Various code samples for Google iOS SDK Blog Posts

Constants.m

NSString* const api_forecast_layers_cap = @"http://datapoint.metoffice.gov.uk/public/data/layer/wxfcs/all/json/capabilities?key=%@";
NSString* const api_obs_layers_cap = @"http://datapoint.metoffice.gov.uk/public/data/layer/wxobs/all/json/capabilities?key=%@";

SelectLayer.m

-(void) selectLayer: (NSString*)layerID withTimeSteps: (NSArray *)timestep_set{
        for(NSString *timestep in timestep_set){

        	NSURL *hourlyCall = [NSURL URLWithString: [NSString stringWithFormat: @"http://datapoint.metoffice.gov.uk/public/data/layer/wxobs/%@/png?TIME=%@Z&key=%@", layerID, timestep, MET_OFFICE_API_KEY]];
        
	        NSLog(@"Calling URL: %@", [hourlyCall absoluteString]);
	        NSURLRequest *request = [NSURLRequest requestWithURL: hourlyCall];
	        AFImageRequestOperation *operation = [[AFImageRequestOperation alloc] initWithRequest:request];
	        [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    
	            //Check for a UIImage before adding it to the array
	            if([responseObject class] == [UIImage class]){
                
	            	// Setup our image object and write it to our array
                	SGMetOfficeForecastImage *serverImage = [[SGMetOfficeForecastImage alloc] init];
                	serverImage.image = [UIImage imageWithData: operation.responseData];
                	serverImage.timestamp = timestep;
                	serverImage.timeStep = nil;
                	serverImage.layerName = layerID;
                
                	[overlayArray addObject: serverImage];
                
                	// Increment our expected count so that we know when to start playing the animation
                	imagesExpected = @([imagesExpected intValue] + 1);
            		}
        	} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
            		//We didn't get the image but that won't stop us!
            		imagesExpected = @([imagesExpected intValue] + 1);
            		NSLog(@"Couldn't download image.");
        	}];
        
        	[operation start];
		
		// Start the Timer to check that we have all the images we requested downloaded and stored in the layer array
	    	checkDownloads = [NSTimer scheduledTimerWithTimeInterval: 1 target:self selector:@selector(checkAllImagesHaveDownloaded:) userInfo: [NSNumber numberWithInt: [timestep_set count]] repeats: YES];
    	}
    }