無法將類型'[String：String？]'的值轉換爲期望的參數類型'[String：AnyObject？]'

Question

我是Swift新手，我跟着本教程：關於MapKit的http://www.raywenderlich.com/90971/introduction-mapkit-swift-tutorial。問題是我在這行代碼上遇到錯誤

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

該錯誤在標題上描述。包含此行的方法是：

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 
} 

請幫忙。

Answer 1

你需要投你subtitle爲AnyObject，如下圖所示：

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

和您的完整代碼將是：

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 
    }