无法将类型“[String : String?]”的值转换为预期的参数类型“[String : AnyObject?]”

Question

我是 Swift 新手，我遵循了本教程：http://www.raywenderlich.com/90971/introduction-mapkit-swift-tutorial 关于 MapKit。问题是我在这行代码上遇到了错误

let placemark = MKPlacemark(coordinate: self.coordinate, addressDictionary: addressDict)

错误在标题中描述。包含这一行的方法是：

func mapItem() -> MKMapItem {
    let addressDict = [String(kABPersonAddressStreetKey): self.subtitle]
    let placemark = MKPlacemark(coordinate: self.coordinate, addressDictionary: addressDict)

    let mapItem = MKMapItem(placemark: placemark)
    mapItem.name = self.title

    return mapItem
}

请帮忙。

Answer 1

您需要将subtitle 转换为AnyObject，如下所示：

let addressDict = [String(kABPersonAddressStreetKey): self.subtitle as! AnyObject]

您的完整代码将是：

func mapItem() -> MKMapItem {
    let addressDict = [String(kABPersonAddressStreetKey): self.subtitle as! AnyObject]
    let placemark = MKPlacemark(coordinate: self.coordinate, addressDictionary: addressDict)

    let mapItem = MKMapItem(placemark: placemark)
    mapItem.name = self.title

    return mapItem
  }