[英]Saving an image array with UserDefaults
我有一個應用程序,用戶拍照,一旦拍照,它應保存到UserDefaults
。 我一直收到這個錯誤:
"cannot invoke 'setObject' with an argument list of type '(UIImage. type, forKey:[UIImage])'"
我在這里搜索了文檔和帖子,但沒有任何幫助。 這是我的代碼。
let defaults = NSUserDefaults.standardUserDefaults()
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
picker.dismissViewControllerAnimated(true, completion: nil)
switch currentClothesSelection!{
case "1":
shirts.append(info[UIImagePickerControllerOriginalImage] as! UIImage)
//this is where the error occurs
defaults.setObject(UIImage.self, forKey: array1)
case "2" :
pants.append(info[UIImagePickerControllerOriginalImage] as! UIImage)
case "3" :
shorts.append(info[UIImagePickerControllerOriginalImage] as! UIImage)
case "4" :
jackets.append(info[UIImagePickerControllerOriginalImage] as! UIImage)
case "5" :
shoes.append(info[UIImagePickerControllerOriginalImage] as! UIImage)
default:
break
}
編輯/更新:
Xcode 10.1•Swift 4.2.1或更高版本
在NSUserDefaults存儲圖像不是一個好主意,但如果你真的想這樣做,你需要存儲為NSData。
value參數只能是屬性列表對象:NSData,NSString,NSNumber,NSDate,NSArray或NSDictionary。 對於NSArray和NSDictionary對象,其內容必須是屬性列表對象
我建議將它本地保存到Documents文件夾中的磁盤。 如果你真的想把它保存到NSUserDefaults,我建議只使用小圖片並自行承擔風險:)你可以這樣做:
extension UserDefaults {
func set(image: UIImage?, quality: CGFloat = 0.5, forKey defaultName: String) {
guard let image = image else {
set(nil, forKey: defaultName)
return
}
set(image.jpegData(compressionQuality: quality), forKey: defaultName)
}
func image(forKey defaultName:String) -> UIImage? {
guard
let data = data(forKey: defaultName),
let image = UIImage(data: data)
else { return nil }
return image
}
func set(images value: [UIImage]?, forKey defaultName: String) throws {
guard let value = value else {
removeObject(forKey: defaultName)
return
}
try set(NSKeyedArchiver.archivedData(withRootObject: value, requiringSecureCoding: false), forKey: defaultName)
}
func images(forKey defaultName: String) throws -> [UIImage] {
guard let data = data(forKey: defaultName) else { return [] }
let object = try NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data)
return object as? [UIImage] ?? []
}
}
測試:
let image = UIImage(data: try! Data(contentsOf: URL(string: "https://i.stack.imgur.com/Xs4RX.jpg")!))!
UserDefaults.standard.set(image: image, forKey: "imageKey")
if let loadedImage = UserDefaults.standard.image(forKey: "imageKey") {
print(loadedImage.size) // "(719.0, 808.0)"
}
let images = [image, image]
try? UserDefaults.standard.set(images: images, forKey: "imagesKey")
if let loadedImages = try? UserDefaults.standard.images(forKey: "imagesKey") {
print(loadedImages.count) // 2
}
在NSUserDefaults中保存blob數據將對您的應用程序造成巨大的性能損失。 您有兩種選擇:
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