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Ariejan de Vroom • @ariejan • http://ariejan.net
 Kabisa • @kabisaict • http://kabisa.nl

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Ruby Ariejan de Vroom • @ariejan • http://ariejan.net
 Kabisa • @kabisaict • http://kabisa.nl

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Objective-C Ariejan de Vroom • @ariejan • http://ariejan.net
 Kabisa • @kabisaict • http://kabisa.nl

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… but why?

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A Short History Of
 Programming Languages

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The Influence of Smalltalk

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#('a' 'b' 'c' ) do:[:each | Transcript show: each. Transcript cr. ].

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Ruby Objective-C

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Dynamically Typed
 Object Oriented
 Programming Languages

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Dynamic Dispatching via Message Dispatching

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@post.publish @post.send(:publish)

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[post publish]; [post performSelector:@selector(publish)];

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Objective-C is a Super Set of C

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Objective-C is an Compiled Language

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Objective-C has Forward Declarations

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Objective-C has Macro’s

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Objective-C has Pointers

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Objective-C requires Manual Memory Management

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Objective-C has Threading

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Ruby is an Interpreted Language

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Ruby has Duck-Typing

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Ruby has No Pointers

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Ruby does not require Manual Memory Management

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Ruby does not require Manual Memory Management

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Ruby has a Garbage Collector

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Ruby has (broken) Threading

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Objective-C Cocoa AppKit FoundationKit Cocoa Touch AppKit FoundationKit Mac OS X App iOS App Programming Stack

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// ADVPerson.h ! #import #import "ADVDepartment.h" ! @interface ADVPerson : NSObject { } ! @property (copy, nonatomic) NSString *name; @property (strong, nonatomic) ADVDepartment *department; @property (readonly, nonatomic) NSNumber *salary; ! + (ADVPerson *)personWithRandomData; ! - (void)giveRaiseOf:(NSNumber)amount withReason:(NSString *)reason; ! @end

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// ADVPerson.h ! #import #import "ADVDepartment.h" ! @interface ADVPerson : NSObject { } ! @property (copy, nonatomic) NSString *name; @property (strong, nonatomic) ADVDepartment *department; @property (readonly, nonatomic) NSNumber *salary; ! + (ADVPerson *)personWithRandomData; ! - (void)giveRaiseOf:(NSNumber)amount withReason:(NSString *)reason; ! @end

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// ADVPerson.h ! #import #import "ADVDepartment.h" ! @interface ADVPerson : NSObject { } ! @property (copy, nonatomic) NSString *name; @property (strong, nonatomic) ADVDepartment *department; @property (readonly, nonatomic) NSNumber *salary; ! + (ADVPerson *)personWithRandomData; ! - (void)giveRaiseOf:(NSNumber)amount withReason:(NSString *)reason; ! @end

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// ADVPerson.h ! #import #import "ADVDepartment.h" ! @interface ADVPerson : NSObject { } ! @property (copy, nonatomic) NSString *name; @property (strong, nonatomic) ADVDepartment *department; @property (readonly, nonatomic) NSNumber *salary; ! + (ADVPerson *)personWithRandomData; ! - (void)giveRaiseOf:(NSNumber)amount withReason:(NSString *)reason; ! @end

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ADVPerson *person = [ADVPerson personWithRandomData]; [person giveRaiseOf:1000 withReason:@"For being awesome!"];

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// ADVPerson.m ! #import "ADVPerson.h" ! @interface ADVPerson () @end ! @implementation ADVPerson ! + (ADVPerson *)personWithRandomData { ADVPerson *person = [[ADVPerson alloc] init]; [person setName:@"John Doe"]; [person setDepartment:[ADVDepartment randomDepartment]]; [person giveRaiseOf:2000 withReason:@"Initial salary"]; return person; } ! - (void)giveRaiseOf:(NSNumber)amount withReason:(NSString *)reason { _salary = _salary + amount; NSLog(@"Raising salary to %@ because %@", _salary, reason); } ! @end

