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我是 Xcode 的新手，我从来没有用 swift 为 iphone 创建过应用程序，所以我仍然有很多麻烦。

在我的应用程序中，我想打开地图页面，并希望为我拥有的每个地址显示一个图钉。为此，我创建了一个带有一些位置的 json。到目前为止，我只能访问这个本地文件并用它生成一个打印件。但是，当我尝试调用该函数在地图上创建图钉时，会出现错误。

import UIKit
import MapKit

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

@IBOutlet weak var mapa: MKMapView!
var gerenciadorLocalizacao = CLLocationManager()


override func viewDidLoad() {
    super.viewDidLoad()
    configurarGerenciadorLocalizacao()


    guard let path = Bundle.main.path(forResource: "testeJSON", ofType: "json") else {return}
    let url = URL(fileURLWithPath: path)
    do {
        let data = try Data(contentsOf: url)
        let json = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as! NSArray
        print(json)
        guard let array = json as? [Any] else {return}
        for user in array {

            guard let userDict = user as? [String: Any] else {return}
            guard let userId = userDict["id"] as? String else {return}
            guard let name = userDict["nome"] as? String else {return}
            guard let lat = userDict["latitude"] as? String else {return}
            guard let lon = userDict["longitude"] as? String else {return}
            guard let note = userDict["nota"] as? String else {return}

            exibirLocalMapa(latitude: Double(lat)!, longitude: Double(lon)!, titulo: name, nota: note)

            print(userId)
            print(name)
            print(lat)
            print(lon)
            print(note)
            print(" ")  

        }
    }catch {
        print(error)
    }
}


func exibirLocalMapa(latitude: Double, longitude: Double, titulo: String, nota: String) {
    let latitude: CLLocationDegrees = latitude
    let longitude: CLLocationDegrees = longitude

    let deltaLatitude: CLLocationDegrees = 0.01
    let deltaLongitude: CLLocationDegrees = 0.01

    let localizacao: CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)
    let areaVisualizacao: MKCoordinateSpan = MKCoordinateSpanMake(deltaLatitude, deltaLongitude)

    let regiao: MKCoordinateRegion = MKCoordinateRegionMake(localizacao, areaVisualizacao)

    self.mapa.setRegion(regiao, animated: true)


    let anotacao = MKPointAnnotation()
    //Configurar a anotação
    anotacao.coordinate = localizacao
    anotacao.title = titulo
    anotacao.subtitle = nota
    self.mapa.addAnnotation(anotacao)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func configurarGerenciadorLocalizacao(){
    gerenciadorLocalizacao.delegate = self
    gerenciadorLocalizacao.desiredAccuracy = kCLLocationAccuracyBest
    gerenciadorLocalizacao.requestWhenInUseAuthorization()
    gerenciadorLocalizacao.startUpdatingLocation()
}

func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
    if status != .authorizedWhenInUse {
        let alertaController = UIAlertController(title: "Permissão de Localização", message: "Necessário permissão para acesso à sua localização. Favor habilitar esta funcionalidade", preferredStyle: .alert)
        let acaoConfiguracoes = UIAlertAction(title: "Abrir Configurações", style: .default, handler: {(alertaConfiguracoes) in
            if let configuracoes = NSURL(string: UIApplicationOpenSettingsURLString) {
                UIApplication.shared.open(configuracoes as URL)
            }
        })
        let acaoCancelar = UIAlertAction(title: "Cancelar", style: .default, handler: nil)
        alertaController.addAction(acaoConfiguracoes)
        alertaController.addAction(acaoCancelar)
        present(alertaController, animated: true, completion: nil)
    }
}
}
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2 回答 2

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也许您可以尝试创建自己的扩展 MKPointAnnotation 的类，然后将 JSON 的元素映射到该自定义类的数组中，最后调用 mapView.addAnnotations(yourAnnotationsArrayHere)。

试试这个例子： https ://www.raywenderlich.com/160517/mapkit-tutorial-getting-started

我推荐你从这个网站开始 iOS 开发。

于 2018-06-25T11:57:53.897 回答
0

请按照以下步骤删除地图上的所有图钉：

  1. 您必须使用for 循环从 JSON 文件中获取所有详细信息并将其存储在数组中。

  2. 调用函数，该函数将使用存储数组中的纬度、经度、地点名称和注释在地图上标记注释。

快乐编码！

于 2018-06-24T16:33:25.187 回答