how to print barcode in vb.net 2008 Figure 5.5 A look at the connections automatically created for a controller s table view in Objective-C

Drawing QR Code JIS X 0510 in Objective-C Figure 5.5 A look at the connections automatically created for a controller s table view

Figure 5.5 A look at the connections automatically created for a controller s table view
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Creating basic view controllers
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figure 5.5, it already has connections created for its dataSource and delegate properties. Next, you need to fill the table with content.
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Building up a table interface
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As the data source, the controller needs to provide the view with its content. This is why you created a subclass for your table view controller and why every one of your table view controllers should have its own subclass: each will need to fill in its data in a different way. We ve mentioned that the UITableViewDataSource protocol declares the methods your table view controller should pay attention to in order to correctly act as the data source. The main work of filling in a table is done by the tableView:cellForRowAtIndexPath: method. When passed a row number, this method should return the UITableViewCell for that row of your table. Before you can get to that method, though, you need to do some work. First, you must define the content that will fill your table. Then, you must define how large the table will be. Only then can you fill in the table using the tableView:cellForRowAtIndexPath: method. In addition to these major table view elements, we ll also cover two optional variants that can change how a table looks: accessory views and sections.
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CREATING THE CONTENT
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You can use numerous SDK objects to create a list of data that your table should contain. In chapter 9, we ll talk about SQLite databases; and in chapter 14, we ll discuss pulling RSS data off the Internet. For now, we stay with the SDK s simpler objects. The most obvious are NSArray, which produces a static indexed array; NSMutableArray, which creates a dynamic indexed array; and NSDictionary, which defines an associative array. For this example of table view content creation, you ll create an NSArray containing an NSDictionary that itself contains color names and UIColor values. As you can probably guess, you ll fill this skeletal table view example with something like the color selector that you wrote back when you were learning about views in chapter 4. The code required to create your content array is shown here:
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- (void)viewDidLoad { colorList = [NSArray arrayWithObjects: [NSDictionary dictionaryWithObjectsAndKeys: @"brownColor",@"titleValue", [UIColor brownColor],@"colorValue",nil], [NSDictionary dictionaryWithObjectsAndKeys: @"orangeColor",@"titleValue", [UIColor orangeColor],@"colorValue",nil], [NSDictionary dictionaryWithObjectsAndKeys: @"purpleColor",@"titleValue", [UIColor purpleColor],@"colorValue",nil], [NSDictionary dictionaryWithObjectsAndKeys: @"redColor",@"titleValue", [UIColor redColor],@"colorValue",nil],
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The table view controller
nil]; [colorList retain]; }
You should do this sort of setup before the view appears. Here, you do it in the viewDidLoad method. This method is called prior to the view appearing and is a good place to do your initialization. The array and dictionary creations are simple. The Apple class references contain complete information about how to create and manipulate these objects; but, in short, you can create an NSArray as a listing of objects ending in a nil, and you can create an NSDictionary using pairs of values and keys, ending in a nil. Here, you re creating an array containing four dictionaries, each of which will fill one line of your table. You also have to think about memory management here. Because your array was created with a class factory method, it ll be released when it goes out of scope. In order to use this array elsewhere in your class, you not only need to have defined it in your header file, but also need to send it a retain message to keep it around. You ll release it in your dealloc method, elsewhere in the class files.
BUILDING YOUR TABLE CELLS
When you ve set up a data backend for your table, you need to edit three methods in your table view controller file: two that define the table and one that fills it, as shown in listing 5.1. We ll explain each of these in turn.
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