Google Places api没有返回任何内容

Question

我正在尝试在MKMapView上显示Google商家信息的结果。调用代码来检索数据，但它没有记录任何内容。我不认为问题在于添加了注释，因为在日志中，它返回Google Data: ( )而没有任何内容。我该如何解决这个问题。这是我正在使用的代码 -

-(void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated {
    //Get the east and west points on the map so you can calculate the distance (zoom level) of the current map view.
    MKMapRect mRect = self.schoolMap.visibleMapRect;
    MKMapPoint eastMapPoint = MKMapPointMake(MKMapRectGetMinX(mRect), MKMapRectGetMidY(mRect));
    MKMapPoint westMapPoint = MKMapPointMake(MKMapRectGetMaxX(mRect), MKMapRectGetMidY(mRect));

    //Set your current distance instance variable.
    currenDist = MKMetersBetweenMapPoints(eastMapPoint, westMapPoint);

    //Set your current center point on the map instance variable.
    currentCentre = self.schoolMap.centerCoordinate;
}

-(void) queryGooglePlaces: (NSString *) googleType {

    CLLocation *userLoc = self.schoolMap.userLocation.location;
    CLLocationCoordinate2D userCoordinate = userLoc.coordinate;
    //Change the 9000!!
    // Build the url string to send to Google. NOTE: The kGOOGLE_API_KEY is a constant that should contain your own API key that you obtain from Google. See this link for more info:
    // https://developers.google.com/maps/documentation/places/#Authentication
    NSString *url = [NSString stringWithFormat:@"https://maps.googleapis.com/maps/api/place/search/json?location=%f,%f&radius=%@&types=%@&sensor=true&key=%@", currentCentre.latitude, currentCentre.longitude, [NSString stringWithFormat:@"%i", currenDist], googleType, kGOOGLE_API_KEY];

    //Formulate the string as a URL object.
    NSURL *googleRequestURL=[NSURL URLWithString:url];

    // Retrieve the results of the URL.
    dispatch_async(kBgQueue, ^{
        NSData* data = [NSData dataWithContentsOfURL: googleRequestURL];
        [self performSelectorOnMainThread:@selector(fetchedData:) withObject:data waitUntilDone:YES];
    });
}

-(void)fetchedData:(NSData *)responseData {
    //parse out the json data
    NSError* error;
    NSDictionary* json = [NSJSONSerialization
                          JSONObjectWithData:responseData

                          options:kNilOptions
                          error:&error];

    //The results from Google will be an array obtained from the NSDictionary object with the key "results".
    NSArray* places = [json objectForKey:@"results"];

    //Write out the data to the console.
    NSLog(@"Google Data: %@", places);
    [self plotPositions:places];
}

-(void)plotPositions:(NSArray *)data {
    // 1 - Remove any existing custom annotations but not the user location blue dot.
    for (id<MKAnnotation> annotation in self.schoolMap.annotations) {
        if ([annotation isKindOfClass:[MapPoint class]]) {
            [self.schoolMap removeAnnotation:annotation];
        }
    }
    // 2 - Loop through the array of places returned from the Google API.
    for (int i=0; i<[data count]; i++) {
        //Retrieve the NSDictionary object in each index of the array.
        NSDictionary* place = [data objectAtIndex:i];
        // 3 - There is a specific NSDictionary object that gives us the location info.
        NSDictionary *geo = [place objectForKey:@"geometry"];
        // Get the lat and long for the location.
        NSDictionary *loc = [geo objectForKey:@"location"];
        // 4 - Get your name and address info for adding to a pin.
        NSString *name=[place objectForKey:@"name"];
        NSString *vicinity=[place objectForKey:@"vicinity"];
        // Create a special variable to hold this coordinate info.
        CLLocationCoordinate2D placeCoord;
        // Set the lat and long.
        placeCoord.latitude=[[loc objectForKey:@"lat"] doubleValue];
        placeCoord.longitude=[[loc objectForKey:@"lng"] doubleValue];
        // 5 - Create a new annotation.
        MapPoint *placeObject = [[MapPoint alloc] initWithName:name address:vicinity coordinate:placeCoord];
        [self.schoolMap addAnnotation:placeObject];
    }
}