NSNotificationCenter不工作

Question

我这样做通知:我用mainView编写代码：

- (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.
   }

它不起作用。我做错什么了？

Answer 1

如果你想在weatherViewController中调用通知，你需要定义这个类的viewDidLoad方法。

确保您调用的是此viewController的viewDidLoad。