我正在尝试使用 codable 在 iOS 应用程序中快速保存来自 textFields 的一些数据，但是当我定义用于归档的函数时，xcode 告诉我“无法推断通用参数‘值’”。
我正在学习归档，如果有人能帮助我，我将非常感激。
这是我正在使用的代码
class ProfileViewController: UITableViewController {
var currentProfile: Profile?
@IBOutlet weak var name: UITextField!
@IBOutlet weak var surname: UITextField!
@IBAction func saveProfileButton(_ sender: Any) {
addCurrentProfile()
saveProfile()
}
func addCurrentProfile(){
currentProfile?.name = name.text ?? ""
currentProfile?.surname = surname.text ?? ""
}
struct Profile {
var name: String
var surname: String
enum CodingKeys: String, CodingKey {
case name
case surname
}
init(name:String, surname:String) {
self.name = name
self.surname = surname
}
func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
try container.encode(name, forKey: .name)
try container.encode(surname, forKey: .surname)
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
name = try container.decode(String.self, forKey: .name)
surname = try container.decode(String.self, forKey: .surname)
}
}
func saveProfile() {
do {
let data = try PropertyListEncoder().encode(currentProfile)
let success = NSKeyedArchiver.archiveRootObject(data, toFile: profile_data.path)
print(success ? "Successful save" : "Save Failed")
} catch {
print("Save Failed")
}
}
}
最佳答案
首先是让你的结构确认 Codable 协议(protocol)，例如:
struct Profile:Codable {
var name: String
var surname: String
enum CodingKeys: String, CodingKey {
case name
case surname
}
init(name:String, surname:String) {
self.name = name
self.surname = surname
}
func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
try container.encode(name, forKey: .name)
try container.encode(surname, forKey: .surname)
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
name = try container.decode(String.self, forKey: .name)
surname = try container.decode(String.self, forKey: .surname)
}
}
然后，您可以使用 PropertyListEncoder 实现对象，如下所示:
func saveProfile() {
do {
let data = try PropertyListEncoder().encode(currentProfile)
let success = NSKeyedArchiver.archiveRootObject(data, toFile: profile_data.path)
print(success ? "Successful save" : "Save Failed")
} catch {
print("Save Failed")
}
}
关于ios - 使用 Codable 与 Swift 归档，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54138982/