ios - 应用程序关闭后如何保存引脚注释(Swift)

Question

目前，我的应用程序固定了一个位置，该位置是像这样的商店:

func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
    // Find location of user
    var userLocation:CLLocation = locations[0] as! CLLocation
    var latitude = userLocation.coordinate.latitude
    var longitude = userLocation.coordinate.longitude
    var latDelta:CLLocationDegrees = 0.01
    var longDelta: CLLocationDegrees = 0.01
    var span: MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta)
    var location:MKUserLocation = currentLocation;
    var region: MKCoordinateRegion = MKCoordinateRegionMake(location.coordinate, span)
    var coordinate:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude);
    carInitialLocation = userLocation;
    locationsDefaults.append(carInitialLocation);
    carInitialCoordinate = coordinate;

    self.map.setRegion(region, animated: true);
}

其中locationsDefaults 是我存储引脚位置的数组。

我想使用 NSUserdefaults，但我不太确定如何做到这一点，因为它不排除非 NS 数据。 Swift 中的指南/结构将不胜感激!

Answer 1

您可以将 NSData 保存到 NSUserDefaults。因此，您所需要做的就是使用 NSKeyedArchiver 将 CLLocation 对象转换为 NSData方法archivedDataWithRootObject如下:

// saving your CLLocation object
let locationData = NSKeyedArchiver.archivedDataWithRootObject(carInitialLocation)
NSUserDefaults.standardUserDefaults().setObject(locationData, forKey: "locationData")

// loading it
if let loadedData = NSUserDefaults.standardUserDefaults().dataForKey("locationData") {
    if let loadedLocation = NSKeyedUnarchiver.unarchiveObjectWithData(loadedData) as? CLLocation {
        println(loadedLocation.coordinate.latitude)
        println(loadedLocation.coordinate.longitude)
    }
}