Question

使用Swift-2.2，

我想将'struct'或'class object'传递给UILocalNotification的userInfo。（见下面的代码图）。

您能否告诉我如何更改此结构以符合UserInfo的要求？

我读了一些关于

的内容

a）UserInfo不能是一个结构（但我也尝试过一个类 - 它也不起作用）

b）“plist type”符合性 - ＆gt;但是我该怎么做呢？

c）“NSCoder”和“NSObject”一致性 - ＆gt;但是我该怎么做呢？

我运行以下代码的错误消息是：

“无法序列化userInfo”

感谢您对此提供任何帮助。

struct MeetingData {
    let title: String
    let uuid: String
    let startDate: NSDate
    let endDate: NSDate
}

let notification = UILocalNotification()
notification.category = "some_category"
notification.alertLaunchImage = "Logo"
notification.fireDate = NSDate(timeIntervalSinceNow: 10)
notification.alertBody = "Data-Collection Request!"
//        notification.alertAction = "I want to participate"
notification.soundName = UILocalNotificationDefaultSoundName

let myData = MeetingData(title: "myTitle",
                          uuid: "myUUID",
                     startDate: NSDate(),
                       endDate: NSDate(timeIntervalSinceNow: 10))

// that's where everything crashes !!!!!!!!!!!!!!
notification.userInfo = ["myKey": myData] as [String: AnyObject]

Answer 1

正如UILocalNotification.userInfo的文档所说：

您可以向此词典添加任意键值对。但是，键和值必须有效property-list types;如果没有，则会引发异常。

您需要自己将数据转换为此类型。你可能想做这样的事情：

enum Keys {
    static let title = "title"
    static let uuid = "uuid"
    static let startDate = "startDate"
    static let endDate = "endDate"
}
extension MeetingData {
    func dictionaryRepresentation() -> NSDictionary {
        return [Keys.title: title,
                Keys.uuid: uuid,
                Keys.startDate: startDate,
                Keys.endDate: endDate]
    }
    init?(dictionaryRepresentation dict: NSDictionary) {
        if let title = dict[Keys.title] as? String,
            let uuid = dict[Keys.uuid] as? String,
            let startDate = dict[Keys.startDate] as? NSDate,
            let endDate = dict[Keys.endDate] as? NSDate
        {
            self.init(title: title, uuid: uuid, startDate: startDate, endDate: endDate)
        } else {
            return nil
        }
    }
}

然后，您可以使用myData.dictionaryRepresentation()转换为字典，MeetingData(dictionaryRepresentation: ...)转换为字典。

UILocalNotification的userInfo对象的符合性要求

1 个答案: