Your hosts Filip Maelbrancke Consultant @ AppFoundry fi[email protected] @fmaelbrancke Joris Dubois Consultant @ AppFoundry [email protected] @DuboisJoris 

AppFoundry appfoundry.be 

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Patterns 

Dependency Injection a 25-dollar term for a 5-cent concept 

Coding Example DI: Spot the problem #import @interface UserDefaultManager : NSObject - (void)registerLeetInteger; @end #import "UserDefaultManager.h" @implementation UserDefaultManager - (void)registerLeetInteger { [[[NSUserDefaults alloc] initWithSuiteName:@"LeetAppGroup"] setInteger:1337 forKey:@"leet"]; } @end 

Coding Example DI: Constructor Injection #import @interface UserDefaultManager : NSObject - (instancetype)initWithUserDefaults:(NSUserDefaults *)userDefaults; - (void)registerLeetInteger; @end #import "UserDefaultManager.h" @implementation UserDefaultManager { NSUserDefaults *_userDefaults; } //Constructor Injection - (instancetype)initWithUserDefaults:(NSUserDefaults *)userDefaults { self = [super init]; if(self) { _userDefaults = userDefaults; } return self; } - (void)registerLeetInteger { [_userDefaults setInteger:1337 forKey:@"leet"]; } @end 

Coding Example DI: Method Injection #import @interface UserDefaultManager : NSObject - (void)registerLeetIntegerOnUserDefaults:(NSUserDefaults *)userDefaults; @end #import "UserDefaultManager.h" @implementation UserDefaultManager //Method Injection - (void)registerLeetIntegerOnUserDefaults:(NSUserDefaults *)userDefaults { [userDefaults setInteger:1337 forKey:@"leet"]; } @end 

Coding Example DI: Property Injection #import @interface UserDefaultManager : NSObject //Property Injection @property (nonatomic, strong) NSUserDefaults *userDefaults; - (void)registerLeetInteger; @end #import "UserDefaultManager.h" @implementation UserDefaultManager - (void)registerLeetInteger { [self.userDefaults setInteger:1337 forKey:@"leet"]; } @end 

MVVM 

MVC 

MASSIVE View Controller 

View Controller View Model MVVM View Controller View Model View Model 

Unit Testing frameworks & code coverage 

OCMock 

Coding Example OCMock: Mocking Class mock OCMClassMock([SomeClass class]); Protocol mock OCMProtocolMock(@protocol(SomeProtocol)); Strict class & protocol mock OCMStrictClassMock([SomeObject class]); OCMStrictProtocolMock(@protocol(SomeProtocol)); Partial mock OCMPartialMock(anObject); Observer mock OCMObserverMock() 

Coding Example OCMock: Stubbing OCMStub([mock someMethod]).andReturn(anObject); OCMStub([mock someMethodReturningABool]).andReturn(YES); OCMStub([mock someMethod]).andCall(anotherObject, @selector(aDifferentMethod)); OCMStub([mock someMethod]).andThrow(anException); 

Coding Example OCMock: Verification OCMVerify([mock someMethod]); 

Coding Example OCMock - (void)populateView:(UIView *)view withData:(id)data { PersonView *personView = (PersonView *)view; PersonObject *personObject = (PersonObject *)data; [_imageService fetchImageFromURL:personObject.imageURL fallBackImage:[UIImage personFallBackImage] forImageView:personView.personImageView]; } - (void)testPopulateViewWithDataDoesInvokeImageServiceForPersonImageViewWithExpectedFallbackImage { UIImageView *givenImageView = [[UIImageView alloc] init]; OCMExpect(_view.personImageView).andReturn(givenImageView); [_populator populateView:_view withData:_data]; OCMVerify([_imageService fetchImageFromURL:_data.imageURL fallBackImage:[UIImage personFallBackImage] forImageView:givenImageView]); } 

OCMockito personal favorite 

Coding Example OCMockito: Mocking Class mock mockClass([SomeClass class]); Protocol mock mockProtocol(@protocol(SomeProtocol)); mockProtocolWithoutOptionals(@protocol( SomeProtocol)); Class & protocol mock mockObjectAndProtocol([SomeObject class], @protocol(SomeProtocol)); 

Coding Example OCMockito: Stubbing [given([mock someMethod]) willReturn:anObject]; [given([mock aMethodReturningABoolean]) willReturnBool:YES]; 

Coding Example OCMockito: Verification [verify(mock) someMethod]; [verifyCount(mock, times(1)) someMethod]; [verifyCount(mock, never()) someMethod]; 

