串或首选项设置。
它只能保存一个简短的数据类型列表(“属性列表”对象:Array、Dictionary、String、Data、Date、整数类型、浮点类型或 Bools)。任何其他数据类型都会失败。
我建议将图像保存到用户的 Documents 目录,然后在 UserDefaults
中保存文件的路径。
关于ios - 尝试在 USerDefault 中保存图像时我做错了什么,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51256305/