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Reactive Cocoa e MVVM
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Guilherme Martinez Sampaio
October 30, 2014
Programming
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Reactive Cocoa e MVVM
Palestra dada no CocoaHeads CPS Outubro/2013
Guilherme Martinez Sampaio
October 30, 2014
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Transcript
INTRODUÇÃO A REACTIVE FUNCTIONAL PROGRAMMING. by Guilherme Martinez Sampaio
Guilherme Martinez Sampaio iOS Developer @gsampaio
None
None
Agenda ▸ Functional Reactive Programming ▸ Reactive Cocoa ▸ Model
View View Model ▸ Demo ▸ Referências
FUNCTIONAL REACTIVE PROGRAMMING?
None
FUNCTIONAL REACTIVE PROGRAMMING IS A PROGRAMMING PARADIGM FOR reactive programming
USING THE BUILDING BLOCKS OF functional programming.
FRP HAS BEEN USED FOR PROGRAMMING GUI, ROBOTICS, AND MUSIC,
AIMING TO SIMPLIFY THESE PROBLEMS BY EXPLICITLY modeling time.
EM OUTRAS PALAVRAS DESCREVEMOS NOSSOS PROGRAMAS COMO EVENTOS QUE REAGEM
COM o tempo
Reactive Cocoa
RAC É FORTEMENTE BASEADA NO RXEXTENSIONS DA MICROSOFT PARA .NET
RAC SE BASEIA EM Signals E Sequences
AO INVÉS DE USAR variáveis QUE SÃO ALTERADAS USAMOS sinais
QUE CAPTURA O valor atual E valores futuros.
SINAIS FUNCIONAM COMO Promises
SINAIS TEM subscribers QUE ESCUTAM SUAS ALTERAÇÕES
SUBSCRIBERS RECEBEM 3 eventos
NEXT
COMPLETED
ERROR
RACSIGNAL __block NSUInteger subscribers = 0; RACSignal *signal = [RACSignal
createSignal:^ RACDisposable * (id<RACSubscriber> subscriber) { subscribers++; [subscriber sendNext:@(subscribers)]; [subscriber sendCompleted]; return nil; }]; [signal subscribeNext:^(id x) { NSLog(@"%@", x) } error:^(NSError *error) { NSLog(@"ERRO !"); } completed:^{ NSLog(@"Signal completo"); }] /** Output: 1 Signal completo **/
SINAIS SÃO EXECUTADOS A A PARTIR DO MOMENTO QUE ELE
TEM UM subscriber ATÉ ELE ENVIAR UM SINAL DE completed
SINAIS PODEM TER VÁRIOS subscribers
PODEMOS COMPOR SINAIS USANDO programação funcional
RACSIGNAL __block NSUInteger subscribers = 2; RACSignal *signal = [RACSignal
createSignal:^ RACDisposable * (id<RACSubscriber> subscriber) { subscribers++; [subscriber sendNext:@(subscribers)]; [subscriber sendCompleted]; return nil; }]; RACSignal *powSingal = [signal map:^NSNumber(NSNumber *value){ NSUInteger intValue = [value unsignedIntegerValue]; return @(intValue * intValue); }]; [signal subscribeNext:^(id x) { NSLog(@"VALUE: %@", x); }]; /** Outputs: 9 **/
COLLECTIONS PODEM GERAR RACSequence QUE POR SUA VEZ PODEMOS USAR
APLICAR Programação Funcional
RACSEQUENCE NSArray *lettersArray = [@"A B C D E F
G H I" componentsSeparatedByString:@" "]; RACSignal *letters = lettersArray.rac_sequence.signal; [letters subscribeNext:^(NSString *x) { NSLog(@"%@", x); }]; /** Outputs: A B C D E F G H I **/
RACSEQUENCE RACSignal *numbers = [@[@(1), @(2), @(3)].rac_sequence.signal; RACSignal *pow =
[numbers map:^NSNumber*(NSNumber *value){ NSUInteger intValue = [value unsignedIntegerValue]; return @(intValue * intValue); }]; [pow subscribeNext:^(NSNumber *value) { NSLog(@"%@", value); }]; /** Outputs: 1 4 9 **/
RAC CONTEM MACROS PARA FAZER data-binding
RAC() @interface ViewController () @property(nonatomic) NSUInteger *foo; @property(nonatomic) NSUInteger *bar;
@end @implementation ViewController - (void)viewDidLoad { self.foo = 0; self.bar = 0; NSLog(@"FOO: %@", @(self.foo)); RAC(self, foo) = RACObserve(self, bar); self.bar = 1; NSLog(@"FOO: %@", @(self.foo)); } @end /** Outputs: FOO: 0 FOO: 1 **/
MVVM
MODEL VIEW VIEW-MODEL É UM ARCHITECTURAL PATTERN SEMELHANTE AO MVC
MODEL VIEW CONTROLLER
MAS NA REALIDADE O QUE ACONTECE É QUE FICAMOS COM
view controllers gigantes
MODEL VIEW CONTROLLER
COM MVVM MOVEMOS A LÓGICA DE NEGOCIO TOTALMENTE FORA DO
VC
E TRATAMOS O VC COMO PARTE DA VIEW UMA VEZ
QUE ELE TRATA APRESENTAÇÃO, ROTAÇÃO E NAVEGAÇÃO.
MODEL VIEW VIEW-MODEL
PARA CADA VIEW CRIAMOS UM VIEW MODEL QUE TRATA ELA.
USAMOS DATA BINDING PARA FAZER COMUNICAÇÃO.
MODEL VIEW VIEW MODEL @interface ViewController () @property(nonatomic, strong) ViewModel
*viewModel; @property(nonatomic, weak) UITextField *textField; @property(nonatomic, weak) UILabel *label; @end @implementation ViewController - (void)viewDidLoad { RAC(self.viewModel, text) = [self.textField rac_textSignal]; RAC(self.label, text) = [self.viewModel expensiveComputation]; } @end
VIEW MODELS facilitam escrever testes de uma view. UMA VEZ
QUE TESTAMOS O COMPORTAMENTO DAS VIEWS AO INVÉS DA VIEW EM SI
VIEW MODELS PREGAM Composição sobre Herança.
FAZENDO COM QUE TENHAMOS UM CÓDIGO mais reaproveitável.
UMA VEZ QUE PODEMOS PLUGAR OS VIEW MODELS QUE QUEREMOS
NOS NOSSOS VC
COM ALGUMA EXCESSÕES VIEW MODELS SÃO independentes de plataforma.
DEMO
REFERÊNCIAS ▸ FRP - http://en.wikipedia.org/wiki/ Functional_reactive_programming ▸ Reactive Cocoa -
https://github.com/ ReactiveCocoa/ReactiveCocoa ▸ Model View View Model - http://www.objc.io/ issue-13/mvvm.html
TWITTER ▸ @jspahrsummers ▸ @joshaber ▸ @rob_rix ▸ @indragie ▸
@ashfurrow
SLIDES E DEMO https://github.com/gsampaio/RACMVVMPresentation
THANKS
None