將消息發送給多個收件人時，Swift /核心數據獲取到數組

Question

我正在嘗試從核心數據中獲取電話號碼，並將短信發送給多個收件人。

用for循環獲取數字，但是我不能在for循環之外使用它。 （我可以將它們寫入控制台，但不能寫入“ messageVC.recipients = tela;”。

錯誤是“使用無法解析的標識符”，我正在使用Xcode6

這是我的代碼；

@IBAction func sendMessages(sender: AnyObject) {

    let entityDescription =
    NSEntityDescription.entityForName("Person",
        inManagedObjectContext: managedObjectContext!)

    let request = NSFetchRequest()
    request.entity = entityDescription

    var error: NSError?

    var objects = managedObjectContext?.executeFetchRequest(request,
        error: &error)

    if let results = objects {

        if results.count > 0 {
            var saydir = results.count - 1
            for (var i=0; i < results.count; i++) {
                let match = results[i] as NSManagedObject
                var tela = match.valueForKey("number") as String
                println(tela)
            }

        } else {

        }

    }

    var messageVC = MFMessageComposeViewController()
    messageVC.recipients = tela;
    messageVC.body = "text1" + "text2";
    messageVC.messageComposeDelegate = self;

    self.presentViewController(messageVC, animated: false, completion: nil)
}

Answer 1

var tela = match.valueForKey("number") as String的var tela = match.valueForKey("number") as String范圍在for循環內（即，在for循環外無法訪問）。

您要么必須：

• 在外部創建var（將其放置在與使用它相同的范圍內）；
• 在您擁有的實際tela變量旁邊執行操作。

編輯1：

代碼可能是這樣的（未經測試）：

@IBAction func sendMessages(sender: AnyObject) {

    let entityDescription =
    NSEntityDescription.entityForName("Person",
        inManagedObjectContext: managedObjectContext!)

    let request = NSFetchRequest()
    request.entity = entityDescription

    var error: NSError?

    var recipients = [String]()

    if let results = managedObjectContext?.executeFetchRequest(request,
        error: &error) {

        if results.count > 0 {
            var saydir = results.count - 1
            for (var i=0; i < results.count; i++) {
                let match = results[i] as NSManagedObject
                var tela = match.valueForKey("number") as String
                println(tela)

                recipients.append(tela)
            }

        } else {

        }

    }

    var messageVC = MFMessageComposeViewController()
    messageVC.recipients = recipients;
    messageVC.body = "text1" + "text2";
    messageVC.messageComposeDelegate = self;

    self.presentViewController(messageVC, animated: false, completion: nil)
}