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You may be wondering how the iPhone Simulator handles location detection. Apple has cleverly hardcoded the location of the simulator to 1 Infinite Loop in Cupertino, California the location of Apple s corporate headquarters.
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If you build and run your application, you ll see that a second or two after the application launches, your list of stations is sorted, with Fremont at the top, since this is the closest location to your simulator.
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Putting the Finishing Touches on Routesy BART
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So far, you ve built a reasonably useful application that serves its basic purpose: telling a user when the next train will arrive at the nearest station. However, there are a few easily implementable details that will add a bit of extra usefulness to Routesy. The default cell style on
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CHAPTER 7: Going the Routesy Way with Core Location, XML, and SQLite
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the station table isn t particularly helpful. It would be useful to show the user how far away the nearest station is. Let s finish by creating a custom table cell for the station table view. If these steps seem familiar, it s because they are the same steps we took to create the custom cell for the predictions table. 1. First, let s create a class for the custom table view cell. The code for this class is shown in Listing 7-15. This cell will display a station, so call it StationCell, and place it in the View folder. Remember that Xcode provides you with a helpful template for creating subclasses of UITableViewCell. The code for this class is very simple. Create and synthesize two properties, stationNameLabel and distanceLabel, one for each of the values that the cell will display, and make sure to place an IBOutlet declaration before the type in each property so that you can connect the labels in Interface Builder to your class.
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Listing 7-15. Creating a Class for the Custom Station Table Cell
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// // // StationCell.h
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#import <UIKit/UIKit.h> @interface StationCell : UITableViewCell { UILabel *stationNameLabel; UILabel *distanceLabel; } @property (nonatomic,retain) IBOutlet UILabel *stationNameLabel; @property (nonatomic,retain) IBOutlet UILabel *distanceLabel; @end // // //
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StationCell.m
#import "StationCell.h" @implementation StationCell @synthesize stationNameLabel, distanceLabel; - (void)dealloc { [stationNameLabel release];
CHAPTER 7: Going the Routesy Way with Core Location, XML, and SQLite
[distanceLabel release]; [super dealloc]; } @end
2. Next, create an Interface Builder XIB file for your new cell called StationCell.xib, and place it in your resources folder. Again, you ll use an empty XIB file and place one cell from the library in the file. Set the cell s identifier to station and the class to the StationCell class you created previously, as shown in Figure 7-27, the same way you did for PredictionCell. Make sure your cell attributes are identical to the ones in the image shown in Figure 7-27.
Figure 7-27. Setting the station cell s attributes
3. Now, drag two labels into your table cell, as shown in Figure 7-28: one for the station name and one for the distance. Connect the two outlets to your labels so that you ll be able to access them from your code.
CHAPTER 7: Going the Routesy Way with Core Location, XML, and SQLite
Figure 7-28. Connecting the station cell s label outlets
4. Finally, we ll set up RootViewController to load your new table cell, the same way you did previously for the predictions table. You ll notice in Listing 7-16 that we re again defining a createNewCell method that will load instances of the new cell into the table view. We also have to change the cellForRowAtIndexPath implementation to set the values for the fields we created. Note that we re using a formatted string to round the digits of the distance to a single decimal place to make it more display-friendly. We also need to implement another table view delegate method on RootViewController to make sure that tapping the blue accessory arrow button on each cell causes the cell to behave as if it were selected by the user. This is necessary because the blue buttons can be configured to perform additional functions beyond simply selecting the cell. In our example, we simply implement accessoryButtonTappedForRowWithIndexPath to select the cell programmatically.
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