Agile Iphone Development

Garage Days Return: Agile iPhone Development

Do you remember this?

A kid with a good idea...

Manic Miner

The big guys...

But...

These changed the rules...

What do you need to start?

An iPhone...

But...

OMG It’s ObjectiveC!

Bigino ObjectiveC

Smalltalk

Classes: declaration #import <Cocoa/Cocoa.h> @interface Photo : NSObject { NSString* caption; NSString* photographer; } - (NSString*) caption; - (NSString*) photographer; - (void) setCaption: (NSString*)input; - (void) setPhotographer: (NSString*)input; @end

Classes: implementation #import "Photo.h" @implementation Photo // ... - (NSString*) caption { return caption; } - (NSString*) photographer { return photographer; } @end

Method Invocation photo = [[Photo alloc] init]; [photo setCaption:@"Day at the Beach"]; output = [photo caption];

First Reaction

The Same in Java photo = new Photo(); photo.setCaption("Day at the Beach"); output = photo.caption();

In ObjectiveC photo = [[Photo alloc] init]; [photo setCaption:@"Day at the Beach"]; output = [photo caption];

Message Passing [obj method:parameter];

Multiple Parameters - (void)insertObject:(id)anObject atIndex:(NSUInteger)index; //... [array insertObject:@"Hello, World!" atIndex:5];

If you want... - (void)insertObject:(id)anObject :(NSUInteger)index; //... [array insertObject:@"Hello, World!" :5];

Dynamic Invocation (id)anObject = [ factory getFor:par1 ] [array foo]; [array bar];

No garbage collection!

Counter based

message counter alloc +1 copy +1 retain +1 release -1 autorelease -1

If you’ll use an object take ownership retain

If you own an object should release it release

If you alloc or copy an object you own it release

Collections take ownership

- (void)printHello { NSString *string; string = [[NSString alloc] initWithString:@"Hello"]; NSLog(string); [string release]; }

- (void)printHello { NSString *string; string = [NSString stringWithFormat:@"Hello"]; NSLog(string); }

- (void)printWindowTitle { NSString *string; string = [myWindow title]; NSLog(string); }

NSMutableArray *array; NSUInteger i; // ... for (i = 0; i < 10; i++) { NSNumber *allocedNumber = [[NSNumber alloc] initWithInteger: i]; [array addObject:allocedNumber]; [allocedNumber release]; }

Be Careful!

What about the tests?

Unit Tests...

Former SenTestingKit OCUnit

TestCase Definition #import <SenTestingKit/SenTestingKit.h> #import "RpnCalculator.h" @interface RpnCalculatorTestCase : SenTestCase { RpnCalculator* rpnCalculator; } @end

TestCase Implementation @implementation RpnCalculatorTestCase -(void)setUp{ rpnCalculator = [[RpnCalculator alloc]init]; } -(void)tearDown{ [rpnCalculator release]; } -(void)testShouldDisplayTwoNumbersWhenNumbersAreSeparatedByEnter{ [rpnCalculator put:@"1"]; [rpnCalculator put:@"enter"]; [rpnCalculator put:@"2"]; STAssertEqualObjects(@"1n2",rpnCalculator.display,nil); }

TestCase Implementation #define STAssertNil(a1, description, ...) #define STAssertNotNil(a1, description, ...) #define STAssertTrue(expression, description, ...) #define STAssertFalse(expression, description, ...) #define STAssertEqualObjects(a1, a2, description, ...) #define STAssertEquals(a1, a2, description, ...) #define STFail(description, ...) #define STAssertTrueNoThrow(expression, description, ...) #define STAssertFalseNoThrow(expression, description, ...) //....

XCode Integration

XCode in a Nutshell

Useful Shortcuts Esc - Name Completion

Useful Shortcuts ⌘S - Save

Useful Shortcuts ⌘B - Build

Useful Shortcuts ⌥⌘↑ - HeaderSource

Conclusions

The Market Asks For Apps

More Apps...

More Apps!

Lot to Improve

Be Good Kids:

Test First!

Questions?

Coding Dojo Rules

Randori

Silence

Suggest

KataRpnCalculator

20 5 / => (20/5) = 4 4 2 + 3 - => (4+2)-3 = 3 3 5 8 * 7 + * => 3*((5*8)+7) = 141

Let’s Start!

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Agile Iphone Development

by giordano scalzo on Mar 29, 2010

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Agile Iphone Development — Presentation Transcript