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// ADVPerson.m ! #import "ADVPerson.h" ! @interface ADVPerson () @end ! @implementation ADVPerson ! + (ADVPerson *)personWithRandomData { ADVPerson *person = [[ADVPerson alloc] init]; [person setName:@"John Doe"]; [person setDepartment:[ADVDepartment randomDepartment]]; [person giveRaiseOf:2000 withReason:@"Initial salary"]; return person; } ! - (void)giveRaiseOf:(NSNumber)amount withReason:(NSString *)reason { _salary = _salary + amount; NSLog(@"Raising salary to %@ because %@", _salary, reason); } ! @end

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// ADVPerson.m ! #import "ADVPerson.h" ! @interface ADVPerson () - (void)setSalary:(NSNumber)amount; @end ! @implementation ADVPerson ! + (ADVPerson *)personWithRandomData { ADVPerson *person = [[ADVPerson alloc] init]; [person setName:@"John Doe"]; [person setDepartment:[ADVDepartment randomDepartment]]; [person giveRaiseOf:2000 withReason:@"Initial salary"]; return person; } ! - (void)giveRaiseOf:(NSNumber)amount withReason:(NSString *)reason { [self setSalary:(_salary + amount)]; NSLog(@"Raising salary to %@ because %@", _salary, reason); } ! @end

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// NSString+Reverse.h @interface NSString (Reverse) { } - (NSString *)reverse; @end ! ! ! ! // NSString+Reverse.m @implementation NSString (Reverse) ! - (NSString *)reverse { // TODO: Implement this. } ! @end

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Memory ADVPerson *john = [ADVPerson personWithRandomData]; ! NSLog(@"Person: %@", john.name); // Person: John Doe The Stack john

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Memory ADVPerson *john = [ADVPerson personWithRandomData]; ! NSLog(@"Person: %@", john.name); // Person: John Doe ! ADVPerson *dick = john; The Stack john dick

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Memory ADVPerson *john = [ADVPerson personWithRandomData]; ! NSLog(@"Person: %@", john.name); // Person: John Doe ! ADVPerson *dick = john; [dick setName:@"Dick Doe”]; The Stack john dick

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Memory ADVPerson *john = [ADVPerson personWithRandomData]; ! NSLog(@"Person: %@", john.name); // Person: John Doe ! ADVPerson *dick = john; [dick setName:@"Dick Doe”]; ! NSLog(@"Person: %@", dick.name); // Person: Dick Doe The Stack john dick

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Memory ADVPerson *john = [ADVPerson personWithRandomData]; ! NSLog(@"Person: %@", john.name); // Person: John Doe ! ADVPerson *dick = john; [dick setName:@"Dick Doe”]; ! NSLog(@"Person: %@", dick.name); // Person: Dick Doe ! NSLog(@"Person: %@", john.name); // Person: Dick Doe The Stack john dick

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Mutable Immutable

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NSCopying NSMutableCopying

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Reference Counting

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NSString *s = [[NSString alloc] init]; // Ref count is 1

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NSString *s = [[NSString alloc] init]; // Ref count is 1 [s retain]; // Ref count is 2

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NSString *s = [[NSString alloc] init]; // Ref count is 1 [s retain]; // Ref count is 2 [s release]; // Ref count is 1 again

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NSString *s = [[NSString alloc] init]; // Ref count is 1 [s retain]; // Ref count is 2 [s release]; // Ref count is 1 again [s release]; // Ref count is 0

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NSString *s = [[NSString alloc] init]; // Ref count is 1 [s retain]; // Ref count is 2 [s release]; // Ref count is 1 again [s release]; // Ref count is 0 s = nil; // Remove our pointer

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NSString *s = [[NSString alloc] init]; // Ref count is 1 [s retain]; // Ref count is 2 [s release]; // Ref count is 1 again [s release]; // Ref count is 0 s = nil; // Remove our pointer ! ! NSString *s = [NSString stringWithString:@"Hello world"]; // Auto released! [s retain]; // To hang on to s

