vb.net print barcode labels Data: actions, preferences, and files in Objective-C

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Data: actions, preferences, and files
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Of the two, the latter is the Apple-preferred way of doing things, but we ll touch on both, starting with creating your own preferences page. You should feel free to use either method, based on the needs of your program; but you should most definitely not mix the two styles of preferences, because that s likely to be confusing for your users.
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Creating your own preferences
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You ll typically use this method of creating preferences when your application has more than basic data to store. For example, if one of your application settings is a user photo, you can t store this type of information in the built-in system settings. You need a custom interface to allow the user to pick a photo from their library. Whenever you re writing apps, you should always do your best to match the look, feel, and methodology of Apple s existing programs. Looking through built-in programs can offer lessons about when and how to use personal preferences on your own. Here s what the personal preferences of those built-in programs can tell you: They re used infrequently. When they do appear, they re used in conjunction with a program that has only a single page of content (like Stocks) or one that has multiple identical pages of content (like Weather). They appear on the backside of a flipside controller. The preferences appear in a special list view that includes cells. You can easily accommodate these standards when building your own programs. You ll do so over the next few examples, with the goal being to create the simple preferences table shown in figure 8.1.
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DRAWING THE PREFERENCES PAGE
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If you re going to create a program that has built-in preferences, you should do so using the Utility Application template. As you ve previously seen, this will give you access to a flipside controller, which will allow you to create your preferences on the backside of your application. To create the special cartouched list used by preferences, you must create a table view controller with the special UITableViewGrouped style. You can do this by choosing the Grouped style for your table view in Interface Builder or by using the initWithStyle: method in Xcode. The following code shows the latter method by creating the UITableViewController subclass (here called a PreferencesController) inside the flipside controller s viewDidLoad method:
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- (void)viewDidLoad { PreferencesController *myTableView = [[PreferencesController alloc] initWithStyle:UITableViewStyleGrouped]; [self.view addSubview:myTableView.view]; }
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After you ve done this, you can fill in your PreferencesController s table view using the methods described in chapter 5. You ll probably use the cells accessoryView
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Maintaining user preferences
Figure 8.1 This preferences page was built from scratch on the backside of a flipside controller.
property, because you ll want to add switches and other objects to the preference listing. Listing 8.1 shows the most important methods required to create a simple preferences page with two switches.
Listing 8.1 Following the table view methods to fill out your preferences table
- (id)initWithStyle:(UITableViewStyle)style { if (self = [super initWithStyle:style]) { settingsList = [NSArray arrayWithObjects: [NSMutableDictionary dictionaryWithObjectsAndKeys: @"Sounds",@"titleValue", @"switch",@"accessoryValue", [NSNumber numberWithBool:YES], @"prefValue", @"setSounds:",@"targetValue",nil], [NSMutableDictionary dictionaryWithObjectsAndKeys: @"Music",@"titleValue", @"switch",@"accessoryValue", [NSNumber numberWithBool:YES],@"prefValue", @"setMusic:",@"targetValue",nil],nil]; [settingsList retain]; switchList = [NSMutableArray arrayWithCapacity:settingsList.count]; for (int i = 0 ;
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Data: actions, preferences, and files
i < [settingsList count] ; i++) { if ([[[settingsList objectAtIndex:i] objectForKey:@"accessoryValue"] compare:@"switch"] == NSOrderedSame) { UISwitch *mySwitch = [[[UISwitch alloc] initWithFrame:CGRectZero] autorelease]; mySwitch.on = [[[settingsList objectAtIndex:i] Prepares objectForKey:@"prefValue"] boolValue]; switch array [mySwitch addTarget:self action:NSSelectorFromString([[settingsList objectAtIndex:i] objectForKey:@"targetValue"]) forControlEvents:UIControlEventValueChanged]; [switchList insertObject:mySwitch atIndex:i]; } else { [switchList insertObject:@"" atIndex:i]; } } Moves [switchList retain]; table down CGPoint tableCenter = self.view.center; self.view.center = CGPointMake(tableCenter.x,tableCenter.y+22);
} return self; } - (NSInteger)numberOfSectionsInTableView: (UITableView *)tableView { return 1; } - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { return @"Audio Preferences"; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return settingsList.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { Creates cells static NSString *MyIdentifier = @"MyIdentifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:MyIdentifier] autorelease]; } cell.textLabel.text = [[settingsList objectAtIndex:indexPath.row] objectForKey:@"titleValue"]; if ([switchList objectAtIndex:indexPath.row]) { cell.accessoryView = Puts switch in [switchList accessory view objectAtIndex:indexPath.row]; } return cell; }
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