如果这么：let setting = UIUserNotificationSettings(forTypes: .Alert|.Badge|.Sound, categories: nil )
会提示错误 ：Binary operator '|' cannot be applied to two UIUserNotificationType operands
解决办法：
let setting = UIUserNotificationSettings(forTypes: [.Alert,.Badge,.Sound], categories: nil)
原文链接：https://www.f2er.com/swift/325608.html