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大家好，我有一个日期选择器计算应用程序，我想知道为什么所选日期没有打印到我的文本标签上。这是我的代码

@IBAction func calculateDays(sender: UIButton) {

    if startDateTextField.text == "" || endDateTextField == "" {

        let alert2 = UIAlertController(title: "Oops!", message: "Please Select a Start Date!", preferredStyle: UIAlertControllerStyle.Alert)
        alert2.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Default, handler: nil))
        self.presentViewController(alert2, animated: true, completion: nil)


    }
    else {

        let start = String(startDateTextField.text)
        let end = String(endDateTextField.text)
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = "MM-dd-yyyy"


        guard let startDate = dateFormatter.dateFromString(start), endDate = dateFormatter.dateFromString(end) else {
            // You don't have dates, show error(print("error"), do no nothing - your choice.
            return
        }



        let calendar = NSCalendar.currentCalendar()
        let components = calendar.components([.Day], fromDate: startDate, toDate: endDate, options: [])
        let secondNewString = "\(components.day) days"
        resultNumberOfDays.text = secondNewString

    }

}

如果我强制展开作为测试，它可以使用（显然这不安全）

 let startDate:NSDate = dateFormatter.dateFromString(start)!
 let endDate:NSDate = dateFormatter.dateFromString(end)!

关于如何让计算出的日期出现或让我知道我在这里缺少什么的任何想法

谢谢

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