UILocalNotification 的 userInfo 对象的一致性要求

Question

使用Swift-2.2,

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

你能告诉我需要如何更改此结构才能符合 UserInfo 的要求吗？

我读了一些关于

a) UserInfo 不能是结构体（但我也尝试使用 class - 它也不起作用）

b) "plist type" 一致性 --> 但我该怎么做呢？

c) "NSCoder" 和 "NSObject" 一致性 --> 但我该怎么做呢？

我收到的错误消息运行下面的代码是：

"unable to serialize userInfo"

感谢您对此的任何帮助。

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：

You may add arbitrary key-value pairs to this dictionary. However, the keys and values must be valid property-list types; if any are not, an exception is raised.

您需要自己将数据转换为这种类型。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
        }
    }
}

然后你可以使用myData.dictionaryRepresentation()转换成字典，MeetingData(dictionaryRepresentation: ...)从字典转换。

UILocalNotification 的 userInfo 对象的一致性要求

conformity requirements for userInfo object of UILocalNotification

swift

uilocalnotification

userinfo