1. Patterns & Techniques
For Cross-Platform
Objective-C Code
Graham Lee
Smartphone Security Boffin, O2
@iamleeg

5. http://www.levenez.com/unix

6. http://www.levenez.com/unix

13. @interface O2LPerson : NSObject
- (id)init;
- (NSString *)name;
- (NSArray *)phoneNumbers;
// …
@end

14. @interface O2LPerson : NSObject
- (id)init;
- (NSString *)name;
- (NSArray *)phoneNumbers;
// …
@end
@implementation O2LPerson {
@private
O2LPersonStrategy *personStrategy;
}
- (NSString *)name {return [personStrategy name];}
- (NSArray *)phoneNumbers {return [personStrategy
phoneNumbers];}
// …
@end

15. @interface O2LPerson : NSObject
- (id)init;
- (NSString *)name;
- (NSArray *)phoneNumbers;
// …
@end
@implementation O2LPerson {
@private
O2LPersonStrategy *personStrategy;
}
- (NSString *)name {return [personStrategy name];}
- (NSArray *)phoneNumbers {return [personStrategy
phoneNumbers];}
// …
@end
@interface O2LPersonStrategyMac
@interface O2LPersonStrategyiOS

16. @interface O2LPerson : NSObject
- (id)init;
- (NSString *)name;
- (NSArray *)phoneNumbers;
// …
@end
@implementation O2LPerson {
@private
O2LPersonStrategy *personStrategy;
}
- (NSString *)name {return [personStrategy name];}
- (NSArray *)phoneNumbers {return [personStrategy
phoneNumbers];}
// …
@end
@interface O2LPersonStrategyMac
@interface O2LPersonStrategyiOS
@interface O2LPersonStrategyLiveConnect

17. @interface O2LPerson : NSObject
- (id)init;
- (NSString *)name;
- (NSArray *)phoneNumbers;
// …
@end
@implementation O2LPerson
- (id)init {
[self release]; self = nil;
if (iOS) return [[O2LPersoniOS alloc] init];
else if (mac) return [[O2LPersonMac alloc] init];
//…
}
- (NSString *)name {[self subclassResponsibility: _cmd];}
// …
@end

19. [frameworkObject hasShinyFeature]
[frameworkObject respondsToSelector:]

20. [frameworkObject hasShinyFeature]
[frameworkObject respondsToSelector:]
NSClassFromString(@”ShinyClass”)

21. [frameworkObject hasShinyFeature]
[frameworkObject respondsToSelector:]
NSClassFromString(@”ShinyClass”)
[ShinyClass class] != nil

22. [frameworkObject hasShinyFeature]
[frameworkObject respondsToSelector:]
NSClassFromString(@”ShinyClass”)
[ShinyClass class] != nil
dlopen(”shiny.dylib”, RTLD_LAZY) != NULL

23. [frameworkObject hasShinyFeature]
[frameworkObject respondsToSelector:]
NSClassFromString(@”ShinyClass”)
[ShinyClass class] != nil
dlopen(”shiny.dylib”, RTLD_LAZY) != NULL
#ifdef SHINYFEATURE

30. …

31. …
include $(GNUSTEP_MAKEFILES)/common.make
PACKAGE_NAME = GFractal
VERSION = 0.1
# The application to be compiled
APP_NAME = GFractal
# The Objective-C source files to be compiled
GFractal_OBJC_FILES = main.m
Controller.m
FractalView.m
FractalWindow.m
# The Resource files to be copied into the app's resources directory
GFractal_RESOURCE_FILES = Icons/*
include $(GNUSTEP_MAKEFILES)/application.make

38. “Be excellent to each other”
Graham Lee
Smartphone Security Boffin, O2
@iamleeg