vb.net print barcode labels 7: Going the Routesy Way with Core Location, XML, and SQLite in Objective-C

Making Data Matrix ECC200 in Objective-C 7: Going the Routesy Way with Core Location, XML, and SQLite

CHAPTER 7: Going the Routesy Way with Core Location, XML, and SQLite
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27. We also need a way to tell the prediction controller what station the user selected. We can do that by grabbing a reference to the station object and setting it into a property on the prediction controller. Create an instance variable and property called station on the prediction controller for the station. The type for this property is Station, and you should create and synthesize this property on PredictionTableViewController in the same way you ve created properties for other classes during this exercise. When creating new properties and instance variables, don t forget to release them in your class s dealloc method as well, to avoid memory leaks. 28. Then, back in RouteViewController, we can get a reference to the selected station using the row index provided in indexPath and set it into the new property we just created, so that the prediction controller knows which station was selected.
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- (void)tableView:(UITableView*)tableView didSelectRowAtIndexPath:(NSIndexPath*)indexPath{ Station *selectedStation = [self.stations objectAtIndex:indexPath.row]; self.predictionController.station = selectedStation; [self.navigationController pushViewController:self.predictionController animated:YES]; } UIViewController, the prediction controller s base class, has a method called viewWillAppear that is called before a view is displayed to the user. We can implement this
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method on PredictionTableViewController to set the title that will be displayed on the screen before the prediction screen is displayed to the user. 29. In PredictionTableViewController.m, implement this method:
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- (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; self.title = self.station.name; }
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30. Build and run your application again, and when you tap a station name, you ll see your new table view controller slide into view with the name of the station you selected displayed at the top of the second screen. We don t have any data to display yet, so that will be the next big step.
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Bringing Real-Time Predictions to Routesy
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Now that we have your model and controllers in place, we re ready to start loading real-time predictions from the BART data feed. To keep our application nice and clean, we ll encapsulate the logic for loading feed data into a new class, called BARTPredictionLoader.
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CHAPTER 7: Going the Routesy Way with Core Location, XML, and SQLite
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1. Create a new class by choosing File class for your new class.
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New File, and choose NSObject as the base
There are a few things we ll need to make our BARTPredictionLoader class as useful as possible. We re going to create a method that will asynchronously grab the XML data from the BART feed. We ll also create a custom protocol so that we can assign a callback delegate, so that our code can be easily notified when the XML data has finished loading. There will be two NSMutableData properties: one for the data we re loading and a copy of the last successfully loaded data. Finally, we ll make a singleton instance of BARTPredictionLoader that your application can access from anywhere. Listing 7-4 shows what your header definition should look like.
Listing 7-4. Creating the BARTPredictionLoader Interface
// // // BARTPredictionLoader.h
#import <Foundation/Foundation.h> #import <SystemConfiguration/SystemConfiguration.h> @protocol BARTPredictionLoaderDelegate - (void)xmlDidFinishLoading; @end @interface BARTPredictionLoader : NSObject { id _delegate; NSMutableData *predictionXMLData; NSMutableData *lastLoadedPredictionXMLData; } + (BARTPredictionLoader*)sharedBARTPredictionLoader; - (void)loadPredictionXML:(id<BARTPredictionLoaderDelegate>)delegate; @property (nonatomic,retain) NSMutableData *predictionXMLData; @property (nonatomic,retain) NSMutableData *lastLoadedPredictionXMLData; @end
2. Next, you ll need to actually implement the code to load data from the BART feed. Let s start by implementing loadPredictionXML. Notice that this method takes as an argument a delegate object that implements our protocol, BARTPredictionLoaderDelegate. Our code will set the delegate into the _delegate instance variable, where we ll keep it until we need it.
CHAPTER 7: Going the Routesy Way with Core Location, XML, and SQLite
3. Before attempting to call the network, you should make sure that the network is currently available on the iPhone. The SCNetworkReachability functions provided by SystemConfiguration.framework will allow you to do just that. 4. Assuming that the reachability flags indicate that the network is available, you can use NSURLConnection to create an asynchronous connection to load the data from the BART feed, as shown in Listing 7-5.
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