SWIFT COREDATA-使用“循环”遍历结果；在「；循环以构建单独的数组

SWIFT岩心数据 我在设置for-in循环以从获取中收集结果时遇到问题。通过fetch results[index]获取单个结果没有问题，但在循环中插入for会导致错误（类型不匹配）或（类型在生成器中不包含成员）。我想使用提取结果填充一个单独的数组

非常感谢您提供的任何帮助

代码节选：

import Foundation
import UIKit
import CoreData
// globaals
var pickResult:String?
var pickMultiresult:[AnyObject]?
// add var
var fullnameMulti:[String]?  // array of full names
var i:Int = 0
// end new var
class ClientPicker:UIViewController, UIPickerViewDelegate {
    // connections

    @IBOutlet weak var singleResult: UITextField!
    let managedObjectContext = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
    @IBOutlet weak var firstname: UITextField!
    @IBOutlet weak var status: UILabel!
    var lastname:String = ""
    var phone:String = ""
    var email:String = ""

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
 }
 // MARK: ********** block 2 --- findClient ****
    @IBAction func findClient(sender: AnyObject) {
        let entityDescription = NSEntityDescription.entityForName("Contacts", inManagedObjectContext: managedObjectContext)
        let request = NSFetchRequest()
        request.entity = entityDescription
        let pred = NSPredicate(format: "(firstname = %@)", firstname.text!)
        request.predicate = pred

        do {
            var results = try managedObjectContext.executeFetchRequest(request)
            multiresult = results
            if results.count > 0 {
//                let match = results[0] as! NSManagedObject  NOTE: these return correct data for indices 0 and 3
//                let match = results[3] as! NSManagedObject  NOTE: these return correct data for indices 0 and 3 
                status.text = "There are  \(results.count) people named \(firstname.text!)"
            } else {
                status.text = "No Match"
            }
        } catch let error as NSError {
            status.text = error.localizedFailureReason
        }



// for in loop to populate firstnameMulti array
        i = 0
    for i in results{
        var p = i
        let match = results[p] as! NSManagedObject

                /* the following code returns correct fullname when used outside of for loop
                but error when I use the for loop  */
                firstname.text = match.valueForKey("firstname") as? String
                /*****************  concatenate first and last names  ********/
                let first = match.valueForKey("firstname") as? String
                let last = match.valueForKey("lastname") as? String
                // concatenate
                var fullname:String = ""
                fullname = "\(first!) \(last!)"
                singleResult.text = fullname       
        }
}

*/  error: value of type string has no member in Generator */

---

在循环中填充文本字段的文本，并在每次迭代时覆盖它。这没有任何意义

要生成全名数组，请获取对象并强制转换到适当的NSManagedObject子类，例如

Person

，这样您就可以得到

[Person]

数组，然后只需使用

map

：

let nameList = results.map { "\($0.firstname) \($0.lastname)" }

---

这里有几个问题，但我将集中讨论你所问的那些问题

首先，您将

i

声明为

Int

，然后尝试在

for in

循环中使用它。这将失败

其次，您应该在获取过程中处理类型转换：

var results = try managedObjectContext.executeFetchRequest(request) as! [NSManagedObject]

现在您有了一个类型为

NSManagedObject

的集合，您的

for in

变得更干净了：

for match in results {

---

谢谢，我更改了这两条语句，去掉了无关的变量，但现在又出现了另一个错误。你能告诉我一个从fetch构建数组的示例代码吗？我在回答中显示的第一行代码提供了你需要的数组。你犯了什么错误？给出含糊的评论没有价值，也不能让任何人给你提供帮助。如果你要投票否决我，至少留下一条评论，为什么你认为我的答案是错误的。