Coding Example OCMockito - (void)populateView:(UIView *)view withData:(id)data { PersonView *personView = (PersonView *)view; PersonObject *personObject = (PersonObject *)data; [_imageService fetchImageFromURL:personObject.imageURL fallBackImage:[UIImage personFallBackImage] forImageView:personView.personImageView]; } - (void)testPopulateViewWithDataDoesInvokeImageServiceForPersonImageViewWithExpectedFallbackImage { UIImageView *givenImageView = [[UIImageView alloc] init]; [given(_view.personImageView) willReturn:givenImageView]; [_populator populateView:_view withData:_data]; [verify(_imageService) fetchImageFromURL:_data.imageURL fallBackImage:[UIImage personFallBackImage] forImageView:givenImageView]; } 

Expecta 

Coding Example Expecta Object matchers .conformsTo(@protocol(SomeProtocol)) .equal(anObject) .beIdenticalTo(anObject) .beNil() .beInstanceOf([SomeClass class]) Number matchers .beCloseTo(@3) .beGreaterThan(@3) .beGreaterThanOrEqualTo(@3) .beLessThan(@3) .beLessThanOrEqualTo(@3) .beFalsy() .beTruthy() 

Coding Example Expecta Text matchers .beginWith(@"someString") .endWith(@"someString") .match(@"regex") Collection matchers .contain(objectA, objectB) .beSupersetOf(objectA, objectB) .haveCountOf() .beEmpty() Logical matchers .notTo Async matchers .will .willNot .after(2) 

Coding Example Expecta - (void)populateView:(UIView *)view withData:(id)data { PersonView *personView = (PersonView *)view; PersonObject *personObject = (PersonObject *)data; personView.ageLabel.text = personObject.age.stringValue; } - (void)testPopulateViewWithDataDoesPopulateAgeLabelWithAge { UILabel *givenLabel = [[UILabel alloc] init]; OCMExpect(_view.ageLabel).andReturn(givenLabel); [_populator populateView:_view withData:_data]; expect(givenLabel.text).to.equal(_data.age.stringValue); } 

OCHamcrest personal favorite 

Coding Example OCHamcrest Object matchers conformsTo(@protocol(SomeProtocol)) equalTo(anObject) sameInstance(anObject) hasProperty(@"propertyName", @“propertyValue") instanceOf([SomeClass class]) Number matchers closeTo(@3) greaterThan(@3) greaterThanOrEqualTo(@3) lessThan(@3) lessThanOrEqualTo(@3) isFalse() isTrue() 

Coding Example OCHamcrest Text matchers containsSubstring(@"someString"); startsWith(@"someString"); endsWith(@"someString"); equalToIgnoringCase(@"someString"); Collection matchers contains(objectA, objectB) hasItems(objectA, objectB) everyItem() isEmpty() Logical matchers isNot() anything() allOf() 

Coding Example OCHamcrest - (void)populateView:(UIView *)view withData:(id)data { PersonView *personView = (PersonView *)view; PersonObject *personObject = (PersonObject *)data; personView.ageLabel.text = personObject.age.stringValue; } - (void)testPopulateViewWithDataDoesPopulateAgeLabelWithAge { UILabel *givenLabel = [[UILabel alloc] init]; [given(_view.ageLabel) willReturn:givenLabel]; [_populator populateView:_view withData:_data]; assertThat(givenLabel.text, is(equalTo(_data.age.stringValue)); } 

Specta 

Coding Example Specta SpecBegin(_PersonViewPopulator) describe(@"PersonViewPopulator", ^{ __block PersonViewPopulator *_populator; __block PersonObject *_data; __block PersonView *_view; __block id _imageService; __block NSURL *_imageURL; beforeEach(^{ _imageURL = [[NSURL alloc] initWithString:@"http://www.apple.com"]; _view = OCMClassMock([PersonView class]); _imageService = OCMProtocolMock(@protocol(ImageService)); _populator = [[PersonViewPopulator alloc] initWithImageService:_imageService]; _data = [[PersonObject alloc] initWithName:@"expectedName" imageURL:_imageURL slogan:@"expectedSlogan" location:@"expectedLocation" age:@25]; }); it(@"does invoke image service with expected fallback image", ^{ UIImageView *givenImageView = [[UIImageView alloc] init]; OCMExpect(_view.personImageView).andReturn(givenImageView); [_populator populateView:_view withData:_data]; OCMVerify([_imageService fetchImageFromURL:_data.imageURL fallBackImage:[UIImage personFallBackImage] forImageView:givenImageView]); }); }); SpecEnd 

Code coverage live demo 

UI Testing 

UI testing in Xcode live demo 

KIF live demo 

Clean Code - Robert C. Martin Test-Driven iOS Development - Graham Lee Test-Driven Development by Example - Kent Beck 

User feedback 

A/B testing 

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Questions? Joris Dubois Consultant @ AppFoundry [email protected] @DuboisJoris