iphone - 需要归档CLLocation数据

Question

我有一组想要存档的 CLLocation 数据。是否应该使用 NSUserDefaults 系统？否则，如何最好地归档 CLLocation 数据？

Answer 1

要正确存储 CLLocation 而不会丢失信息，请使用 NSKeyedArchiver，如下所示:

CLLocation *myLocationToStore = ...; // (a CLLocation object)
NSData *locationData = [NSKeyedArchiver archivedDataWithRootObject:myLocationToStore];

然后可以将其存档到 NSUserDefaults，并在使用 NSKeyedUnarchiver 检索它时同样简单地进行解码:

CLLocation *myStoredLocation = (CLLocation *)[NSKeyedUnarchiver unarchiveObjectWithData:locationData];

Swift equivalent functions是:

class func archivedDataWithRootObject(_ rootObject: AnyObject) -> NSData]
class func unarchiveObjectWithData(_ data: NSData) -> AnyObject?