通知基本用法NSNotificationCenter

//第一个viewcontriller

@implementation testViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.

   

}

- (IBAction)postBtn:(id)sender {

 //发送通知第一种方法：初始化一个通知在用通知中心发送

//     NSNotification *nofi = [NSNotification notificationWithName:@"testnoti" object:nil userInfo:@{@"zyc":@"123"}];

//    [[NSNotificationCenter defaultCenter]postNotification:nofi];

 //发送通知第二种方法：直接通知中心发送  object和userinfo都是通知的属性

    [[NSNotificationCenter
defaultCenter]postNotificationName:@"testnoti"
object:@"1"
userInfo:@{@"zyc":@"123"}];

}

//第二个viewcontriller

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    //添加监听 然后执行操作

    [[NSNotificationCenter
defaultCenter]addObserver:self
selector:@selector(aa:)
name:@"testnoti"
object:nil];

}

//执行操作

- (void)aa:(NSNotification *)sender{

    NSLog(@"%@",sender);//可以利用通知属性 object userinfo 传值过来

}

- (IBAction)pushto:(id)sender {

    testViewController *testvc = [[testViewController
alloc]init];

    [self.navigationController
pushViewController:testvc animated:YES];

}