NotificationCenter registered selector is not called

问题

I currently have this code below to see if the day has elapsed, but it doesn't seem to be working. Have I coded this correctly?

NotificationCenter.default.addObserver(self, selector:"calendarDayDidChange:", name:NSNotification.Name.NSCalendarDayChanged, object:nil)

func calendarDayDidChange(notification : NSNotification) {
    // code to respond to notification
}

回答1:

I think the way you registered observer is not correct. Please try the below and check.

NotificationCenter.default.addObserver(self, selector:#selector(self.calendarDayDidChange(notification:)), name:NSNotification.Name.NSCalendarDayChanged, object:nil)

来源：https://stackoverflow.com/questions/45380920/notificationcenter-registered-selector-is-not-called