我正在努力挽救我游戏的高核心。我正试图通过NSUserDefaults
来实现这一点。这是我正在使用的代码:
//To save highest score
var highestScore:Int = 20
NSUserDefaults.standardUserDefaults().setObject(highestScore, forKey:"HighestScore")
NSUserDefaults.standardUserDefaults().synchronize()
//To get the saved score
var savedScore: Int = NSUserDefaults.standardUserDefaults().objectForKey("HighestScore") as Int
println(savedScore)
但是NSUserDefaults
说"预期声明"时我遇到了一个错误,我不知道如何正确地实现它。还是应该使用NSArchiver
?如果是这样的话,我该如何实现呢?
使用NSCoding。创建Swift文件"HighScore"
import Foundation
class HighScore: NSObject {
var highScore: Int = 0
func encodeWithCoder(aCoder: NSCoder!) {
aCoder.encodeInteger(highScore, forKey: "highScore")
}
init(coder aDecoder: NSCoder!) {
highScore = aDecoder.decodeIntegerForKey("highScore")
}
override init() {
}
}
class SaveHighScore:NSObject {
var documentDirectories:NSArray = []
var documentDirectory:String = ""
var path:String = ""
func ArchiveHighScore(#highScore: HighScore) {
documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
documentDirectory = documentDirectories.objectAtIndex(0) as String
path = documentDirectory.stringByAppendingPathComponent("highScore.archive")
if NSKeyedArchiver.archiveRootObject(highScore, toFile: path) {
println("Success writing to file!")
} else {
println("Unable to write to file!")
}
}
func RetrieveHighScore() -> NSObject {
var dataToRetrieve = HighScore()
documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
documentDirectory = documentDirectories.objectAtIndex(0) as String
path = documentDirectory.stringByAppendingPathComponent("highScore.archive")
if let dataToRetrieve2 = NSKeyedUnarchiver.unarchiveObjectWithFile(path) as? HighScore {
dataToRetrieve = dataToRetrieve2
}
return(dataToRetrieve)
}
}
然后对于您的ViewController:
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
var Score = HighScore()
override func viewDidLoad() {
super.viewDidLoad()
Score.highScore = 100
SaveHighScore().ArchiveHighScore(highScore: Score)
var retrievedHighScore = SaveHighScore().RetrieveHighScore() as HighScore
println(retrievedHighScore.highScore)
}
}