iOS pop回父级页面，使用通知传值
输入所要发送的信息 ，同时将label的值通过button方法调用传递，
- (IBAction)buttonClick:(id)sender {
//添加 字典，将label的值通过key值设置传递
NSDictionary *dict =[[NSDictionary alloc]initWithObjectsAndKeys:self.textFieldOne.text,@"textOne",self.textFieldTwo.text,@"textTwo", nil];
//创建通知
NSNotification *notification =[NSNotification notificationWithName:@"tongzhi" object:niluserInfo:dict];
//通过通知中心发送通知
[[NSNotificationCenter defaultCenter] postNotification:notification];
[self.navigationController popViewControllerAnimated:YES];
}
在发送通知后，在所要接收的控制器中注册通知监听者，将通知发送的信息接收
- (void)viewDidLoad {
[super viewDidLoad];
//注册通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(tongzhi:) name:@"tongzhi"object:nil];
}
- (void)tongzhi:(NSNotification *)text{
NSLog(@"%@",text.userInfo[@"textOne"]);
NSLog(@"－－－－－接收到通知------");
}