Ios 如何使用自定义名称保存和加载.txt文件？

我在一个应用程序中有一个弹出文本框警报，用户可以输入字符为.txt文件创建自定义名称，然后保存该文件。此文件名存储在名为rideContent的全局变量中。调用saveRide（）函数时，一个包含字符串信息的文件存储在.txt中，应该使用用户在文本框中创建的文件名，但是存储在数组中的文件名为空

我在stopAction函数中调用save函数的顺序是否错误，或者调用得太早，这就是数组为空的原因？还是我以错误的方式调用rideName=rideContent？i、 e.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。任何帮助都将不胜感激

这里我调用一个名为rideContent的全局变量：

var rideContent = [String]()

@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()
}

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 _ {

    }
}

这里我调用save函数：

var rideContent = [String]()

@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()
}

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 _ {

    }
}

以下是保存到文本文件的代码：

var rideContent = [String]()

@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()
}

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 _ {

    }
}

是用户可以输入自定义名称的屏幕截图。根据用户输入的骑乘名称，骑乘名称是否应在打印检查中称为“上午骑乘”

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这是在我的打印检查语句[]中打印到控制台的内容：保存的骑乘的名称

您的“saveRide（）”函数将立即被调用。将其放在块内，以便在您的saveAction中调用。

干杯！它让我称之为self.self.saveRide（）。给赛尔夫打两次电话常见吗？我以前从未见过。。。