NSURL *baseUrl = [NSURL URLWithString:@"http://api.openweathermap.org"];
STHTTPNetTaskQueueHandler *httpHandler = [[STHTTPNetTaskQueueHandler alloc] initWithQueue:[STNetTaskQueue sharedQueue] baseURL:baseUrl];
[STNetTaskQueue sharedQueue].handler = httpHandler;

@interface STOpenWeatherNetTask : STHTTPNetTask

@property (nonatomic, strong) NSString *latitude;
@property (nonatomic, strong) NSString *longitude;
@property (nonatomic, strong, readonly) NSString *place;
@property (nonatomic, assign, readonly) float temperature;

@end

@implementation STOpenWeatherNetTask

- (STHTTPNetTaskMethod)method
{
    return STHTTPNetTaskGet;
}

- (NSString *)uri
{
    return @"data/2.5/weather";
}

- (NSDictionary *)parameters
{
    return @{ @"lat": self.latitude,
              @"lon": self.longitude };
}

- (void)didResponseJSON:(NSDictionary *)response
{
    _place = response[@"name"];
    _temperature = [response[@"main"][@"temp"] floatValue] / 10;
}

@end

if (_openWeatherTask.pending) {
    return;
}
_openWeatherTask = [STOpenWeatherNetTask new];
_openWeatherTask.latitude = @"1.306038";
_openWeatherTask.longitude = @"103.772962";
// Task delegate will be a weak reference, so no need to remove it manually.
// Duplicated task delegates will be ignored by STNetTaskQueue, so it's fine to invoke addTaskDelegate here.
[[STNetTaskQueue sharedQueue] addTaskDelegate:self uri:_openWeatherTask.uri];
[[STNetTaskQueue sharedQueue] addTask:_openWeatherTask];

- (void)netTaskDidEnd:(STNetTask *)task
{
    // It's necessary to detect if _openWeatherTask != task and return,
    // if you have mutiple instance/viewController deleagating the same uri.
    if (_openWeatherTask != task) {
        return;
    }
    
    if (task.error) { // Would be network issue
        _resultLabel.text = @"Network Unavailable";
        _goBtn.hidden = YES;
        return;
    }
    
    _resultLabel.text = [NSString stringWithFormat:@"%@\n%.1f°C", _openWeatherTask.place, _openWeatherTask.temperature];
    _goBtn.hidden = YES;
}