如何使用自定义名称保存和加载.txt文件?

时间:2016-02-23 19:12:15

标签: ios arrays swift textbox text-files

我在应用程序中有一个弹出文本框警报,用户可以在其中输入字符以创建.txt文件的自定义名称,然后保存文件。此文件名存储在名为rideContent的全局变量中。当我调用saveRide()函数时,一个充满字符串信息的文件存储在.txt中,应该使用文件框中用户创建的文件名,但是存储在其中的文件的名称数组是空的。

我是否在stopAction函数中调用了save函数或者太快了,这就是数组为空的原因?或者我是以错误的方式调用rideName = rideContent?即rideName = rideContent [-1]?

我希望用户输入自定义名称,并将其用作保存和加载文件的标识符。任何帮助将不胜感激!

这里我调用一个名为rideContent的全局变量:

var rideContent = [String]()

我在这里调用保存功能:

@IBAction func stopAction(sender: UIButton) {
    let alert = UIAlertController(title: "Ride Stopped", message: "Give a title to your ride", preferredStyle: .Alert)

    let saveAction = UIAlertAction(title: "Save", style: .Default,
        handler: { (action:UIAlertAction) -> Void in

            // Allow for text to be added and appended into the RideTableViewController
            let textField = alert.textFields!.first
            rideContent.append(textField!.text!)
            // Update permanent storage after deleting a ride
            NSUserDefaults.standardUserDefaults().setObject(rideContent, forKey: "rideContent")

            // Segue to the Ride details page
            self.performSegueWithIdentifier("ShowRideDetail", sender: nil)
    })

    let cancelAction = UIAlertAction(title: "Cancel",
        style: .Default) { (action: UIAlertAction) -> Void in
    }

    alert.addTextFieldWithConfigurationHandler {
        (textField: UITextField) -> Void in
    }

    alert.addAction(saveAction)
    alert.addAction(cancelAction)



    //Show the alert
    presentViewController(alert, animated: true, completion: nil)


    // Stop the timer
    timer.invalidate()

    // Stop location updates
    self.stopLocation()

    // Save the ride
    saveRide()
}

以下是保存到文本文件的代码:

func saveRide() { 
    let rideName = rideContent
    // Print Check
    print("\(rideName) : the name of the saved ride")

    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
    let documentsDirectory = paths[0]
    let fileName = ("\(documentsDirectory)")+("\(rideName)")+(".txt")
    print("\(fileName)This is firt check")
    var content: String

    // Adding elasped time information to the bicycle ride
    // Content Order: Seconds, Minutes, Hours, Distance \n coordinates
    content = ("\(seconds) Seconds, ")+("\(minutes) Minutes, ")+("\(hours) Hours, ") + ("\(self.distanceLabel.text!)") + "\n"

    // Create a for loop to add each recorded coordinate value to the content list to later be added and displayed as a polyline
    for coord in self.coords {

        content = content + ("\(coord.latitude) " + "," + "\(coord.longitude) " + "\n")

    }
    do{
        try content.writeToFile(fileName, atomically: false, encoding: NSUTF8StringEncoding)
    }catch _ {

    }
}

Here是用户可以输入自定义名称的屏幕截图。根据用户输入的乘车名称,不应该调用乘车名称" Morning Ride"在打印检查?

这是在我的打印检查语句中打印到控制台的内容, []:已保存骑行的名称

1 个答案:

答案 0 :(得分:0)

你的" saveRide()"正在立即调用函数。将它放在块中,以便在saveAction上调用它。