访问UILocalNotification用户信息时出现Swift错误

Question

I am trying to retrieve the currently scheduled UILocalNotifications. I get an error when I try to implicitly unwrap userInfo from the notification. The error happens on the line

          if let info = notification.userInfo

The error says "Could not find an overload for 'userInfo' that accepts the supplied arguments"

I also tried doing optional chaining with

if let info = notification.userInfo?["Id"]

And I got an error that userInfo does not accept subscripts.

It worked when I used explicit unwrapping after userinfo with

if let info = notification.userInfo!

But I wanted to avoid doing that. Any help would be great. The full method is below.

func test()
{

  let application = UIApplication.sharedApplication()
  let scheduledNotifications = application.scheduledLocalNotifications

  for notification in scheduledNotifications
  {
    println( "found it" ) 

      if let info = notification.userInfo
      {
        println( "in")
      } else {
        // no userInfo dictionary present
        println( "else")
      }
  }
}

Answer 1

application.scheduledLocalNotifiactions提供了一个AnyObject数组，因此您缺少转换为UILocalNotification的类型

 let scheduledNotifications = application.scheduledLocalNotifications as [UILocalNotification]