不能用字符串下标字典

Question

我编写了以下函数来访问 userInfo 字典：

func updateAddressLabel(notification: NSNotification) {
    let userInfo:Dictionary<String,AnyObject> = notification.userInfo as! Dictionary<String, AnyObject>
    self.infoLabelAddress.text = userInfo["geocodeLocation"]
}

func updateDispatchInformation(notification: NSNotification) {
    let userInfo:Dictionary<String,AnyObject> = notification.userInfo as! Dictionary<String, AnyObject>

    let streetName = userInfo["streetName"]
    let incidentLatitude = userInfo["latitude"]
    let incidentLongitude = userInfo["longitude"]

    // Set Dispatch Info Label
    self.infoLabelTitle.text = "Notruf"
    self.infoLabelAddress.text = streetName

    self.createIncidentAnnotation(incidentLatitude, longitude: incidentLongitude)
}

但是我无法访问密钥，因为我收到错误消息：

Cannot subscript a value of type 'Dictionary String,AnyObject> with an index of type 'String'

Answer 1

userInfo 是 Dictionary<String,AnyObject>，要将值分配给特定类型，例如 String，您必须向下转换对象，例如

self.infoLabelAddress.text = userInfo["geocodeLocation"] as! String

Answer 2

您正在尝试将 AnyObject 分配给标签的 text 属性。我会去：

func updateAddressLabel(notification: NSNotification) {
    if let userInfo = notification.userInfo as? Dictionary<String,AnyObject>, let geocodeLocation = userInfo["geocodeLocation"] as? String {
        infoLabelAddress.text = geocodeLocation
    }
}

不能用字符串下标字典

Cannot subscript Dictionary with String

nsdictionary

swift