xcode - Int 到 String Swift

Question

我制作了一个计数器，并设法保存和加载该数据。问题是“var counter = 0”，所以当我向上按计数器(+1)而不是转到下一个数字时，它会返回到 0，因为变量设置为 0。这是我的代码

class ReminderClass: NSViewController {


@IBOutlet var Count: NSTextField!

  override func viewDidLoad() {
    readStats()
    super.viewDidLoad()

}

func readStats() -> (NSString?){
    let location = NSString(string:"location to my file").stringByExpandingTildeInPath
    let fileContent = try? NSString(contentsOfFile: location, encoding: NSUTF8StringEncoding)
    print(fileContent)
    Count.stringValue = (fileContent?.stringByExpandingTildeInPath)!
    fileContent?.stringByReplacingOccurrencesOfString(Count.stringValue, withString: Count.stringValue)
    return fileContent
}

var counter = 0 //thats the problem
var counterfind = ""

@IBAction func PlusOne(sender: AnyObject) {
    counter = counter + 1
    Count.stringValue = NSString(format: "%i", counter) as String
}

@IBAction func MinusOne(sender: AnyObject) {
    counter = counter - 1
    Count.stringValue = NSString(format: "%i", counter) as String
}

@IBAction func save(sender: AnyObject) {
    print(Count.stringValue)
    let data = NSString(string:Count.stringValue)
    let destPath = "path to my file"
    _ = NSFileManager.defaultManager()
    do {
        try data.writeToFile(destPath, atomically: true, encoding: NSUTF8StringEncoding)
    } catch let error as NSError {
        print("Error: \(error)")
    }

    print(counter)
    self.view.window?.close()

}

Answer 1

感谢大家帮助我解决我的第一个 Mac 应用程序遇到的小问题。我设法找出问题所在。现在这是我的代码:

class ReminderClass: NSViewController {




@IBOutlet var Count: NSTextField!

  override func viewDidLoad() {
    readStats()
    super.viewDidLoad()

}



func readStats() -> (NSString?){
    let location = NSString(string:"path-to-file").stringByExpandingTildeInPath
    let fileContent = try? NSString(contentsOfFile: location, encoding: NSUTF8StringEncoding)
    print(fileContent)
    Count.stringValue = (fileContent?.stringByExpandingTildeInPath)!
    fileContent?.stringByReplacingOccurrencesOfString(Count.stringValue, withString: Count.stringValue)
    return fileContent
}



    @IBAction func PlusOne(sender: AnyObject) {
    let counter : String = Count.stringValue
    var num : Int? = Int(counter)
    num = num! + 1
    Count.stringValue = NSString(format: "%i", num!) as String
    }

@IBAction func MinusOne(sender: AnyObject) {
    let counter : String = Count.stringValue
    var num : Int? = Int(counter)
    num = num! - 1
    Count.stringValue = NSString(format: "%i", num!) as String
    }


@IBAction func save(sender: AnyObject) {
    print(Count.stringValue)
    let data = NSString(string:Count.stringValue)
    let destPath = "path-to-file"
    _ = NSFileManager.defaultManager()
    do {
        try data.writeToFile(destPath, atomically: true, encoding: NSUTF8StringEncoding)
    } catch let error as NSError {
        print("Error: \(error)")
    }

    self.view.window?.close()

}

再次感谢大家! :)