How to change the deprecated function NSKeyedUnarchiver.unarchiveObject(with:) to unarchivedObjectOfClass:fromData:error: - Ios swift

RP89
March 9, 2023
172 views
0 votes
2 Answers

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 ?

Answers

- MickaelBelhassen
- March 9, 2023 at 9:50 am
- 0 votes
0
Replace the function by:
```
try? NSKeyedUnarchiver.unarchivedObject(ofClass: NSData.self, from: data) as? Data
```
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- vadian
- March 9, 2023 at 10:14 am
- 0 votes
0
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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