ios - 如何使用核心数据将此代码更改为 swift 2？

Question

我正在尝试遵循这个示例，但我意识到它不在 swift 2 中。我是 swift 的新手，所以我不知道如何将它更改为不同的东西。有人可以帮忙吗？

import UIKit
import CoreData

class ViewController: UIViewController {

    @IBOutlet weak var firstName: UITextField!
    @IBOutlet weak var lastName: UITextField!
    @IBOutlet weak var timeLabel: UITextField!
    @IBOutlet weak var costLabel: UITextField!
    @IBOutlet weak var commentLabel: UITextField!

    let maContext = (UIApplication.sharedApplication().delegate as AppDelegate).managedObjectContext

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    @IBAction func saveClient(sender: AnyObject) {
        let personDescription = NSEntityDescription.entityForName("Person", inManagedObjectContext: maContext)
    }

    // let person = Person(entity: personDescription!, insertIntoManagedObjectContext: maContext)

    person.fName = firstName.text
    person.lName = lastName.text
    person.time = timeLabel.int
    person.cost = costLabel.int
    person.comments = commentLabel.text

    var error:NSError?

    maContext?.save(&error)

    if let err = error
    {
        let a  = UIAlertView(title: "Error", message: err.localizedFailureReason, delegate: nil, cancelButtonTitle: "OK")
        a.show()
    }
    else{
        let a = UIAlertView(title: "Success", message: "Your Record is saved" , delegate: nil, cancelButtonTitle: "OK")

        a.show()
    }
}

Answer 1

抱歉，我没有足够的声誉来发表评论，所以我会尽力回答您的问题。

该代码似乎符合 Swift 2。我不认为 CoreData API 已升级为利用新的 do/try/catch 错误处理语法，因此 &error 保存为 NSManagedObjectContext 似乎没问题。