Swift / 向多个收件人发送消息时将核心数据提取到数组

Question

我正在尝试从核心数据中获取 phone 号码并向多个收件人发送短信。

正在使用 for 循环获取数字，但我不能在 for 循环之外使用它。（我可以将它们写入控制台但不能写入 "messageVC.recipients = tela;"

错误是 "Use of unresolved identifier" 我正在使用 Xcode6

这是我的代码；

@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

您的 var tela = match.valueForKey("number") as String 范围在您的 for 循环内（即在您的 for 循环之外不可访问）。

您要么必须：

在外部创建您的 var（将其放置在您将使用它的同一范围内）；
在您拥有的实际 tela 变量旁边执行操作。

编辑 1 :

代码可能是这样的（未测试）：

@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)
}

Swift / 向多个收件人发送消息时将核心数据提取到数组

Swift / core data fetching to array when sending message to multiple recipients

xcode

core-data

ios

swift