The document discusses iPhone app development using Objective-C. It covers the basics of getting started, including what is needed to begin like a Mac, Xcode, and an iPhone. It then explains key Objective-C concepts like classes, methods, and memory management using retain counts. The document also discusses unit testing iOS apps using OCUnit and some Xcode tips. It emphasizes testing first and concludes by noting the market demands more apps and there is room for improvement.

1. Garage Days Return:
Agile iPhone Development

2. Do you remember this?

3. Do you remember this?

4. Do you remember this?

5. A kid with a good idea...

6. Manic Miner

7. The big guys...

8. But...

9. These changed the rules...

10. What do you need to
start?

11. A Mac

12. XCode

13. An iPhone...

14. Books

15. But...

16. OMG It’s ObjectiveC!

17. Bigino ObjectiveC

18. Smalltalk

19. C

20. 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

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

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

23. First Reaction

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

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

26. Message Passing
[obj method:parameter];

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

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

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

30. No garbage collection!

31. Counter based

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

33. If you’ll use an object
take ownership
retain

34. If you own an object
should release it
release

35. If you alloc or copy an object
you own it
release

36. Collections take ownership

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

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

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

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

41. Be Careful!

42. What about the tests?

43. Unit Tests...

44. Former SenTestingKit
OCUnit

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

46. 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);
}

47. 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, ...)
//....

48. XCode Integration

49. XCode Integration

50. XCode in a Nutshell

55. Useful Shortcuts
Esc - Name Completion

56. Useful Shortcuts
⌘S - Save

57. Useful Shortcuts
⌘B - Build

58. Useful Shortcuts
⌥⌘↑ - HeaderSource

59. Conclusions

60. The Market Asks For Apps

61. The Market Asks For Apps

62. More Apps...

63. More Apps...

64. More Apps!

65. Lot to Improve

66. Be Good Kids:

67. Test First!

69. Questions?

70. Coding Dojo Rules

71. Randori

72. Silence

73. Suggest

74. KataRpnCalculator

75. 20 5 / => (20/5) = 4
4 2 + 3 - => (4+2)-3 = 3
3 5 8 * 7 + * => 3*((5*8)+7) = 141

76. Let’s Start!