J04ΞϓϦͷίʔυϨϏϡʔ
Ͱ࠷ۙؾʹͳΔͱ͜Ζ @yashigani ؔ੢ϞόΠϧΞϓϦݚڀձ#2 

yashigani id:yashigani_w @yashigani Mobile Application Engineer http://yashigani.hatenablog.com Hatena 

https://flic.kr/p/b3j2n2 ίʔυϨϏϡʔ ͯ͠·͔͢ʁ 

ͳΜ͔ωλ୳ͯͨ͠ΜͰ͚͢Ͳಛʹ͜Εͬ ͯ΋ͷ͕ແͯ͘ɼ͋ΕʁίʔυϨϏϡʔͱ ͔ΊͬͪΌҙࣝߴͦ͏Ͱ͍͍Μ͡ΌͶʁͬ ͓ͯ΋ͬͯ·ͱΊͯΈͨΜͰ͢Αɽͦͨ͠ ΒίʔυϨϏϡʔͷ؍఺ͬͯΑ͘ߟ͑ͨΒ ΞϓϦέʔγϣϯΛઃܭ͢Δͱ͖ʹؾΛ ͚ͭΔ΂͖ϙΠϯτ·ͱΊΈ͍ͨͳײ͡ ͳΜͰ͢ΑɽͳΜͰͦ͏͍͏͜ͱ࿩͢ΜͰ ͚͢ͲɼίʔυϨϏϡʔͬͯ୊͓͍ͯͨ͠ ΄͏͕ͳΜ͔͋Γ͕ͨΈ͕ߴ͍ΜͰࠓ೔͸ ίʔυϨϏϡʔͷ࿩ͱ͍͏͜ͱʹͳΓ·͢ɽ 

TUPSZCPBSEؔ࿈ 

͜ΕstoryboardͰͰ͖·ͤΜ͔ʁ • ࡉ͔͍viewͷઃఆ΋Ͱ͖Δ͚ͩstoryboardͰ׬݁͞ ͤͨ΄͏ָ͕ • ෼ࢄ͢Δͱ͋ͱͰ௚͠ʹ͍͘ • ϨΠΞ΢τͷίʔυ΋جຊ͸ॻ͔ͳ͍ • (AutoLayoutͷϨϏϡʔ͸ࠜੑͰ΍Δ) 

storyboardͰઃఆͰ͖ͳ͍஋ • viewDidLoadͱ͔awakeFromNibͰೖΕΔͷ͸! • propertyͷdidSetΛ࢖ͬͨ΄͏͕៉ྷ • Objective-C?ૣ͘غͯͯ͘Ε 

class ViewController: UIViewController { @IBOutlet weak var textView: UITextView! { didSet { textView.textContainerInset = UIEdgeInsets(top: 16, left: 16, bottom: 16, right: 16) } } } 

IBInspectableΛઃఆ͢Δ • ઃఆ͠ͳ͍ཧ༝͸ͳ͍ • ΠϚΠν࢖͍ʹ͔ͬͨ͘ΧελϜϏϡʔͷ࠶ར༻ੑ ͕ΊͬͪΌ্͕Γ·͢ 

@IBDesignable class BorderedLabel: UILabel { @IBInspectable var borderColor: UIColor? { get { return UIColor(CGColor: self.layer.borderColor) } set { self.layer.borderColor = newValue?.CGColor ?? nil } } @IBInspectable var borderWidth: CGFloat = 1.0 { didSet { layer.borderWidth = borderWidth } } @IBInspectable var cornerRadius: CGFloat = 0.0 { didSet { layer.cornerRadius = cornerRadius layer.masksToBounds = cornerRadius > 0.0 } } } 

@IBDesignable class BorderedLabel: UILabel { @IBInspectable var borderColor: UIColor? { get { return UIColor(CGColor: self.layer.borderColor) } set { self.layer.borderColor = newValue?.CGColor ?? nil } } @IBInspectable var borderWidth: CGFloat = 1.0 { didSet { layer.borderWidth = borderWidth } } @IBInspectable var cornerRadius: CGFloat = 0.0 { didSet { layer.cornerRadius = cornerRadius layer.masksToBounds = cornerRadius > 0.0 } } } 

