1. Quick
Start
to
iOS
Development
Jussi
Pohjolainen
Tampere
University
of
Applied
Sciences

2. Anatomy?

3. Anatomy
• Compiled
Code,
your's
and
framework's
• Nib
–
files:
UI-­‐elements
• Resources:
images,
sounds,
strings
• Info.plist
–
file:
app
configuraIon

4. info.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleDevelopmentRegion</key>
<string>English</string>
<key>CFBundleDisplayName</key>
<string>${PRODUCT_NAME}</string>
<key>CFBundleExecutable</key>
<string>${EXECUTABLE_NAME}</string>
<key>CFBundleIconFile</key>
<string></string>
<key>CFBundleIdentifier</key>
<string>com.yourcompany.${PRODUCT_NAME:rfc1034identifier}</string>
<key>CFBundleInfoDictionaryVersion</key>
<string>6.0</string>
<key>CFBundleName</key>
<string>${PRODUCT_NAME}</string>
<key>CFBundlePackageType</key>
<string>APPL</string>
<key>CFBundleSignature</key>
<string>????</string>
<key>CFBundleVersion</key>
<string>1.0</string>
<key>LSRequiresIPhoneOS</key>
<true/>
<key>NSMainNibFile</key>
<string>MainWindow</string>
</dict>
</plist>

5. Info.plist
in
Xcode

6. nib-­‐file?
• Interface
Builder
is
used
for
creaIng
Uis
• The
interface
is
stored
in
a
file
.n/xib
– .nib
=
Next
Interface
Builder
– .xib
=
new
version
(Interface
Builder
3)
of
nib
• The
xib
file
is
xml!
• By
conven)on,
refer
to
nib

7. nib-­‐file

8. nib
–
files
in
Interface
Builder

9. main.m
//
// main.m
// ExampleOfiPhoneApp
//
// Created by Jussi Pohjolainen on 22.3.2010.
// Copyright TAMK 2010. All rights reserved.
//
#import <UIKit/UIKit.h>
int main(int argc, char *argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int retVal = UIApplicationMain(argc, argv, nil, nil);
[pool release];
return retVal;
}

10. UIApplicaIonMain?
• Creates
instance
of
UIApplicaIon
• Scans
info.plist
• Opens
the
UI
–
file
(xib)
that
is
defined
in
info.plist
(mainwindow.xib)
• Connects
to
window
server
• Establishes
run
loop
• Calls
method's
from
it's
delegate

11. Life
Cycle

12. Design
PaYern:
DelegaIon
• One
object
sends
periodically
messages
to
another
object
specified
as
its
delegate
• Delegate
methods
are
grouped
together
with
protocol
(Java:
Interface)

13. Delegate?
• Xcode
project
template
has
provided
UIApplicaIonDelegate
for
you
• Can
implement:
- applicationDidFinishLaunching
- applicationWillTerminate
– applicationDidReceiveMemoryWarning
– ...

14. Delegate-­‐class
in
Hello
World
NSObject
HelloWorldAppDelegate
IBOutlet UIWindow* window;
UIApplicationDelegate
- applicationDidFinishLaunching
- applicationWillTerminate
- applicationDidReceiveMemoryWarning
- ...
- dealloc

15. Delegate
#import <UIKit/UIKit.h>
@interface HelloWorldAppDelegate : NSObject
<UIApplicationDelegate> {
UIWindow *window;
} What
is
this?
@property (nonatomic, retain) IBOutlet UIWindow
*window;
@end

16. Outlet?
• Outlet:
the
UI
widget
is
implemented
in
Interface
Builder!
• When
the
app
starts,
the
main
.nib
file
is
loaded
– MainWindow.xib
• This
file
contains
UIWindow
that
can
be
modified
via
the
Interface
Builder.

17. Delegate
classes
implementaIon
#import "HelloWorldAppDelegate.h"
@implementation HelloWorldAppDelegate
@synthesize window;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Override point for customization after application launch
[window makeKeyAndVisible];
}
- (void)dealloc {
[window release];
[super dealloc];
}
@end

18. Windows,
Views
• iPhone
app
has
usually
one
UIWindow
• UIWindow
can
consist
of
UIViews.
View
can
contain
another
UIViews
(UI-­‐elements)
• UIWindow
– UIView
• NSBuYon

19. Interface
Builder

20. Interface
Builder

21. In
Code
#import <UIKit/UIKit.h>
@interface HelloWorldAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
UITextField *mytextfield;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UITextField *mytextfield;
@end

22. Connect
the
Outlet
with
Interface
Builder

23. AcIons
• AcIons:
what
method
is
called
when
something
happens?

24. In
Code
#import <UIKit/UIKit.h>
@interface HelloWorldAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
UITextField *mytextfield;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UITextField *mytextfield;
- (IBAction) userClicked: (id) sender;
@end

25. In
Interface
Builder

26. In
Code
#import "HelloWorldAppDelegate.h"
@implementation HelloWorldAppDelegate
@synthesize window;
@synthesize mytextfield;
- (IBAction) userClicked: (id) sender
{
NSString* text = [mytextfield text];
NSLog(text);
}
...

27. In
Code:
Using
Alert
#import "HelloWorldAppDelegate.h"
@implementation HelloWorldAppDelegate
@synthesize window;
@synthesize mytextfield;
- (IBAction) userClicked: (id) sender
{
NSString* text = [mytextfield text];
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"Hello"
message:text
delegate:nil
cancelButtonTitle:@"Ok"
otherButtonTitles:nil];
[alert show];
[alert release];
}
...

28. Result