Use of KVO (1)

1. Add the following method to a class:

-(void) Viewwillappear: (BOOL) animated{

[[Nsnotificationcenter Defaultcenter] addobserver:self selector: @selector (oneobjhandleinfo:) name:@ " Notificationviewcontroller "Object:nil";

}

-(void) Viewwilldisappear: (BOOL) animated{

[[Nsnotificationcenter Defaultcenter] removeobserver:self];

}

//

-(void) Oneobjhandleinfo: (nsnotification*) notification{

Get Acceptance data and print

NSString *getsendvalue = [[Notification UserInfo] valueforkey:@ "Key-name"];

NSLog (@ "=====%@========", Getsendvalue);

}

2, implementation notification: can be placed directly in a different class file, can also be called in this file

[[Nsnotificationcenter Defaultcenter] postnotificationname:@ "Notificationviewcontroller" Object:self userInfo:@{@ " Key-name ": @" Value-name "}];

Use of KVO (1)