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For
Objective-C
Web Developers
Addam Hardy
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@addamh
this guy
Ruby on Rails
Javascript
Developer
iOS
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No content
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web developer?
it’s time to evolve
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tablet sales to surpass desktop sales by 2015
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demand
supply
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demand
supply
profit
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the run down
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strict superset of C
Objective-C
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strict superset of C
compiled language
Objective-C
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strict superset of C
compiled language
object-oriented
Objective-C
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strict superset of C
compiled language
object-oriented
dynamic
Objective-C
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strict superset of C
compiled language
object-oriented
dynamic
strictly typed
Objective-C
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strict superset of C
compiled language
object-oriented
dynamic
strictly typed
smalltalk style messaging
Objective-C
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strict superset of C
compiled language
object-oriented
dynamic
strictly typed
smalltalk style messaging
very verbose
Objective-C
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difficulties for
web developers
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C
bummers
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C
compiling! so much time!
bummers
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C
compiling! so much time!
the dynamic-ness. sort of.
bummers
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C
compiling! so much time!
the dynamic-ness. sort of.
asynchronous/threading
bummers
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C
compiling! so much time!
the dynamic-ness. sort of.
asynchronous/threading
memory management
bummers
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C
compiling! so much time!
the dynamic-ness. sort of.
asynchronous/threading
memory management
bummers
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C
compiling! so much time!
the dynamic-ness. sort of.
asynchronous/threading
memory management
static typing
bummers
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C
compiling! so much time!
the dynamic-ness. sort of.
asynchronous/threading
memory management
static typing
errors
bummers
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xcode
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xcode
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xcode
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xcode
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xcode
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xcode
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xcode
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xcode
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typing
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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”;
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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..
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header files
implementation files
wat?
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headers / implementation
class.h
The public API for the class
@interface Student {
NSNumber *age;
NSString *name;
}
@end
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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
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creating classes
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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
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classes
Objective-C
@interface HelloWorld
{
NSString *statement = @”This is a string”
}
-(void) sayHI;
@end
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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
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classes
Objective-C
@interface Cat : Animal {
}
-(void) beCute;
@end
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properties
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properties
@property (nonatomic, retain) NSString *title;
@property (nonatomic, assign) int number;
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properties
@synthesize title;
@synthesize number;
[object setTitle:@”This is my title”];
NSLog(@”%@”, [object title]);
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object instantiation
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object instantiation
Ruby
PHP
include_once('HelloWorld.class.php');
$hw = new HelloWorld;
$hw->sayHI;
require ‘HelloWorld’
hw = HelloWorld.new
hw.sayHI
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Objective-C
#import
@interface HelloWorld : NSObject {
}
- (void)sayHI;
@end
object instantiation
header
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Objective-C
#import “HelloWorld.h”
@implementation HelloWorld
- (void)sayHI {
NSLog(@”Hi.”);
}
@end
object instantiation
header
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Objective-C
#import
#import "HelloWorld.h"
int main (int argc, const char * argv[]) {
HelloWorld *hw = [[HelloWorld alloc] init];
[hw printHelloDate];
return 0;
}
object instantiation
main.m
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methods
/selectors
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methods / selectors
Ruby
PHP
function buyItem(item)
{
$cart = new ShoppingCart;
$cart->purchase(item);
}
def buyItem(item)
cart = ShoppingCart.new
cart.purchase(item)
end
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Objective-C
- (void)buyItem:(ItemObject*)item {
ShoppingCart *cart = [[ShoppingCart alloc] init];
[cart purchase:item];
}
methods / selectors
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def addObserver(key_path, options, context)
end
methods / selectors
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def addObserver(key_path, options, context)
end
methods / selectors
addObserver(key_path, options, context)
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-(void) addObserverForKeyPath:(NSIndexPath*)indexPath
WithOptions:(NSDictionary*)options
AndContext:(void*) {
}
methods / selectors
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-(void) addObserverForKeyPath:(NSIndexPath*)indexPath
WithOptions:(NSDictionary*)options
AndContext:(void*) {
}
methods / selectors
[object addObserverForKeyPath:indexPath WithOptions:options AndContext:nil]
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common pitfalls
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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
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common pitfalls
@synthesize this;
@synthesize that;
@synthesize those;
@synthesize this, that, those;
NO
YES
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common pitfalls
@interface MyNewClass
@end
@interface MyNewClass : NSObject
@end
NO
YES
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common pitfalls
start writing implementation right away
always declare methods in header first then implement
NO
YES
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just do it!
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thanks!