Short presentation talking about Objective C and iPhone development about 6 weeks after I started

1. An Introduction
iPhone Programming
Stewart Gleadow, Thoughtworks

2. Barriers to Entry
• Objective C
• I can’t see my code for all the square brackets
• Development Tools
• I survived XCode and lived to tell the tale
• Real Software?
• Only people that don’t know how to program write iPhone Apps?

3. Learning the Hard Way
• Memory Model
• Get your memory management right the first time
• Frameworks
• Don’t fight the framework
• View Lifecycles

4. User Interfaces
• Interface Builder
• Hand-rolled Controllers
• NavigationController, TabController
• UIViewController subclasses
• UIView subclasses

5. Testing
• Unit Testing
• OCUnit, GTM Test, GHUnit
• OCMock
• Not on the iPhone?
• Functional Testing
• Instruments & UIAutomation
• Manual Testing

6. iPhone Concerns
• Persistence
• Performance
• Multiple Resolutions
• Network Dropouts

7. Header
@class ExtraClass;
@interface SomeClass : NSObject
{
ExtraClass *extraClass_;
}
+ (NSString *)classLevelMethod;
- (id)initWithExtraClass:(ExtraClass *)extraClass;
@property (nonatomic, retain) ExtraClass *extraClass;
@end

8. Implementation
#import “SomeClass.h”
#import “ExtraClass.h”
@interface SomeClass ()
@end
@implementation SomeClass
- (id)initWithExtraClass:(ExtraClass *)extraClass; {
if (self = [super init]) {
[self setExtraClass:extraClass];
}
return self;
}
-(void)dealloc; {
[extraClass_ release];
}
@synthesize extraClass = extraClass_;
@end

9. Using your Class
ExtraClass *extraClass = [ExtraClass defaultExtraClass];
SomeClass *someClass =
[[SomeClass alloc] initWithExtraClass:extraClass];
// do some stuff with your class
ExtraClass *fromAccessor = [someClass extraClass];
[someClass release];
someClass = nil;

10. Looking Forward
• Barriers to entry are more like hurdles
• Objective C is not as bad as I thought
• XCode 4 to save the day?
• Don’t give up on testing

11. Demo