Ios NSNotificationCenter没有'；行不通

我做如下通知：我在mainView中有代码：

- (void)viewDidLoad
{

CGRect view1Hrame;
view1Hrame.origin.x = 160;
view1Hrame.origin.y = 215;
view1Hrame.size = self.currenWeatherView.frame.size;

weatherViewController *view1 = [[weatherViewController alloc] initWithForecast:[[Forecast alloc] initWithForecastInCurrentLocation]];    

[[NSNotificationCenter defaultCenter] addObserver:view1 selector:@selector(forecastChanged) name:@"forecastChanged" object:nil];

view1.view.backgroundColor = [UIColor colorWithRed:0 green:255 blue:0 alpha:0.06];

[currenWeatherView addSubview: view1.view];
}

在预测类中：

 [[NSNotificationCenter defaultCenter] postNotificationName:@"forecastChanged" object:nil];

在weatherViewController中

 - (void)viewDidLoad
  {
   [super viewDidLoad];

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

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

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它不起作用。我做错了什么？

如果要在

weatherViewController

中调用通知，则需要定义此类的viewDidLoad方法

---

确保正在调用此viewController的viewDidLoad

不工作意味着？？您是否实现了forecastChanged？-（void）forecastChanged{NSLog（@“111”）；self.cityName.text=currentForecast.cityName；self.Current湿度.text=[[NSNumber numberWithFloat:currentForecast.湿度]stringValue]；self.minTemp.text=[[NSNumber numberWithFloat:currentForecast.minTemp]stringValue]；self.maxTemp.text=[[NSNumber numberWithFloat:currentForecast.maxTemp]stringValue]；self.currentTemp.text=[[NSNumber numberWithFloat:currentForecast.currentTemp]stringValue]；}