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

Posted 2023-03-14

【中文标题】无法将“NSMutableDictionary”类型的值转换为预期的参数类型“[String: AnyObject]？”

【英文标题】：Cannot convert value of type 'NSMutableDictionary' to expected argument type '[String: AnyObject]?'

【发布时间】：2016-07-09 10:57:23

【问题描述】：

我想跳过使用 Xcode 7.3.1 并转换我的代码，但我在这里遇到了一些问题，这就是我过去在 Swift 1.1 中使用它的方式，但我收到错误 - 无法转换值类型为“NSMutableDictionary”的参数类型为“[String: AnyObject]？”：

private func getPlacemark() -> CLPlacemark
  

    var addressDict = NSMutableDictionary()
    var formattedAddressArray = self.formattedAddress.componentsSeparatedByString(", ") as Array

    let kSubAdministrativeArea = "SubAdministrativeArea"
    let kSubLocality           = "SubLocality"
    let kState                 = "State"
    let kStreet                = "Street"
    let kThoroughfare          = "Thoroughfare"
    let kFormattedAddressLines = "FormattedAddressLines"
    let kSubThoroughfare       = "SubThoroughfare"
    let kPostCodeExtension     = "PostCodeExtension"
    let kCity                  = "City"
    let kZIP                   = "ZIP"
    let kCountry               = "Country"
    let kCountryCode           = "CountryCode"

    addressDict.setObject(self.subAdministrativeArea, forKey: kSubAdministrativeArea)
    addressDict.setObject(self.subLocality, forKey: kSubLocality)
    addressDict.setObject(self.administrativeAreaCode, forKey: kState)

    addressDict.setObject(formattedAddressArray.first! as NSString, forKey: kStreet)
    addressDict.setObject(self.thoroughfare, forKey: kThoroughfare)
    addressDict.setObject(formattedAddressArray, forKey: kFormattedAddressLines)
    addressDict.setObject(self.subThoroughfare, forKey: kSubThoroughfare)
    addressDict.setObject("", forKey: kPostCodeExtension)
    addressDict.setObject(self.locality, forKey: kCity)


    addressDict.setObject(self.postalCode, forKey: kZIP)
    addressDict.setObject(self.country, forKey: kCountry)
    addressDict.setObject(self.ISOcountryCode, forKey: kCountryCode)


    var lat = self.latitude.doubleValue
    var lng = self.longitude.doubleValue
    var coordinate = CLLocationCoordinate2D(latitude: lat, longitude: lng)

  var placemark = MKPlacemark(coordinate: coordinate, addressDictionary: addressDict ) <-- getting error //Cannot convert value of type 'NSMutableDictionary' to expected argument type '[String: AnyObject]?'


    return (placemark as CLPlacemark)

提前致谢！

【参考方案1】：

与不可变 NSDictionary 不同，可变 NSMutableDictionary 与 Swift Dictionary 无关，不能桥接或强制转换。

有一个简单的规则可以避免这些问题：

在 Swift 中，尽可能使用 Swift 原生集合类型。

var addressDict = [String:AnyObject]()
...
addressDict[kSubAdministrativeArea] = self.subAdministrativeArea
...