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NSString *s = [[NSString alloc] init]; // Ref count is 1 [s retain]; // Ref count is 2 [s release]; // Ref count is 1 again [s release]; // Ref count is 0 s = nil; // Remove our pointer ! ! NSString *s = [NSString stringWithString:@"Hello world"]; // Auto released! [s retain]; // To hang on to s ! ! - (NSString *)helloWorldString { NSString *s = [[NSString alloc] initWithString:@"Hello world!"]; return [s autorelease]; }

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ARC Automatic Reference Counting

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@property (strong, nonatomic) ADVDepartment *department; @property (weak, nonatomic) ADVPeopleManager *peopleManager;

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-fno-objc-arc

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// ADVPriceFetcher.h #include ! @interface ADVPriceFetcher : NSObject - (NSNumber *)fetchCurrentBitcoinPriceInEur; @end

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// ADVPriceFetcher.h #include ! @protocol ADVPriceFetcherDelegate - (void)fetchedCurrentBitcoinPriceInEur:(NSNumber *)price; @end ! @interface ADVPriceFetcher : NSObject - (void)fetchCurrentBitcoinPriceInEur; @end

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// ADVPriceFetcher.h #include ! @protocol ADVPriceFetcherDelegate - (void)fetchedCurrentBitcoinPriceInEur:(NSNumber *)price; @end ! @interface ADVPriceFetcher : NSObject @property (weak, nonatomic) id delegate; - (void)fetchCurrentBitcoinPriceInEur; @end

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// ADVMainViewController.h #import "ADVPriceFetcher.h" ! @interface ADVMainViewController : UIViewController @property (strong, nonatomic) ADVPriceFetcher *priceFetcher; - (IBAction)pushRefreshButton; @end

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// ADVMainViewController.m @implementation ADVMainViewController ! - (id)init { if ([super init]) { self.priceFetcher = [[ADVPriceFetcher alloc] init]; [self.priceFetcher setDelegate:self]; } return self; } ! - (IBAction)pushRefreshButton { [self.priceFetcher fetchCurrentBitcoinPriceInEur]; } ! - (void)fetchedCurrentBitcoinPriceInEur:(NSNumber *)price { NSLog(@"Fetch price: %@", price); } ! @end

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// ADVPriceFetcher.m #import "ADVPriceFetch.h" ! @implementation ADVPriceFetcher ! - (void)fetchCurrentBitcoinPriceInEur { // Work our networking magic. NSNumber *price = /* ... */ if (_delegate && [_delegate respondsToSelector:@selector(fetchedCurrentBitcoinPriceInEur:)]) { [delegate fetchedCurrentBitcoinPriceInEur:price]; } } ! @end

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@protocol ADVPriceFetcherDelegate - (void)fetchedCurrentBitcoinPriceInEur:(NSNumber *)price; ! @optional - (void)errorFetchingBitcoinPrice:(NSError *)error; ! @end

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var fetcher = new ADVNetworkFetcher(); fetcher.fetchCurrentBitcoinPriceInEur({ success: function(price) { // … } });

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- (IBAction)pushRefreshButton { [self.priceFetcher fetchCurrentBitcoinPriceInEur:^(NSNumber *price) { NSLog(@"Fetched price: %@", price) }]; }

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// ADVPriceFetcher.h #include @interface ADVPriceFetcher : NSObject - (void)fetchCurrentBitcoinPriceInEur:(void (^)(NSNumber *price)completed; @end ! ! // ADVPriceFetcher.m @implementation ADVPriceFetcher ! - (void)fetchCurrentBitcoinPriceInEur:(void (^)(NSNumber *price)completed { // Work our networking magic. NSNumber *price = /* ... */ completed(price); } @end

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Grand Central Dispatch

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NSNotificationCenter

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Xcode

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iTunes Connect

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http://developer.apple.com

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CocoaPods

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I learned.

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Mobile Design Is Really Hard™

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Mobile ≠ Web

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Think Different

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I made an app.

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Binary Deep http://aj.gs/binary-deep

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Binary Deep http://aj.gs/binary-deep