Question

我正在创建一个位置应用，我将我的位置存储在FireBase中，我在函数中获取当前坐标。但是如何将这些坐标发送到另一个在线存储它的函数。

这是我的代码：

var latPass: Double!
var longPass: Double!

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{
    var location=locations[0]
    let span:MKCoordinateSpan=MKCoordinateSpanMake(0.01, 0.01)
    var myLocation:CLLocationCoordinate2D=CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)
    let region:MKCoordinateRegion=MKCoordinateRegionMake(myLocation, span)
    latPass=location.coordinate.latitude
    longPass=location.coordinate.longitude

}

func post(){

    let lat=latPass
    let long=longPass

    let post : [String: Double]=["lat":lat, "long":long]
    let dataBaseRef=FIRDatabase.database().reference()
    dataBaseRef.child("Location").childByAutoId().setValue(post)

}

我的 latPass ＆amp; longPass 是我要传递给post()

的坐标

我该怎么办？救命啊！

Answer 1

您已经在班级中全局声明了它们，因此您可以像现在一样在任何地方访问它们。无需创建其他变量。

func post() {
    let post : [String: Double]=["lat":latPass, "long":longPass]
    let dataBaseRef=FIRDatabase.database().reference()
    dataBaseRef.child("Location").childByAutoId().setValue(post)
}

否则你可以在post函数中设置参数：

func post(lat: Double, long: Double) {
    let post : [String: Double]=["lat":lat, "long":long]
    let dataBaseRef=FIRDatabase.database().reference()
    dataBaseRef.child("Location").childByAutoId().setValue(post)
}

立即致电：

post(lat: 11.000, long: 12.000)

<强>更新
将您的locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])更新为：

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    // if you pass this guard, then you have a valid loction
    guard let latitude = manager.location?.coordinate.latitude, let longitude = manager.location?.coordinate.longitude else { return }
    let span:MKCoordinateSpan=MKCoordinateSpanMake(0.01, 0.01)
    let myLocation:CLLocationCoordinate2D=CLLocationCoordinate2DMake(latitude, longitude)
    let region:MKCoordinateRegion=MKCoordinateRegionMake(myLocation, span)
    latPass = latitude
    longPass = longitude
    // Call post here because now you have valid a location
    post()
}

如何将值从一个函数传递到另一个函数？

1 个答案: