Introduction of CXCKeyValueObserver - KVO and Unit Testing

My presentation @ Cocoa Kansai #54, about CXCKeyValueObserver (https://github.com/cockscomb/CXCKeyValueObserver)

Transcript

1. cockscomb
3. ͸ͯͳϒϩά
6. CXC
7. CXCKeyValueObserver
8. Key Value Observation
9. Key Value Observation • Key Value CodingͰΦϒδΣΫτͷঢ়ଶΛ؂ࢹ • @property͸KVCͷنଇʹै͏ͨΊ؂ࢹͰ͖Δ • Modelͷঢ়ଶΛ؂ࢹͯ͠ViewΛߋ৽ͳͲͰศར
10. - (void)viewDidLoad { [super viewDidLoad]; [self.someObject addObserver:self forKeyPath:@"example" options:NSKeyValueObservingOptionNew context:NULL]; } ! - (void)dealloc { [self.someObject removeObserver:self forKeyPath:@"example"]; } ! - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if (object == self.someObject) { if ([keyPath isEqualToString:@"example"]) { // do something } } }
11. - (void)viewDidLoad { [super viewDidLoad]; [self.someObject addObserver:self forKeyPath:@"example" options:NSKeyValueObservingOptionNew context:NULL]; } ! - (void)dealloc { [self.someObject removeObserver:self forKeyPath:@"example"]; } ! - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if (object == self.someObject) { if ([keyPath isEqualToString:@"example"]) { // do something } } } 1
12. - (void)viewDidLoad { [super viewDidLoad]; [self.someObject addObserver:self forKeyPath:@"example" options:NSKeyValueObservingOptionNew context:NULL]; } ! - (void)dealloc { [self.someObject removeObserver:self forKeyPath:@"example"]; } ! - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if (object == self.someObject) { if ([keyPath isEqualToString:@"example"]) { // do something } } } 1 2
13. - (void)viewDidLoad { [super viewDidLoad]; [self.someObject addObserver:self forKeyPath:@"example" options:NSKeyValueObservingOptionNew context:NULL]; } ! - (void)dealloc { [self.someObject removeObserver:self forKeyPath:@"example"]; } ! - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if (object == self.someObject) { if ([keyPath isEqualToString:@"example"]) { // do something } } } 1 3 2
14. - (void)viewDidLoad { [super viewDidLoad]; [self.someObject addObserver:self forKeyPath:@"example" options:NSKeyValueObservingOptionNew context:NULL]; } ! - (void)dealloc { [self.someObject removeObserver:self forKeyPath:@"example"]; } ! - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if (object == self.someObject) { if ([keyPath isEqualToString:@"example"]) { // do something } } }
15. • observeValueForKeyPath:ofObject:change:context:
 ͱ͍͏ϝιουʹશͯهड़͠ͳ͚Ε͹ͳΒͳ͍ • removeObserver:forKeyPath:
 Λݺͼ๨Εͯ͸͍͚ͳ͍ • ͩΜͩΜෳࡶʹͳ͍ͬͯ͘ • ෳ਺ਓ։ൃʹ޲͔ͳ͍આ
16. CXCKeyValueObserver
17. - (void)viewDidLoad { [super viewDidLoad]; _observer = [[CXCKeyValueObserver alloc] initWithObservee:self.someObject forKeyPath:@"example" options:NSKeyValueObservingOptionNew block:^(id observee, NSString *keyPath, NSDictionary *change) { // do something }]; }
18. • BlockΛ༻͍ͯએݴతʹهड़ • observer΁ͷڧࢀর͕ͳ͘ͳΔͱ͖ࣗಈతʹ
 removeObserver:forKeyPath: • ϦʔζφϒϧͳΠϯλʔϑΣʔε
19. https://github.com/cockscomb/CXCKeyValueObserver
20. CXCKeyValueObserver • MIT License • CocoaPodsରԠ • ୯ମςετ
21. ˒14
22. Unit Test
23. The Unit Testing of Objective-C • https://speakerdeck.com/cockscomb/the- unit-testing-of-objective-c • Kiwi • Nocilla
24. Unit Testing Tools • XCTest • (BDDϥΠϒϥϦ) • ඇಉظςετϥΠϒϥϦ • ΧελϜϚονϟ • Mock/StubϥΠϒϥϦ • ωοτϫʔΫstubϥΠϒϥϦ
25. XCTest
26. BDD • ϥΠϒϥϦ • Kiwi • Specta • Behavior Driven Development
27. ඇಉظςετ • ϥΠϒϥϦ • Kiwi • Specta • TRVSMonitor • TKRGuard • ಉظతʹॲཧ͞Εͳ͍ͱ͖ͷςετ
28. ΧελϜϚονϟ • ϥΠϒϥϦ • Kiwi • OCHamcrest • Expecta • ศརͳAssert
29. Mock/Stub • ϥΠϒϥϦ • Kiwi • OCMock • ςετ͍ͨ͠ΦϒδΣΫτͷؔ࿈ΦϒδΣΫτ Λٖࣅతʹ࡞Γग़ͯ͠ςετΛ؆ུԽ
30. ωοτϫʔΫStub • ϥΠϒϥϦ • Nocilla • OHHTTPStubs • ωοτϫʔΫͷঢ়ଶ΍ϨεϙϯεΛٖࣅతʹ࡞ Γग़ͯ͠ωοτϫʔΫपΓͷςετΛ؆ུԽ
31. • BDD • Kiwi • Specta • ඇಉظςετ • Kiwi • Specta • TRVSMonitor • TKRGuard ! • ΧελϜϚονϟ • Kiwi • OCHamcrest • Expecta • Mock/Stub • Kiwi • OCMock • ωοτϫʔΫstub • Nocilla • OHHTTPStubs
32. CXCKeyValueObserver • Specta • Expecta • OCMock
33. @interface CXCKeyValueObserverTestsObject : NSObject @property (nonatomic, strong) id exampleProperty; @end @implementation CXCKeyValueObserverTestsObject @end ! SpecBegin(CXCKeyValueObserver) describe(@"KeyValueObserver", ^{ ! __block CXCKeyValueObservingBlock block; __block id gotObservee; __block NSString *gotKeyPath; __block NSDictionary *gotChange; __block CXCKeyValueObserverTestsObject *observee; __block NSString *keyPath; ! beforeEach(^{ block = ^(id _observee, NSString *_keyPath, NSDictionary *_change) { gotObservee = _observee; gotKeyPath = _keyPath; gotChange = _change; }; gotObservee = nil; gotKeyPath = nil; gotChange = nil; observee = [[CXCKeyValueObserverTestsObject alloc] init]; keyPath = NSStringFromSelector(@selector(exampleProperty)); }); ! ... }); SpecEnd
34. it(@"should call its block when the observing property changed", ^{ __unused CXCKeyValueObserver *observer = [[CXCKeyValueObserver alloc] initWithObservee:observee forKeyPath:keyPath options:0 block:block]; ! observee.exampleProperty = @"exampleNewValue"; ! expect(gotObservee).to.equal(observee); expect(gotKeyPath).to.beIdenticalTo(keyPath); expect(gotChange).notTo.beNil(); });
35. it(@"should call removeObserver:forKayPath:context: when deallocated", ^{ id mock = [OCMockObject niceMockForClass: [CXCKeyValueObserverTestsObject class]]; [[mock expect] removeObserver:[OCMArg any] forKeyPath:keyPath context:[OCMArg anyPointer]]; ! @autoreleasepool { CXCKeyValueObserver *observer = [[CXCKeyValueObserver alloc] initWithObservee:mock forKeyPath:keyPath options:0 block:block]; ! observer = nil; } ! [mock verify]; });
36. CXCKeyValueObserver • Specta • Expecta • OCMock
37. ࡶஊίʔφʔ
38. description • descriptionॻ͍͓͖͍ͯͨ • ඞཁʹԠͯ͡debugDescription • AppCodeศར
39. description - (NSString *)description { NSMutableString *description = [NSMutableString stringWithFormat:@"<%@: ", NSStringFromClass([self class])]; [description appendFormat:@"self.observee=%@", self.observee]; [description appendFormat:@", self.keyPath=%@", self.keyPath]; [description appendFormat:@", self.options=%lu", (unsigned long)self.options]; [description appendFormat:@", self.block=%p", self.block]; [description appendString:@">"]; return description; }
40. AppCode
41. AppCode • JetBrains IDE • ௒ߴػೳ
45. AppCode • ݡ͍ΦʔτίϯϓϦʔτ • ϦϑΥʔϚοτ • ίʔυͷੜ੒ • ϦϑΝΫλϦϯά • ίʔυͷղੳ
46. github.com/cockscomb/CXCKeyValueObserver
47. DPDLTDPNCIBUFOBCMPHDPN