The document discusses iOS application development. It provides details on view controllers, navigation controllers, tab bar controllers and their life cycles. It describes how to create and link view controllers to allow navigation between screens in an app. It also discusses customizing navigation bar buttons, titles and tab bar items. The key topics covered are view controller hierarchies, passing data between view controllers, and using navigation and tab bar controllers to structure app navigation and organization.

1. Разработка приложений
для iPhone и iPad
занятие #6

2. домашнее задание
• Шулюгин Владислав - 12
• Кабир Павел - 10
• Николенко Анастасия - 9
• Михаил Терентьев - 12
• Андрей Кузьминов - 9
• Николай Яковлев - 9
• Михаил Акулов - 15
• Павел Мусатов - 12

3. счет команд
• Букукаб = 9 + 6 = 15
• l-dendrology = 12 + 15 + 10 + 10 = 47
• iTeam = 12 + 9 + 12 + 10 = 43
• HPNG = 9 + 8 = 17
• Васёк&Эдуард = 8

4. View-based application
Жизненный цикл
ViewController
- (id)initWithNibName:(NSString *)nibName
bundle:(NSBundle *)bundle
- (void)viewDidLoad
- (void)viewWillAppear:(BOOL)animated
- (void)viewWillDisappear:(BOOL)animated
[[NSUserDefaults standartUserDefaults] setFloat: ForKey:];
[[NSUserDefaults standartUserDefaults] floatForKey:];
[[NSUserDefaults standartUserDefaults] synchonize];

5. вращение
- (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

6. как изменять позиции
при вращении?
ur View with Interface Builder
Interface Builder
w controller class
let
oller
Name:bundle:

7. UINavigationController
UINavigationController
UINavigationController
• Stack of view controllers
• Stack of • Navigation bar
view controllers
• Navigation bar
View Controller
View Controller
Navigation View Controller
Navigation Controller View Controller
Controller View Controller
View Controller
Thursday, January 28, 2010 5
Thursday, January 28, 2010 5

8. управление набором
ViewController
- (void)pushViewController:(UIViewController *)viewController
animated:(BOOL)animated;
!!!вызывается retain
- (UIViewController *)popViewControllerAnimated:(BOOL)animated;
pop обычно не вызывается, автоматически при нажатии ‘<-’

9. первый ViewController
- (void)applicationDidFinishLaunching
}
navController = [[UINavigationController alloc] init];
[navController pushViewController:firstViewController animated:NO];
[window addSubview:navController.view];
}

10. а как использовать?
- (void)someAction:(id)sender {
}
UIViewController *viewController = ...;
[self.navigationController pushViewController:viewControlle animated:YES];
}

11. посмотрим?
•New Window-Based app
•Новый ViewController с кнопкой
•NavigationController и FirstViewController в AppDelegate
•SecondViewController
•Cвойство title у ViewController

12. как связать все
ViewController?

13. как связать все
ViewController?
• Не стоит использовать глобальные
переменные или AppDelagate
• Что нужно на входе следующему
ViewController?

14. как связать все
ViewController?
Best Practices for Data Flow
• Не стоит использовать глобальные
• Figure out exactly what needs to be communicated
переменные или AppDelagate
• Define input parameters for your view controller
• Что нужно на входе следующему
ViewController?
Data
List Detail
Controller Controller
Thursday, January 28, 2010 16

15. как связать все
ViewController?
Best Practices for Data Flow
• Не стоит использовать глобальные
• Figure out exactly what needs to be communicated
переменные или AppDelagate
• Define input parameters for your view controller
• Что нужно на входе следующему
ViewController?
Data
List Detail
Controller Controller
• В обратную сторону - используя делегаты
(с помощью протоколов)
Thursday, January 28, 2010 16

16. Customizing Navigation
бонусы к навигации
• Buttons or custom controls
• Interact with the entire screen
Thursday, January 28, 2010 20

