The document discusses the importance of maintaining smaller, manageable view controllers in iOS development. It details the lifecycle methods of UIViewController and provides guidelines for creating maintainable code structures. Examples of initialization, view loading, and memory management are included to illustrate best practices.

1. Avoiding oversized
view controllers
in iOS
Stewart Gleadow
Email:
sgleadow@thoughtworks.com
Twitter:
@stewgleadow

3. What makes a class
easy to maintain?

4. UIView
UIViewController
Model

6. What makes a
controller easy to
maintain?

9. UIViewController
- (id)init;
- (void)loadView;
- (void)viewDidLoad;
- (void)viewWillAppear:(BOOL);
- (void)viewDidAppear:(BOOL);
- (void)viewWillDisappear:(BOOL);
- (void)viewDidDisappear: (BOOL);
- (void)viewDidUnload;
- (void)dealloc;

10. UIViewController
- (id)init;
- (void)loadView;
- (void)viewDidLoad;
- (void)viewWillAppear:(BOOL);
- (void)viewDidAppear:(BOOL);
- (void)viewWillDisappear:(BOOL);
- (void)viewDidDisappear: (BOOL);
- (void)viewDidUnload;
- (void)dealloc;

11. UIViewController
- (id)init;
- (void)loadView;
- (void)viewDidLoad;
- (void)viewWillAppear:(BOOL);
- (void)viewDidAppear:(BOOL);
- (void)viewWillDisappear:(BOOL);
- (void)viewDidDisappear: (BOOL);
- (void)viewDidUnload;
- (void)dealloc;

13. - (id)init;
{
if ((self = [super init]))
{
// create data related objects
}
return self;
}
- (void)dealloc;
{
// release any data related objects
[super dealloc];
}

15. - (void)loadView;
{
[super loadView];
// create all your views
// assign delegates
}
- (void)viewDidUnload;
{
// release any view related
[super viewDidUnload];
}

17. @interface MatchViewController : UIViewController
<UITableViewDelegate,
UITableViewDataSource,
UIScrollViewDelegate,
TTModelDelegate,
...>

18. Coordinated Views
View One
View Two
View Three

19. Coordinator
- (id)init;
- (UIView *)view;
- (void)releaseView;
- (void)dealloc;

21. ViewController Coordinator
- (id)init; - (id)init;
- (void)loadView; - (UIView *)view;
- (void)viewDidLoad; - (void)releaseView;
- (void)viewWillAppear:(BOOL);
- (void)viewDidAppear:(BOOL); - (void)dealloc;
- (void)viewWillDisappear:(BOOL);
- (void)viewDidDisappear: (BOOL);
- (void)viewDidUnload;
- (void)dealloc;

22. ViewController Coordinator
- (id)init; - (id)init;
- (void)loadView; - (UIView *)view;
- (void)viewDidLoad; - (void)releaseView;
- (void)viewWillAppear:(BOOL);
- (void)viewDidAppear:(BOOL); - (void)dealloc;
- (void)viewWillDisappear:(BOOL);
- (void)viewDidDisappear: (BOOL);
- (void)viewDidUnload;
- (void)dealloc;

23. ViewController Coordinator
- (id)init; - (id)init;
- (void)loadView; - (UIView *)view;
- (void)viewDidLoad; - (void)releaseView;
- (void)viewWillAppear:(BOOL);
- (void)viewDidAppear:(BOOL); - (void)dealloc;
- (void)viewWillDisappear:(BOOL);
- (void)viewDidDisappear: (BOOL);
- (void)viewDidUnload;
- (void)dealloc;

24. Demo

25. Stewart Gleadow
Email:
sgleadow@thoughtworks.com
Twitter:
@stewgleadow