아이폰 앱 개발 팁(13) : Head First iPhone Development #4

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> Head First iPhone Development #4

Chapter 4. multiple views - A table with a view

The title of the main view

Setting the title for the main view of the app means that additional views will automatically have back buttons to get to the main view.

Display drink list

1. Declare the drink array. (.h file)
• NSMutableArray* drinks;
• @property ~
• @synthesize ~
2. Implement and populate the array. (viewDidLoad method at .m file)
• NSMutableArray* tmpArray = [[NSMutableArray alloc] initWithObjects:@"Firecracker", @"Lemon Drop", @"Mojito", nil];
3. Tell the table how many rows you have. (numberOfRowsInSection method at .m file)
• return [self.drinks count];
4. Populate the table cells. (cellForRowAtIndexPath method at .m file)
• cell.textLabel.text = [self.drinks objectAtIndex:indexPath.row];

Variable allocation

// 1st Method : Book

NSMutableArray* tmpArray = [[NSMutableArray alloc] initWithObjects:@"Firecracker", @"Lemon Drop", @"Mojito", nil];

self.drinks = tmpArray;

[tmpArray release];

// 2nd Method : MissFlash

self.drinks = [[NSMutableArray alloc] initWithObjects:@"Firecracker", @"Lemon Drop", @"Mojito", nil];

// 3rd Method : Book

NSString* path = [[NSBundle mainBundle] pathForResource:@"DrinkArray" ofType:@"plist"];

NSMutableArray *tmpArray = [[NSMutableArray alloc] initWithContentsOfFile:path];

self.drinks = tmpArray;

[tmpArray release];

Use the navigation controller to switch between views

• A view stack for moving between views
• A navigation bar for buttons and a title
• A navigation toolbar for view-specific buttons

Navigation controllers maintain a stack of views

• Use the tap notification in the table view delegate
• tableview:didSelectRowAtIndexPath

Instantiate a view controller like any other class

• [[DrinkDetailViewController alloc] initWithNibName:@"DrinkDetailViewController" bundle:nil];
• At RootViewController.m

#import "DrinkDetailViewController.h"

...

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    DrinkDetailViewController *drinkDetailViewController = [[DrinkDetailViewController alloc] initWithNibName:@"DrinkDetailViewController" bundle:nil];

    [self.navigationController pushViewController:drinkDetailViewController animated:YES];

    [drinkDetailViewController release];

}

Create a back button

When you added a title for the main view, the navigation controller kept track of that name as part of the view stack for navigation, and added a back button with the title in it automatically.

Debug process

1. First stop on your debugging adventure: the console (Run -> Console)
2. Interact with your application while it's running
3. And when it's about to stop running
4. Xcode supports you after your app breaks, too
5. The Xcode debugger shows you the state of your application (Shift-Commander-Y key)

아이패드 국내 출시를 기원합니다. :-)

Steve Jobs for Fortune magazine by tsevis