7JFX
$POUSPMMFSؔ࿈ 

͜ͷpropertyݮΒͤ·ͤΜ͔ʁ • stored property͸ঢ়ଶͳͷͰͰ͖Δ͚ͩݮΒͨ͠΄ ͏͕Α͍ • computed property͸ผ • closureͰΩϟϓνϟ͢Δͱ͔ͰͳΜͱ͔Ͱ͖ͳ͍͔ 

UITableViewDataSource ෼ׂͰ͖·ͤΜ͔ʁ • UITableViewDataSource͸෼ׂ͠΍͍͢ͷͰૣΊʹ ෼ׂ͓ͯ͘͠ • NSObject͸storyboard͔Β஫ೖͰ͖Δ 

UITableViewDataSource ෼ׂͰ͖·ͤΜ͔ʁ • UITableViewDataSource͸෼ׂ͠΍͍͢ͷͰૣΊʹ ෼ׂ͓ͯ͘͠ • NSObject͸storyboard͔Β஫ೖͰ͖Δ 

?ΑΓ! • viewDidLoad΍prepareForSegueͰॳظԽ͢ΔΑ͏ ͳproperty͸Optionalʹ͕ͪ͠ • OptionalΑΓImplicitly Unwrapped Optionalͷ΄͏ ͕࢖͍΍͍͢ • Ͳ͏ͤແ͍ͱಈ͔ͳ͍Μ͔ͩΒૣ͘Ϋϥογϡͨ͠ ΄͏͕ಘ 

4XJGUؔ࿈ 

computed property࢖͑·ͤΜ͔ʁ • ఆ਺΍ͦͷΦϒδΣΫτͷঢ়ଶ͔Βࢉग़Ͱ͖Δ஋Λ ฦ͢ϝιου͸computed propertyʹ • υϝΠϯΛด͡ࠐΊΒΕΔ • ͋ͱ()͕͍Βͳ͘ͳΔͷͰྑ͍ 

enum࢖͑·ͤΜ͔ʁ • ϓϦϛςΟϒͳ஋΍ઐ༻ͷΦϒδΣΫτͰঢ়ଶΛ
 ؅ཧ͍͍ͯ͠ͷ͸খֶੜ·Ͱ • UITableViewͷsectionͱ͔(Raw ValuesΛ࢖͏ͱΑ͍) • enumʹด͡ࠐΊΔ • ྫ͑͹section headerͷλΠτϧͱ͔ • Associated Values΋ߟྀ͢Δ 

lazyͰOptionalΛ֎͢ • ࣗ෼ͷproperty Aʹґଘ͢Δproperty Bͷ࿩ • B͕ඞཁͳͱ͖ʹ͸A͸ଘࡏ͢Δͱ͖ɼBΛlazyʹ͢ Δ͜ͱͰOptionalΛ֎͢͜ͱ͕Ͱ͖Δ 

class BookmarkManager { let manager: UserManager init(_ manager: UserManager) { self.manager = manager } } class ViewController: UIViewController { var userManager: UserManager! var bookmarkManager: BookmarkManager! override func viewDidLoad() { bookmarkManager = BookmarkManager(userManager) } } 

class BookmarkManager { let manager: UserManager init(_ manager: UserManager) { self.manager = manager } } class ViewController: UIViewController { var userManager: UserManager! lazy var bookmarkManager: BookmarkManager = BookmarkManager(self.userManager) } 

ςετͰ͸!Λ࢖Θͳ͍ • ςετ͕ࣦഊ͢ΔΜ͡Όͳͯ͘མͪΔ • CIͰٽ͘ • ࠷ѱͷঢ়ଶ • ஋͕औಘͰ͖Δ͸ͣͰ΋Optional Chainͱ͔҆શͳ खஈΛ࢖͏ 

let bookmark: Bookmark = ... XCTAssertNotNil(bookmark.title, "...") XCTAssertEqual(bookmark.title!, "ؔ ੢ϞόΠϧΞϓϦݚڀձ#2", "...") 

let bookmark: Bookmark = ... XCTAssertNotNil(bookmark.title, "...") XCTAssertEqual(bookmark.title ?? "", "ؔ੢ϞόΠϧΞϓϦݚڀձ#2", "...") 

·ͱΊ 

• storyboard࢖͍౗ͯ͠΄͍͠ • View Controller͸ͱʹ͔͘ଠΒͳ͍Α͏ʹ͢Δ • Swift͸ͱʹ͔͘࠷ߴ 

͋Γ͕ͱ͏͍͟͝·ͨ͠