如何使用ios parse.com将坐标保存为PFGeopoint

我想添加使用textfield的用户提供的经度和纬度，以及要在PFGeoPoint中传递的值。但是textfield值在字符串中，与PFGeoPoint无关。我的代码是：

@IBOutlet weak var latitue_filed: UITextField!
@IBOutlet weak var longitudead: UITextField!

   let lati :  = (latitue_filed.text as? PFGeoPoint)!
   let lon :  = (longitudead.text as? PFGeoPoint)!

  let myGeoPoint = PFGeoPoint(latitude: lat, longitude: lon)
    posts["location"] = myGeoPoint
    posts.saveInBackgroundWithBlock {
        (success: Bool, error: NSError?) -> Void in
        if (success) {
            // The object has been saved.
        } else {
            // There was a problem, check error.description
        }
    }
    posts.saveInBackground()` 

这里是latitue_字段，longitudead是textfield。如何在PFGeoPoint中传递文本字段值。

根据，

PFGeoPoint

实际上是一个

PFObject

，它使用双倍的

纬度

和

经度

（即度）并将它们嵌入在一起。您当前正在将字符串值从textfield强制转换为单个

PFGeoPoints

。将字符串值强制转换为双倍，并使用文档中描述的方法创建

PFGeoPoint

let lati = Double(latitue_filed.text)
let lon = Double(longitudead.text)

let myGeoPoint = PFGeoPoint(latitude: lat, longitude: lon)
posts["location"] = myGeoPoint
posts.saveInBackgroundWithBlock {
    (success: Bool, error: NSError?) -> Void in
    if (success) {
        // The object has been saved.
    } else {
        // There was a problem, check error.description
    }
}