自 iOS 12.0 起，如何使用 UserDefaults 存档和取消存档 SKPhysicsBody 数组-解网

问：

我可以使用 UserDefaults 成功存档和取消存档 SKPhysicsBody 数组，如下所示，但取消存档过程已被弃用。这是警告消息... 'unarchiveObject（with：）' 在 iOS 12.0 中已弃用：请改用 +unarchivedObjectOfClass：fromData：error：。我一直在兜兜转转，但仍然没有工作。我将如何遵守这一点？我的代码如下。

要存档...

do { try UserDefaults.standard.set(NSKeyedArchiver.archivedData(withRootObject:Sat1shapes,requiringSecureCoding:true), forKey: "Sat1shapes")
 }
catch { 
print(error)}

要取消存档...

var Sat1shapes: [SKPhysicsBody] = []
                
if let dataObject = UserDefaults.standard.value(forKey: "Sat1shapes") as? NSData {
                    Sat1shapes = NSKeyedUnarchiver.unarchiveObject(with: dataObject as Data) as! [SKPhysicsBody]
                    }

下面是避免警告的更新代码，但它不像已弃用的版本那样存储 [SKPhysicsBody] 数组。

var Sat1shapes: [SKPhysicsBody] = []
        
         let dataObject = UserDefaults.standard.value(forKey: "Sat1shapes") as? NSData
        do  {
            Sat1shapes = try NSKeyedUnarchiver.unarchivedObject(ofClasses: [NSArray.self, SKPhysicsBody.self], from: dataObject! as Data) as! [SKPhysicsBody]
            
            } catch {
                print(error)
            }

数组 swift skphysicsbody userdefaults nskeyedunarchiver

func writeBody(_ body: SKPhysicsBody) {
    do {
        // Convert from SKPhysicsBody to Data
        let data = try NSKeyedArchiver.archivedData(withRootObject: body, requiringSecureCoding: false)
        // Write Data instance into UserDefaults
        UserDefaults.standard.set(data, forKey: "body")
        print("Wrote body: \(String(reflecting: body))")
    } catch {
        print("Failed to write body: \(error.localizedDescription)")
    }
}

func readBody() -> SKPhysicsBody? {
    // Read body from UserDefaults (as Data).
    guard let dataObject = UserDefaults.standard.object(forKey: "body") else {
        print(#"No data was stored in UserDefaults under "body" key"#)
        return nil
    }
    
    guard let data = dataObject as? Data else {
        print(#"Object stored in UserDefaults "body" key is not Data type."#)
        return nil
    }
    
    do {
        return try NSKeyedUnarchiver.unarchivedObject(ofClass: SKPhysicsBody.self, from: data)
    } catch {
        print("Failed to unarchive SKPhysicsBody from Data: \(error.localizedDescription)")
        return nil
    }
}

更新：添加数组变体

func writeBodies(_ bodies: [SKPhysicsBody]) {
    do {
        // Convert from SKPhysicsBody to Data
        let data = try NSKeyedArchiver.archivedData(withRootObject: bodies, requiringSecureCoding: false)
        // Write Data instance into UserDefaults
        UserDefaults.standard.set(data, forKey: "bodies")
        print("Wrote bodies: \(String(reflecting: bodies))")
    } catch {
        print("Failed to write bodies: \(error.localizedDescription)")
    }
}

func readBodies() -> [SKPhysicsBody]? {
    // Read body from UserDefaults (as Data).
    guard let dataObject = UserDefaults.standard.object(forKey: "bodies") else {
        print(#"No data was stored in UserDefaults under "bodies" key"#)
        return nil
    }
    
    guard let data = dataObject as? Data else {
        print(#"Object stored in UserDefaults "bodies" key is not Data type."#)
        return nil
    }
    
    do {
        return try NSKeyedUnarchiver.unarchivedArrayOfObjects(ofClass: SKPhysicsBody.self, from: data)
    } catch {
        print("Failed to unarchive SKPhysicsBody from Data: \(error.localizedDescription)")
        return nil
    }
}

谢谢。这似乎适用于单个 SKPhysicsBody，但是如果我尝试保存 [SKPhysicsBody] 数组，它会抛出两个错误。静态方法“unarchivedObject（ofClass：from：）”要求“[SKPhysicsBody]”符合“NSCoding”，静态方法“unarchivedObject（ofClass：from：）”要求“[SKPhysicsBody]”继承自“NSObject”。@VaporwareWolf

0赞 Guitarman4 8/18/2022

创建类 NSArray.self 会停止错误并运行，但似乎无法正确存储。这是更新后的行...NSKeyedUnarchiver.unarchivedObject（ofClass： NSArray.self， from： dataObject as！数据）作为！[SKPhysicsBody]...有什么建议吗？@VaporwareWolf

0赞 VaporwareWolf 8/21/2022

嗨，@Guitarman4，我已经修改了上面的帖子。如果这对您有帮助，请接受答案。

0赞 Guitarman4 8/22/2022

@ VaporwareWolf ，感谢您更新代码。恐怕它仍然无法处理错误消息。“无法从数据中取消存档 SKPhysicsBody：无法读取数据，因为它的格式不正确。”有趣的是，我发现unarchiveTopLevelObjectWithData运行良好，并且不会像unarchiveObject（with：）那样抛出已弃用的减弱。这是否意味着它仍然可以使用？

上一个：[MyClass initWithCoder：]：发送到实例的无法识别的选择器 - 在 iOS16 上

下一个：使用 NSKeyedUnarchiver 解码 NSArchiver

自 iOS 12.0 起，如何使用 UserDefaults 存档和取消存档 SKPhysicsBody 数组

How to archive and unarchive an SKPhysicsBody array using UserDefaults since iOS 12.0

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