Download - Swift チャチャチャ #love_swift
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/* 2016.06.27 */ /* 集まれSwift好き! Swift愛好会 vol8 */
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/**
*/
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紙版は絶版、電⼦書籍は販売中
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/* 2016/06/13 2016/06/17 */
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/* Wikipedia より引用 */
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sin ✓ =
p3 cos ✓
この式が成り立つときの sinθ、cosθ、tanθの値を求める
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sin ✓ =
p3 cos ✓
この式が成り立つときの sinθ、cosθ、tanθの値を求める
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sin ✓
cos ✓=
p3
1
sin ✓
cos ✓= tan ✓
まず、次の関係性がある
問題の式を変形すると…
θcos
sintan
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sin ✓
cos ✓=
p3
1
問題の変形から比が判る
1
p3
三平方の定理を使って…θ
cos
sintan
x
2 = 12 +p32
x =p1 + 3 = 2
x
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1
p3
2
θcos
sintan
各辺の比から
sin ✓ =
p3
2
, cos ✓ =
1
2
元の式と三角関数の関係から
tan ✓ =p3
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// あるインスタンスメソッドの処理を初回だけ実行して viewController.prepare() // Do Something
// それ以降は、呼び出しても何もしないようにしたい viewController.prepare() // Do Nothing viewController.prepare() // Do Nothing
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// あるインスタンスメソッドの処理を初回だけ実行して viewController.prepare() // Do Something
// それ以降は、呼び出しても何もしないようにしたい viewController.prepare() // Do Nothing viewController.prepare() // Do Nothing
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final class ViewController : UIViewController { private(set) var prepare: Void = { print("Prepared")
}() } // STEP1: この時点では初期化時点での実行になる let object = ViewController(nibName:nib, bundle:nil)
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final class ViewController : UIViewController { private(set) lazy var prepare: Void = { print("Prepared")
}() } // STEP2: プロパティ参照で初回参照時のみの実行になる object.prepare as Void
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final class ViewController : UIViewController { private(set) lazy var prepare: () -> Void = { print("Prepared") return {} }() } // STEP3: 初回だけ実行される関数として使える object.prepare()
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final class ViewController : UIViewController {
// ここに Interface Builder でラベルを連結 private var noteLabel: UILabel }
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final class ViewController : UIViewController {
// ここに Interface Builder でラベルを連結 private var noteLabel: UILabel }
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final class ViewController : UIViewController {
// STEP1: @IBOutlet を付けると IB から連結可能 @IBOutlet private var noteLabel: UILabel }
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final class ViewController : UIViewController {
// STEP2: 使用時までに初期化を間にあわせる決意 @IBOutlet private var noteLabel: UILabel ! }
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final class ViewController : UIViewController {
// STEP3: 変更を監視して速やかに設定(コードも明瞭) @IBOutlet private var noteLabel: UILabel ! { didSet { noteLabel.text = "\(arc4random())" } } }
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final class ViewController : UIViewController { private lazy var prepareAtFirstTime: () -> Void = { print("Prepared") return {} }()
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated) prepareAtFirstTime() } }
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final class ViewController : UIViewController {
@IBOutlet private var noteLabel: UILabel ! { didSet { noteLabel.text = "\(arc4random())" } } }
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Enjoy! Swift/* Thank you */