Use of IOS nsnotification

Sign up for notifications in the message center first

[[Nsnotificationcenter defaultcenter] addobserver:observer selector: @selector ("function to execute") name:@ "name" ( Objects that need to be observed) Object:nil];

Then send a notification

[[Nsnotificationcenter defaultcenter] postnotificationname:@ "NAME" object:self];

It is important to note that the name of the registration notification is the same as the name of the notification to be sent in order to receive the corresponding notification

Use of IOS nsnotification