如何保存[GMSPolyline]这样，当用户关闭并打开它仍然保留在我的当前项目的数据

Question

你好的应用程序我有：

class SecondController: UIViewController, CLLocationManagerDelegate { 

var allPoly : [GMSPolyline] = [] 
private let rootKey = "rootKey" 

func applicationWillResignActive(notification: NSNotification) 
    { 
     let filePath = self.dataFilePath() 
     let savedPolys = SavedPolys() 
     let array = self.allPoly as NSArray 
     savedPolys.alPoly = array as? [GMSPolyline] 
     let data = NSMutableData() 
     let archiver = NSKeyedArchiver(forWritingWith: data) 
     archiver.encode(savedPolys, forKey: rootKey) 
     archiver.finishEncoding() 
     data.write(toFile: filePath, atomically: true) 
    } 

    func dataFilePath() -> String 
    { 
     let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true) 
     let documentsDirectory = paths[0] as NSString 
     return documentsDirectory.appendingPathComponent("data.archive") as String 
    } 

    func buttonPressed() 
    { 
     //adds a polyline to allPoly! 
    } 

    } 

除了其他类：

import Foundation 
import GoogleMaps 

class SavedPolys: NSObject, NSCoding, NSCopying 
{ 
    var alPoly: [GMSPolyline]? 
    let polyKey = "polyKey" 

    override init() 
    { 

    } 

    required init?(coder aDecoder: NSCoder) 
    { 
     alPoly = aDecoder.decodeObject(forKey: polyKey) as? [GMSPolyline] 
    } 

    func encode(with aCoder: NSCoder) { 
     if let savePoly = alPoly 
     { 
      aCoder.encode(savePoly, forKey: polyKey) 
     } 
    } 

    func copy(with zone: NSZone? = nil) -> Any { 
     let copy = SavedPolys() 
     if let polysToCopy = alPoly 
     { 
      var newPolys = Array<GMSPolyline>() 
      for poly in polysToCopy 
      { 
       newPolys.append(poly) 
      } 
      copy.alPoly = newPolys 
     } 
     return copy 
    } 
} 

我想让它如此，如果用户将polys添加到allPoly数组中，然后关闭它们的应用程序，数组将被保存，然后在它们打开应用程序时重新加载。我已经尝试过从我班的教科书（这是所有这些内容的来源）出来的一章，但是这个当前的代码给了我一个这样的错误：“archiver.encode（savedPolys，forKey：rootKey）”。它说“无法识别的选择器发送到实例”。谁能帮我？有一种更简单的方法吗？谢谢！

Answer 1

您正在复制的代码有点旧，API发生了变化，这就是为什么它会抛出错误。下面是修改后的代码：

雨燕2.3

class SavedPolys : NSObject, NSCoding, NSCopying 
{ 
    var alPoly: [GMSPolyline]? 
    let polyKey = "polyKey" 

    override init() 
    { 

    } 

    required init?(coder aDecoder: NSCoder) 
    { 
    alPoly = aDecoder.decodeObjectForKey(polyKey) as? [GMSPolyline] 
    } 

    func encodeWithCoder(aCoder: NSCoder) 
    { 
    if let savePoly = alPoly 
    { 
     aCoder.encodeObject(savePoly, forKey: polyKey) 
    } 
    } 

    func copyWithZone(zone: NSZone) -> AnyObject 
    { 
    let copy = SavedPolys() 
    if let polysToCopy = alPoly 
    { 
     var newPolys = Array<GMSPolyline>() 
     for poly in polysToCopy 
     { 
     newPolys.append(poly) 
     } 
     copy.alPoly = newPolys 
    } 
    return copy 
    } 
} 


@UIApplicationMain 
class AppDelegate: UIResponder, UIApplicationDelegate { 

    var window: UIWindow? 

    var allPoly : [GMSPolyline] = [] 
    private let rootKey = "rootKey" 

    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { 
    // Override point for customization after application launch. 

    let filePath = self.dataFilePath() 
    let savedPolys = SavedPolys() 
    let array = self.allPoly as NSArray 
    savedPolys.alPoly = array as? [GMSPolyline] 
    let data = NSMutableData() 
    let archiver = NSKeyedArchiver(forWritingWithMutableData: data) 
    archiver.encodeObject(savedPolys, forKey: rootKey) 
    archiver.finishEncoding() 
    data.writeToURL(NSURL(fileURLWithPath: filePath), atomically: true) 


    return true 
    } 

    func dataFilePath() -> String 
    { 
    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) 
    let documentsDirectory = paths[0] as NSString 
    return documentsDirectory.stringByAppendingPathComponent("data.archive") 
    } 
} 

雨燕3.0

class SavedPolys : NSObject, NSCoding, NSCopying 
{ 
    var alPoly: [GMSPolyline]? 
    let polyKey = "polyKey" 

    override init() 
    { 

    } 

    required init?(coder aDecoder: NSCoder) 
    { 
    alPoly = aDecoder.decodeObject(forKey: polyKey) as? [GMSPolyline] 
    } 

    func encode(with aCoder: NSCoder) 
    { 
    if let savePoly = alPoly 
    { 
     aCoder.encode(savePoly, forKey: polyKey) 
    } 
    } 

    func copy(with zone: NSZone? = nil) -> Any 
    { 
    let copy = SavedPolys() 
    if let polysToCopy = alPoly 
    { 
     var newPolys = Array<GMSPolyline>() 
     for poly in polysToCopy 
     { 
     newPolys.append(poly) 
     } 
     copy.alPoly = newPolys 
    } 
    return copy 
    } 
} 

@UIApplicationMain 
class AppDelegate: UIResponder, UIApplicationDelegate { 

    var window: UIWindow? 
    var allPoly : [GMSPolyline] = [] 
    private let rootKey = "rootKey" 

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { 
    // Override point for customization after application launch. 
    let filePath = self.dataFilePath() 
    let savedPolys = SavedPolys() 
    let array = self.allPoly as NSArray 
    savedPolys.alPoly = array as? [GMSPolyline] 
    let data = NSMutableData() 
    let archiver = NSKeyedArchiver(forWritingWith: data) 
    archiver.encode(savedPolys, forKey: rootKey) 
    archiver.finishEncoding() 
    data.write(to: NSURL(fileURLWithPath: filePath) as URL, atomically: true) 

    return true 
    } 

    func dataFilePath() -> String 
    { 
    let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true) 
    let documentsDirectory = paths[0] as NSString 
    return documentsDirectory.appendingPathComponent("data.archive") 
    } 
}