[英]Swift Codable protocol… encoding / decoding NSCoding classes
我有以下結構......
struct Photo: Codable {
let hasShadow: Bool
let image: UIImage?
enum CodingKeys: String, CodingKey {
case `self`, hasShadow, image
}
init(hasShadow: Bool, image: UIImage?) {
self.hasShadow = hasShadow
self.image = image
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
hasShadow = try container.decode(Bool.self, forKey: .hasShadow)
// This fails
image = try container.decode(UIImage?.self, forKey: .image)
}
func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
try container.encode(hasShadow, forKey: .hasShadow)
// This also fails
try container.encode(image, forKey: .image)
}
}
編碼Photo
失敗了......
可選不符合Encodable,因為UIImage不符合Encodable
解碼失敗了......
期待非可選類型時找不到鍵可選擇編碼鍵\\“image \\”“))
有沒有辦法編碼包含符合NSCoding
( UIImage
, UIColor
等)的NSObject
子類屬性的Swift對象?
感謝@vadian指點我編碼/解碼Data
...
class Photo: Codable {
let hasShadow: Bool
let image: UIImage?
enum CodingKeys: String, CodingKey {
case hasShadow, imageData
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
hasShadow = try container.decode(Bool.self, forKey: .hasShadow)
if let imageData = try container.decodeIfPresent(Data.self, forKey: .imageData) {
image = NSKeyedUnarchiver.unarchiveObject(with: imageData) as? UIImage
} else {
image = nil
}
}
func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
try container.encode(hasShadow, forKey: .hasShadow)
if let image = image {
let imageData = NSKeyedArchiver.archivedData(withRootObject: image)
try container.encode(imageData, forKey: .imageData)
}
}
}
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