英文:
How to change the deprecated function NSKeyedUnarchiver.unarchiveObject(with:) to unarchivedObjectOfClass:fromData:error:
问题
在我的应用程序中，登录后获取的用户数据保存在偏好设置中，如下所示。Xcode显示警告，指出从iOS 12开始，NSKeyedUnarchiver.unarchiveObject(with:) 和 NSKeyedArchiver.archivedData(withRootObject:) 已弃用。但是应用程序在最新的iOS版本上仍然正常运行。为了使其更稳定，我应该如何将其更改为建议使用的 unarchivedObjectOfClass:fromData:error: 方法？
static var userLoginResponse: LoginModel? {
get {
if let data = UserDefaults.standard.data(forKey: "userLoginResponse") {
do {
return try NSKeyedUnarchiver.unarchivedObject(ofClasses: [LoginModel.self], from: data)
} catch {
print("Failed to unarchive userLoginResponse: \(error)")
return nil
}
}
return nil
}
set {
if let value = newValue?.toJsonData() {
do {
let archivedData = try NSKeyedArchiver.archivedData(withRootObject: value, requiringSecureCoding: false)
UserDefaults.standard.set(archivedData, forKey: "userLoginResponse")
} catch {
print("Failed to archive userLoginResponse: \(error)")
}
} else {
UserDefaults.standard.set(nil, forKey: "userLoginResponse")
}
}
}
根据苹果文档的建议，使用 unarchivedObjectOfClass:fromData:error: 方法可以反序列化保存为 NSCoded 对象的数据。如何更改现有实现，而不影响现有的应用程序用户？
英文:
In my application, the user data getting after login is saved in the preferences as below. The xcode shows the warning that NSKeyedUnarchiver.unarchiveObject(with:) and NSKeyedArchiver.archivedData(withRootObject:) are deprecated from iOS 12. But application is working fine till the latest iOS versions. To make it stable, how can I change it to unarchivedObjectOfClass:fromData:error: which is recommended.
static var userLoginResponse : LoginModel? {
get {
if let data = UserDefaults.standard.data(forKey: "userLoginResponse"), let respData = NSKeyedUnarchiver.unarchiveObject(with: data) as? Data {
return LoginModel(data: respData)
}
return nil
}
set {
if let value = newValue?.toJsonData() {
UserDefaults.standard.setValue(NSKeyedArchiver.archivedData(withRootObject: value), forKey: "userLoginResponse")
} else {
UserDefaults.standard.setValue(nil, forKey: "userLoginResponse")
}
}
}
As per the apple documentation, unarchivedObjectOfClass:fromData:error: will unarchive the data saved as NSCoded object. How can I change this existing implementation without affect the existing app users ?
答案1
得分: 1
尝试将函数替换为：
try? NSKeyedUnarchiver.unarchivedObject(ofClass: NSData.self, from: data) as? Data
英文:
Replace the function by:
try? NSKeyedUnarchiver.unarchivedObject(ofClass: NSData.self, from: data) as? Data
答案2
得分: 1
你打算归档已经符合 PropertyList 标准的 Data。移除 NSKeyed(Un)archiver 部分。
static var userLoginResponse: LoginModel? {
get {
guard let data = UserDefaults.standard.data(forKey: "userLoginResponse") else { return nil }
return LoginModel(data: data)
}
set {
UserDefaults.standard.set(newValue?.toJsonData(), forKey: "userLoginResponse")
}
}
附注：除非你是指使用 KVC（你不是），否则永远不要使用 setValue(_:forKey:)。
英文:
You are going to archive Data which is already PropertyList compliant. Remove the NSKeyed(Un)archiver stuff.
static var userLoginResponse : LoginModel? {
get {
guard let data = UserDefaults.standard.data(forKey: "userLoginResponse") else { return nil }
return LoginModel(data: data)
}
set {
UserDefaults.standard.set(newValue?.toJsonData(), forKey: "userLoginResponse")
}
}
Side-note: Never use setValue(_:forKey:) unless you mean KVC (you don't).
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