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Objective-C For Web Developers
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Addam Hardy
August 24, 2012
Programming
6
710
Objective-C For Web Developers
Talk given at TechFest Northwest Arkansas 2012
Addam Hardy
August 24, 2012
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Transcript
For Objective-C Web Developers Addam Hardy
@addamh this guy Ruby on Rails Javascript Developer iOS
None
web developer? it’s time to evolve
tablet sales to surpass desktop sales by 2015
demand supply
demand supply profit
None
the run down
strict superset of C Objective-C
strict superset of C compiled language Objective-C
strict superset of C compiled language object-oriented Objective-C
strict superset of C compiled language object-oriented dynamic Objective-C
strict superset of C compiled language object-oriented dynamic strictly typed
Objective-C
strict superset of C compiled language object-oriented dynamic strictly typed
smalltalk style messaging Objective-C
strict superset of C compiled language object-oriented dynamic strictly typed
smalltalk style messaging very verbose Objective-C
difficulties for web developers
C bummers
C compiling! so much time! bummers
C compiling! so much time! the dynamic-ness. sort of. bummers
C compiling! so much time! the dynamic-ness. sort of. asynchronous/threading
bummers
C compiling! so much time! the dynamic-ness. sort of. asynchronous/threading
memory management bummers
C compiling! so much time! the dynamic-ness. sort of. asynchronous/threading
memory management bummers
C compiling! so much time! the dynamic-ness. sort of. asynchronous/threading
memory management static typing bummers
C compiling! so much time! the dynamic-ness. sort of. asynchronous/threading
memory management static typing errors bummers
xcode
xcode
xcode
xcode
xcode
xcode
xcode
xcode
typing
typing Ruby PHP Objective-C $var = 21; $variable = “This
is a string”; var = 21 variable = “This is a string” (int) var = 21; NSString *variable = @“This is a string”;
typing C Primitives Common Classes char short long unsigned char
unsigned int int float double bool NSString NSNumber NSArray NSDictionary NSMutableArray NSMutableDictionary UIView UIButton id and 20,000 others..
header files implementation files wat?
headers / implementation class.h The public API for the class
@interface Student { NSNumber *age; NSString *name; } @end
headers / implementation class.h class.m The public API for the
class The instructions for the class @interface Student { NSNumber *age; NSString *name; } @end @implementation Student - (NSString *) name { } @end
creating classes
classes Ruby PHP class HelloWorld { // instance variables go
here // methods go here public function sayHI() { print("Hello World!”); } } class HelloWorld // instance variables go here // methods go here def sayHI puts "Hello World!” end end
classes Objective-C @interface HelloWorld { NSString *statement = @”This is
a string” } -(void) sayHI; @end
classes Ruby PHP class cat extends animal { public function
be_cute() { print("I am teh cute”); } } class cat < animal def be_cute puts "I am teh cute” end end
classes Objective-C @interface Cat : Animal <CuteMultipler> { } -(void)
beCute; @end
properties
properties @property (nonatomic, retain) NSString *title; @property (nonatomic, assign) int
number;
properties @synthesize title; @synthesize number; [object setTitle:@”This is my title”];
NSLog(@”%@”, [object title]);
object instantiation
object instantiation Ruby PHP include_once('HelloWorld.class.php'); $hw = new HelloWorld; $hw->sayHI;
require ‘HelloWorld’ hw = HelloWorld.new hw.sayHI
Objective-C #import <Foundation/Foundation.h> @interface HelloWorld : NSObject { } -
(void)sayHI; @end object instantiation header
Objective-C #import “HelloWorld.h” @implementation HelloWorld - (void)sayHI { NSLog(@”Hi.”); }
@end object instantiation header
Objective-C #import <Foundation/Foundation.h> #import "HelloWorld.h" int main (int argc, const
char * argv[]) { HelloWorld *hw = [[HelloWorld alloc] init]; [hw printHelloDate]; return 0; } object instantiation main.m
methods /selectors
methods / selectors Ruby PHP function buyItem(item) { $cart =
new ShoppingCart; $cart->purchase(item); } def buyItem(item) cart = ShoppingCart.new cart.purchase(item) end
Objective-C - (void)buyItem:(ItemObject*)item { ShoppingCart *cart = [[ShoppingCart alloc] init];
[cart purchase:item]; } methods / selectors
def addObserver(key_path, options, context) end methods / selectors
def addObserver(key_path, options, context) end methods / selectors addObserver(key_path, options,
context)
-(void) addObserverForKeyPath:(NSIndexPath*)indexPath WithOptions:(NSDictionary*)options AndContext:(void*) { } methods / selectors
-(void) addObserverForKeyPath:(NSIndexPath*)indexPath WithOptions:(NSDictionary*)options AndContext:(void*) { } methods / selectors [object
addObserverForKeyPath:indexPath WithOptions:options AndContext:nil]
common pitfalls
common pitfalls NSString *this = @”kitty”; NSString *that = @”kitty”;
if(this == that){ NSLog(@”This will not happen”); } if([this isEqualToString:that]){ NSLog(@”This will happen!”); } NO YES
common pitfalls @synthesize this; @synthesize that; @synthesize those; @synthesize this,
that, those; NO YES
common pitfalls @interface MyNewClass @end @interface MyNewClass : NSObject @end
NO YES
common pitfalls start writing implementation right away always declare methods
in header first then implement NO YES
just do it!
thanks!