Question

搜索了很多这个问题，但是找不到简单的答案。

我希望能够从Firebase数据库读取位置数据，并将其作为注释显示在MapKit上。

你能帮忙吗？

现在，我可以显示经过硬编码但无法弄清楚如何读取数据库的注释，然后创建一个循环，以在地图上显示所有注释。

这是显示注释的代码。我想用Firebase中的相关数据填充标题，纬度，经度。 Firebase数据库如下：Firebase Database

**该应用程序已与Firebase连接！

let points = [
        ["title": ,    "latitude": , "longitude": ],    
    ]
    for point in points {
        let annotation = MKPointAnnotation()
        annotation.title = point["title"] as? String
        annotation.coordinate = CLLocationCoordinate2D(latitude: point["latitude"] as! Double, longitude: point["longitude"] as! Double)
        mapView.addAnnotation(annotation)
    }

在提出建议后，我编辑了代码，现在就像这样：

let ref = Database.database().reference()
    ref.child("x-database-alpha/name").observe(.childAdded, with: { (snapshot) in

        let title = (snapshot.value as AnyObject?)!["Title"] as! String?
        let latitude = (snapshot.value as AnyObject?)!["Latitude"] as! String?
        let longitude = (snapshot.value as AnyObject?)!["Longitude"] as! String?

        let annotation = MKPointAnnotation()
        annotation.coordinate = CLLocationCoordinate2D(latitude: (Double(latitude!))!, longitude: (Double(longitude!))!)
        annotation.title = title
        self.mapView.addAnnotation(annotation)
    })

检查Exact Firebase Database

现在代码没有错误，但是没有注释！

Answer 1

示例代码：

let ref = Database.database().reference()
ref.child("name").observe(.childAdded, with: { (snapshot) in

let title = (snapshot.value as AnyObject!)!["Title"] as! String!
let latitude = (snapshot.value as AnyObject!)!["Latitude"] as! String!
let longitude = (snapshot.value as AnyObject!)!["Longitude"] as! String!

let annotation = MKPointAnnotation()
annotation.coordinate = CLLocationCoordinate2D(latitude: (Double(latitude!))!, longitude: (Double(longitude!))!)
annotation.title = title
self.map.addAnnotation(annotation)
})

尝试显示位置数据从Firebase到MapKit

1 个答案: