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)
}

但我无法访问密钥，因为我收到错误：

无法下标类型的值＆＃39; Dictionary String，AnyObject＆gt;索引类型为＆＃39; String＆＃39;

Answer 1

您正在尝试将AnyObject分配给标签text媒体资源。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
    }
}

Answer 2

userInfo为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

不能用String下标Dictionary

2 个答案: