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The answer to that is out of the scope of this book. If you really want to know the meaning of the %@ symbols, though, consider this. In format strings, @ % character announces a placeholder for a value, with the characters that follow determining the kind of value expected, and how to format it. For example, a format string of "%d houses" expects an integer value to be substituted for the format expression '%d . NSString supports the format characters defined for the ANSI C function print(f), plus @ for any object. If the object responds to the description withLocale: message, NSString sends that message to retrieve the text representation; otherwise, it sends a description message. Next, we pass the string we made to the convenience constructor for the FoodViewController we want to make. Once we have called the convenience constructor we push the new FoodViewController onto the navigation stack, and we ask this push to be animated. Finally, as before, we deselect the row and set animated: YES, thereby finishing the delegate methods for FoodTableViewController.
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- (NSInteger)tableView:(UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath { NSString *text = [NSString stringWithFormat:@"%@%@", [names objectAtIndex: [indexPath row]], @".png"]; FoodViewController* retController = [FoodTableController foodViewControllerWithImageNamed:text]; [[self navigationController] pushViewController:retController animated:YES]; }
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Creating the FoodViewController Class
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The FoodViewController is still missing. This is the last piece of the application and the class handling the highest level of detail in our navigation-based app. When adding the new file for the FoodViewController, be sure to uncheck the UITableViewController subclass checkbox on the file template chooser, as shown in Figure 8 11. Instead, we are going to use a simple view to show the food when the view controller is loaded.
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CHAPTER 8: Table Views, Navigation, and Arrays
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Figure 8 11. Create the FoodViewController, and make sure the UITableViewController subclass box is not checked.
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The FoodViewController Header File
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Open the FoodViewController.h header file. We first want to add a few fields that should be pretty straightforward by now. Add a UIImageView* field and an NSString* field, and name these fields imageView and imageName, respectively. The UIImageView will be an IBOutlet to which we will link later. This image view will display the image of the food the user has selected. The NSString field will hold onto the desired image name until it is needed. We will make properties for both of these fields. Make sure to put IBOutlet in front of the UIImageView. Another task that we must handle is to declare the convenience constructor. This class method takes a single NSString argument, as shown here:
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// // FoodViewController.h #import <UIKit/UIKit.h> @interface FoodViewController : UIViewController { UIImageView* imageView; NSString* imageName; } + (FoodViewController*) foodViewControllerWithImageNamed:(NSString*)name; @property (nonatomic, assign) IBOutlet UIImageView* imageView; @property (nonatomic, copy) NSString* imageName; @end
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CHAPTER 8: Table Views, Navigation, and Arrays
The FoodViewController Convenience Constructor
There are only two things we need to do in the FoodViewController implementation file: create the convenience constructor, and load an image for when the view loads. Let s start with the constructor. Just like before, we start by creating a directive with the name of the nib called FoodViewControllerNibName,with the appropriate nib name. Next, we need to make sure we have all of our properties synthesized. Copying and pasting the method signature should get us started on our convenience constructor. The first line in the convenience constructor creates the FoodViewController instance that we will return, passing the directive to initWithNibName:bundle. The image name is then set through a property method call, a sub-routine that helps manage resources efficiently. Finally, the newly created instance is sent an autorelease message, and the result from that message is returned.
// // FoodViewController.m
#import "FoodViewController.h" #define FoodViewControllerNibName @"FoodViewController" @implementation FoodViewController @synthesize imageView; @synthesize imageName; + (FoodViewController*) foodViewControllerWithImageNamed:(NSString*)name { FoodViewController* retController = [[FoodViewController alloc] initWithNibName:FoodViewControllerNibName bundle:nil]; [retController setImageName:name]; return [retController autorelease]; }
Setting Up FoodViewController, -viewDidLoad, and the (.xib)
The last bit of code we need is to override viewDidLoad in FoodViewController.m. All we need to do is add a few lines of code. The image for the UIImageView outlet that was created in the header needs a photo to display. So we simply create a UIImage with the class method call of +imageNamed. This creates an image with the data from the file with the passed name. Setting this image on the UIImageView will make it visible. We also don t need imageName anymore, now that the image has been loaded, so we release it.
- (void) viewDidLoad { [imageView setImage:[UIImage imageNamed:imageName]]; [imageName release]; }
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