vb.net print barcode labels A table for a navigator in Objective-C

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Listing 7.2 A table for a navigator
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- (void) viewDidLoad { self.title = @"Color List"; colorList = [NSArray arrayWithObjects: [NSDictionary dictionaryWithObjectsAndKeys: @"Red",@"titleValue", [UIColor redColor],@"colorValue",nil], [NSDictionary dictionaryWithObjectsAndKeys: @"Green",@"titleValue", [UIColor greenColor],@"colorValue",nil], [NSDictionary dictionaryWithObjectsAndKeys: @"Blue",@"titleValue", [UIColor blueColor],@"colorValue",nil], nil]; [colorList retain]; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [colorList count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *MyIdentifier = @"MyIdentifier";
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The navigation controller
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UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:MyIdentifier] autorelease]; } cell.text = [[colorList objectAtIndex:indexPath.row] objectForKey:@"titleValue"]; cell.textColor = [[colorList objectAtIndex:indexPath.row] objectForKey:@"colorValue"]; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; return cell; }
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There s nothing new here, but we ve included it to clarify the rest of the discussion of the navigation controller. Figure 7.6 shows what this application looks like on both devices.
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ADDING ACTIONS
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If you want, you can move right on to using your navigation controller. Alternatively, you can do some extra work with buttons. In addition to the standard navigation controls, you can add buttons to the navigation bar. You do so through the leftBarButtonItem and rightBarButtonItem properties of the UINavigationItem. A left
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Figure 7.6 The navigation controller shown on both the iPad and iPhone
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Creating advanced view controllers
button replaces the Back button, and a right button sits in the usually blank right side of the navigation bar. As we ve noted, each view controller is linked to its own navigation item. A view controller can access its navigation item through the navigationItem property at any time. When you set a button, you must set it to be a UIBarButtonItem object, which you have to create. You can use four init methods, as shown in table 7.2. You ll probably instantiate the buttons in the viewDidLoad: method, the same place where you should initialize your array for use with the table view.
Table 7.2 You can create navigation bar button items using a variety of methods to get precisely what you want. Method initWithBarButtonSystemItem:target:action: Summary Creates a standard button drawn from UIButtonSystemItem Creates a special button Creates a button with a picture Creates a button with a word
initWithCustomView: initWithImage:style:target:action: initWithTitle:style:target:action:
Note that all the buttons except the custom-view button come with their own target and action links. These are the simpler target-action mechanisms that we alluded to in the previous chapter. They work exactly like the more complex target-action mechanisms but are built in. Here s how you can create a button as part of the page represented by your UITableViewController:
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(changeTitle)];
As you can guess from the title, this button press enacts an innocuous title change, but it would be easy to redraw your table list or even to integrate that button with the navigation itself, perhaps using it as a Home button. At this point, you have a navigation controller that does precisely nothing (other than showing a gray bar with a title) and perhaps a working button. Unlike with the other controllers you ve met so far, you ll need to do some runtime work to get your navigation controller operating.
Using your navigation controller
A navigation controller has one core job: to allow a user to move up and down through a hierarchy of pages.
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The navigation controller
NAVIGATING FORWARD
To allow a user to navigate to a page deeper in your hierarchy, you need to use the navigation controller s interface to push a new view controller on top of the navigation controller s stack, which then causes that new view controller s view to become the visible view in your program. This is shown in listing 7.3, which continues to expand on RootViewController.m.
Listing 7.3 Activating a navigation controller
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { UIViewController *colorController = [[UIViewController alloc] init]; colorController.title = [[tableView cellForRowAtIndexPath:indexPath].textLabel text]; colorController.view = [[UIView alloc] init]; colorController.view.backgroundColor = [[tableView cellForRowAtIndexPath:indexPath].textLabel textColor]; [self.navigationController pushViewController:colorController animated:YES]; [colorController release]; }
To navigate using tables, you must modify the table view controller s tableView:didSelectRowAtIndexPath: method, which you first met in chapter 5. Clearly, if you re activating your navigation controller by some other method, you ll use different means. When a user selects an item that should lead them to the next page, you have to create the page they ll go to. You start by creating a view controller. Remember to set title, because it will be the title that appears in your new view controller s navigation item. Matching the title to the table cell s text is a common way to set this property. After you ve created a view controller, you need to decide how to create its default view. Here, you create a plain view. Prefer to create your view in Interface Builder No problem. Use the initWithNibName: method when you create your view controller, as we discussed in chapter 4. Each view should have different content based on what the user selects. Here, you look at the color of the table cell s text and then set the whole view to that color. More often, you ll probably look up an NSDictionary element from the same array you used to fill in your table and use that information to generate a unique page. For example, it d be easy to pull a nib name out of a dictionary. After you ve set up your new page, you send a message to the navigation controller to switch over to it. Note that you can find a reference to your navigation controller by using the view controller s navigationController property, another of many object links available in the view controller. The push command is simple: it adds a new page to the top of the navigation controller s stack and sends your user over to it.
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