如何走动'；未归档对象（带：）'；在iOS 12.0中设置HKQueryAnchor时是否已弃用？

我在制作

HKAnchoredObjectQuery

时使用了下面的代码来设置

HKQueryAnchor

，但是“unarchiveObject（with:）”已被弃用，我不知道如何使用新的API编写它

private func getAnchor() -> HKQueryAnchor? {
        let encoded = UserDefaults.standard.data(forKey: AnchorKey)
        if(encoded == nil){
            return nil
        }
        
        let anchor = NSKeyedUnarchiver.unarchiveObject(with: encoded!) as? HKQueryAnchor
        return anchor
    }
    
    private func saveAnchor(anchor : HKQueryAnchor) {
        let encoded = NSKeyedArchiver.archivedData(withRootObject: anchor)
        defaults.setValue(encoded, forKey: AnchorKey)
        defaults.synchronize()
    }

---

尝试使用

JSONDecoder

和

jsonecoder

从

HKQueryAnchor

实例获取

数据，即

private func getAnchor() -> HKQueryAnchor? {
    guard let encoded = UserDefaults.standard.data(forKey: AnchorKey) else {
        return nil
    }

    let anchor = try? JSONDecoder().decode(HKQueryAnchor.self, from: encoded)
    return anchor
}

private func saveAnchor(anchor : HKQueryAnchor) {
    if let encoded = try? JSONEncoder().encode(anchor) {
        defaults.setValue(encoded, forKey: AnchorKey)
        defaults.synchronize()
    }
}

这是我根据Martin R的链接得出的，好吗

 private func getAnchor() -> HKQueryAnchor? {
    
       

 let encoded = UserDefaults.standard.data(forKey: AnchorKey)
    
    guard let unwrappedEncoded = encoded else { return nil }
    
    guard let anchor = try? NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(unwrappedEncoded as Data) as? HKQueryAnchor
    else {
        return nil
    }
    
    return anchor
}

private func saveAnchor(anchor : HKQueryAnchor) {
    
    do {
        let encoded = try NSKeyedArchiver.archivedData(withRootObject: anchor, requiringSecureCoding: false)
        defaults.setValue(encoded, forKey: AnchorKey)
        defaults.synchronize()
    } catch {
        return
    }
}

检查此项：。我认为要使其工作，您需要扩展HKQueryAnchor以符合可解码