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CS 646 Mobile Application DevelopmentFall Semester, 2011
Doc 15 Nib files and ControllersOct 18, 2011
Copyright ©, All rights reserved. 2011 SDSU & Roger Whitney, 5500 Campanile Drive, San Diego, CA 92182-7700 USA. OpenContent (http://www.opencontent.org/openpub/) license defines the copyright on this document.
Tuesday, October 18, 11
Basic Setup
2
UIApplicationDelegate
View
Controller
Model
OS
Your Code
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Nib files
3
nib - NeXT Interface Builderxib - Xml Interface Builder
Interface Builder started in 1988One of first commercial GUI builderDoes not generate GUI codeGenerates description of GUI codeDescription stored in nib file
only nib files until Interface builder 3.0
xibxml version of nib fileUsed during developmentConverted into nib file when deploying application
Documentation refers to xib and nib as nib file
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Freeze Dried
4
GUI elements are archived into nib file
Process also calledSerializationMarshalling
nib files are said to be freeze dried
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nib file contents
5
PlaceholdersNot known until runtimeFile's owenerFirst ResponderCan add more
ObjectsMainly views for displayDelegatesControllersImagesSound
Things are added by interface builderSerialized into nib file
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First Responder
6
GUI element that current receives most events first
Changes depending on which GUI has focus
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7
Responder Chain
Event is sent to view it occurs in
If it does not handle event it is passed on tosuper view (or controller)
Views and Controllers are responders
First responder is first thing in responder chain
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FileOwner
8
Controller
Connected to nib file when loading nib
[[FlipsideViewController alloc] initWithNibName:@"FlipsideViewController" bundle:nil]
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Loading Nib File
9
1. Load raw data nib file into memory
2. Unarchives objectsAll objects conforming to NSCoder protocol initialized with initWithCoder:
Includes subclasses ofUIViewUIViewController
3. Reestablish IBOutlets & IBActionsCalls setValue:forKey: to create IBOutlet connection
Calls addTarget:action:forControlEvents: to create IBAction connection
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Loading Nib File
10
4. Sends awakeFromNib to GUI elementsNot sent to placeholder objects
5. Displays any window whose "Visible at launch time" attribute was enabled in nib
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Connecting View to Controller
11
Preferred way
Hidden IBOutlet view in controller
[[FlipsideViewController alloc] initWithNibName:@"FlipsideViewController" bundle:nil]
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Controller displays its View
12
nib files contain a view
nib files are connected to a controller
A view from nib file is set as controller's view
Active controller displays it view
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Simple Example - One Nib, Two Views
13
@interface ViewController : UIViewController
- (IBAction)goRed;
@property (retain, nonatomic) IBOutlet UIView *red;
@end
@interface UIViewController : UIResponder
- (IBAction) view;
@end
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The Action
14
- (IBAction)goRed { self.view = self.red;}
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Xcode 4.2, Outlets & Actions
15
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Avoid large nib files
16
nib file contents are read into memory and processed before displaying view
Only add elements needed
Previous example did not need to display two view at same time
So place second view in separate nib file
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MainWindow.xib
17
ContainsDelegateController to use
Controller as own nib fileWindow
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Controller Occupies Entire Window
18
So controllers viewis all you see
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App Delegate has two Outlets
19
@class SwitchViewViewController;
@interface SwitchViewAppDelegate : NSObject <UIApplicationDelegate> {
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet SwitchViewViewController *viewController;
@end
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Putting our Controller in Charge
20
@implementation SwitchViewAppDelegate
@synthesize window=_window;
@synthesize viewController=_viewController;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{ self.window.rootViewController = self.viewController; [self.window makeKeyAndVisible]; return YES;}
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window.rootViewController
21
root view controller provides the content view of the window
Changing root view controller changes the view
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MainWindow.xib
22
Creates window
Gives app delegatewindowcontroller to use
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Xcode 4.2 and MainWindow.xib
23
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{ self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease]; self.mainViewController = [[[MainViewController alloc] initWithNibName:@"MainViewController"
bundle:nil] autorelease]; self.window.rootViewController = self.mainViewController; [self.window makeKeyAndVisible]; return YES;}
Does not use MainWindow.xib
Just create UIWindow in code
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24
How to Move to Different Screen
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Ways of changing to different Screen
25
root view controller
Controllers designed to show different viewsTab view controllerNavigation controllerPage controllerModal change
Change subviews
Story Boarding (Xcode 4.2)
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rootViewController
26
Changing root view controller changes the view displayed
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Controllers designed to change Views
27
Tab view controllerEach tab has own controllerSelecting tab shows view of tab's controller
Navigation controller Maintains stack of controllersPushing controller on stack displays that controller's view
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But how does that work?
28
View can contain subviews
Can change the subview
[blueViewController.view removeFromSuperview];[self.view insertSubview:yellowViewController.view atIndex:0];
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Utility app and Modal Change
29
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Utility app and Modal Change
30
MyViewController *controller = [[[MyFlipsideViewController alloc] initWithNibName:@"MyViewController" bundle:nil] autorelease];
controller.delegate = self;controller.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:controller animated:YES];
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Storyboarding
31
New in Xcode 4.2
Don't use xib files
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