(47)Notification Demo example

ViewController.h

#import <UIKit/UIKit.h>

@class MyViewController;

@interface ip21ViewController : UIViewController

@property (nonatomic, retain) MyViewController *myvc;

@end

ViewController.m

 

#import "MyViewController.h"

@synthesize myvc;

- (void)viewDidLoad

{

    [super viewDidLoad];

    myvc = [[MyViewController alloc] init];

    myvc.view.frame = CGRectMake(60, 60, myvc.view.frame.size.width, myvc.view.frame.size.height);

    [self.view addSubview:myvc.view];

   

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(didColorChangeNotification:)

                                                 name:@"ColorChangeNotification"

                                               object:nil];

}

- (void)didColorChangeNotification:(NSNotification *)aNotification

{

    if([aNotification.name isEqualToString:@"ColorChangeNotification"])

    {

        NSDictionary *dict = [aNotification userInfo];

       

        int c = [[dict objectForKey:@"Color"] integerValue];

       

        if(c == 1)

            self.view.backgroundColor = [UIColor redColor];       

        else if(c == 2)

            self.view.backgroundColor = [UIColor greenColor];

        else if(c == 3)

            self.view.backgroundColor = [UIColor blueColor];

        else

            self.view.backgroundColor = [UIColor grayColor];

    }

}

MyViewController.h

#import <UIKit/UIKit.h>

@interface MyViewController : UIViewController

- (IBAction)buttoCLicked:(UIButton *)sender;

@end

MyViewController.m

 

- (IBAction)buttoCLicked:(UIButton *)sender

{

    NSDictionary *info = [[NSDictionary alloc] initWithObjectsAndKeys:[NSString stringWithFormat:@"%d", sender.tag], @"Color", nil];

       

    [[NSNotificationCenter defaultCenter] postNotificationName:@"ColorChangeNotification" object:nil userInfo:info];

}