arrays - 问题填充数组 swift 3

Question

尝试用数组填充 ViewControler，但获取的数组没有成员名称。然而，我多次设置同一个数组没有问题，但它们都在一个 tableView 中，这是一个 ViewController。

出现错误的 Controller :

class LocationViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate, LocationDelegate
{

var diveSiteArray: Array<DiveSiteSimpleModel> = [DiveSiteSimpleModel]()

override func viewWillAppear(_ animated: Bool)
{
    super.viewWillAppear(animated)

        self.diveSiteArray = AppDelegate.getDLDatabase().getDiveSitesSimple()
        loadSitesArray()

        let location = CLLocationCoordinate2D(latitude: siteLatitude,longitude: siteLongitude)
        let span = MKCoordinateSpanMake(0.15, 0.15)
        let region = MKCoordinateRegion(center: location, span: span)
        mapView.setRegion(region, animated: true)

        let annotation = MKPointAnnotation()
        annotation.coordinate = location
        annotation.title = diveSiteLabel
        mapView.addAnnotation(annotation)

    }

}
 func loadSitesArray () {

    self.diveSiteLabel = diveSiteArray.name  // here I get the error "Array< DiveSiteSimpleModel > does not have a member name
    siteLongitude = diveSiteArray.longitude  // here I get the error "Array< DiveSiteSimpleModel > does not have a member longitude
    siteLatitude = diveSiteArray.latitude   // here I get the error "Array< DiveSiteSimpleModel > does not have a member latitude
}

DiveSiteSimpleModel 如下:

struct DiveSiteSimpleModel
{
    var id: Int                     = -1
    var name: String                = ""
    var latitude: Double            = 0.0
    var longitude: Double           = 0.0
    var diveSiteImage: String       = ""

}

DLDatabase如下:

func getDiveSitesSimple(_ query: String) -> Array<DiveSiteSimpleModel>
{
    var sites: Array<DiveSiteSimpleModel> = [DiveSiteSimpleModel]()

    if self.database == nil {
        return sites
    }

    var statement: OpaquePointer? = nil

    sqlite3_prepare_v2(self.database, query, -1, &statement, nil)
    while sqlite3_step(statement) == SQLITE_ROW
    {
        var site: DiveSiteSimpleModel =  DiveSiteSimpleModel()

        site.id                 = Int(sqlite3_column_int64(statement, 0))
        site.name               = String(cString: (sqlite3_column_text(statement, 1)))
        site.latitude           = Double(sqlite3_column_double(statement, 2))
        site.longitude          = Double(sqlite3_column_double(statement, 3))
        site.diveSiteImage      = String(cString: (sqlite3_column_text(statement, 4)))

        sites.append(site)

    }

    sqlite3_finalize(statement)

    return sites
}

最后，SQL是

static let SelectDiveSiteSimple         = "SELECT * FROM DiveSite"

为此疯狂，任何帮助都是巨大的

Answer 1

diveSiteArray 是 DiveSiteSimpleModel 结构的数组。当您收到错误时，您将 diveSiteArray 视为 DiveSiteSimpleModel 的实例，而不是它实际的数组。您需要在 diveSiteArray 中引用其中一个 DiveSiteSimpleModel 结构，例如:

diveSiteLabel = diveSiteArray[0].name

获取数组中第一个结构体的名称元素。