swift3 - 没有 '+' 候选产生预期的上下文结果类型 'NSNumber?' Swift 3

Question

在 Xcode 8 和 Swift 3 上出现错误 + 我尝试了任何方法但没有结果。
这里的代码:

static func addNotificationInterval(title: String, body: String,

indentifier: String, interval: Double) {

    let content = UNMutableNotificationContent()
    content.title = NSString.localizedUserNotificationString(forKey: title, arguments: nil)
    content.body = NSString.localizedUserNotificationString(forKey: body, arguments: nil)
    content.sound = UNNotificationSound.default()
    content.badge = UIApplication.shared.applicationIconBadgeNumber + 1; content.categoryIdentifier = "com.elonchan.localNotification"

    let trigger = UNTimeIntervalNotificationTrigger.init(timeInterval: interval, repeats: true)
    let request = UNNotificationRequest.init(identifier: indentifier, content: content, trigger: trigger)
    let center = UNUserNotificationCenter.current()

    center.add(request)

    print("SetNotifiInterval")

}

错误来自 + :

content.badge = UIApplication.shared.applicationIconBadgeNumber + 1; content.categoryIdentifier = "com.elonchan.localNotification"

错误类型:

没有“+”候选产生预期的上下文结果类型“NSNumber?”

Answer 1

查询 the latest reference of UNMutableNotificationContent :

var badge: NSNumber?

The number to apply to the app’s icon.

在 Swift 3 中，许多隐式类型转换，如 Int至 NSNumber , 被删除。您需要在它们之间显式转换类型。

content.badge = (UIApplication.shared.applicationIconBadgeNumber + 1) as NSNumber; ...