17. UINavigationTitle
• Содержится у любогоOwnership
Navigation Item ViewController
Left Bar
Button Item
View Controller Navigation Item Title View
Right Bar
Button Item

18. кнопки справа и слева
• UIBarButtonItem отображается сверху
• Отображает строку, изображение
• Target + Action (как и во всех кнопках)

19. создание
UIBarButtonItem
- (void)viewDidLoad {
UIBarButtonItem *fooButton = [[UIBarButtonItem alloc]
initWithTitle:@"Foo”
Text Bar Button Item style:UIBarButtonItemStyleBordered
target:self
action:@selector(foo:)];
self.navigationItem.leftBarButtonItem = fooButton;
[fooButton release];
- (void)viewDidLoad
{ }
UIBarButtonItem *fooButton = [[UIBarButtonItem alloc]
- (void)viewDidLoad {
initWithTitle:@"Foo”
System Bar Button Item UIBarButtonItem *addButton = [[UIBarButtonItem alloc]
style:UIBarButtonItemStyleBordered
initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
target:self
style:UIBarButtonItemStyleBordered
action:@selector(foo:)];
target:self
action:@selector(add:)];
self.navigationItem.leftBarButtonItem = fooButton;
[fooButton release]; self.navigationItem.rightBarButtonItem = addButton;
- (void)viewDidLoad [addButton release];
}
{ }
UIBarButtonItem *addButton = [[UIBarButtonItem alloc]

20. кнопка
редактирования
Edit/Done Button
•
• Very common pattern практика
реализованная
• Every view controller has one available
! Target/action already set up
self.navigationItem.leftBarButtonItem = self.editButtonItem;
self.navigationItem.leftBarButtonItem = self.editButtonItem;
// Called when the user toggles the edit/done button
- (void)setEditing:(BOOL)editing animated:(BOOL)animated
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
}
{
// Update appearance of views
}

21. Custom Title View вместо надписи
• Arbitrary view in place of the title
UISegmentedControl *segmentedControl = ...
self.navigationItem.titleView = segmentedControl;
[segmentedControl release];
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22. UITabBarController
UITabBarController
UITabBarController
• Array of view controllers
• Tab bar
• Array of view controllers
• Tab bar
View Controller
Tab Bar
View Controller
Controller
View Controller
Tab Bar
Controller
Thursday, January 28, 2010 32

23. используем
UITabBarController
- (void)applicationDidFinishLaunching
{
tabBarController = [[UITabBarController alloc] init];
NSArray *myViewControllers = [NSArray
arrayWithObjects:someViewController, nil];
tabBarController.viewControllers = myViewControllers;
[window addSubview:tabBarController.view];
}

24. добавляем картинку и
Creating Tab надпись
Bar Items
• Title and image
- (void)viewDidLoad
{
UITabBarItem *item = [[UITabBarItem alloc]
initWithTitle:@“Playlists”
image:[UIImage imageNamed:@“music.png”]
tag:0];
self.tabBarItem = item;
[item release];
}

25. стандартный набор
Creating Tab Bar Items
• System item
- (void)viewDidLoad
{
UITabBarItem *item = [[UITabBarItem alloc]
initWithTabBarSystemItem:
UITabBarSystemItemBookmarks
tag:0]
self.tabBarItem = item;
[item release];
}
Thursday, January 28, 2010 37

26. ollers
а если слишком
More View Controllers
• много?
b bar controller has too many a tab bar controller has too many
What happens when
y at once? view controllers to display at once?
! “More” tab bar item
displayed automatically
! User can navigate to
remaining view controllers

27. Tab Bar + Navigation Controllers
Multiple parallel hierarchies
Thursday, January 28, 2010 41

28. архитектура
Tab Bar + Navigation Controllers
Navigation
Controller View Controller
Navigation
Tab Bar Controller Controller View Controller
View Controller

29. домашка!

30. http://empatika.com
oleg.parinov@empatika.com