IOS通知的注册和调用

注册通知

 [[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(changeLabelText:)name:@"ChangeLabelTextNotification"object:nil];

通知方法:

-(void)changeLabelText:(NSNotification *)notification{

    id text = notification.object;

    UILabel *label = (UILabel*)[self.viewviewWithTag:102];

    label.text = text;

}

通知的调用：

[[NSNotificationCenterdefaultCenter]postNotificationName:@"ChangeLabelTextNotification"object:self._textField.text];