el-hoshino
/ CodePiece.swift
Created
March 27, 2018 09:08
— forked from takasek/CodePiece.swift
ポプテピピックが完成したら竹書房を破壊するSwiftコード #CodePiece
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| enum PopTeamEpic: String { | |
| case po = "ポ" | |
| case p = "プ" | |
| case teame = "テピ" | |
| case pic = "ピック" | |
| } | |
| struct 蒼井翔太: Sequence, IteratorProtocol { | |
| mutating func next() -> PopTeamEpic? { | |
| switch arc4random_uniform(4) { | |
| case 0: return .po |
el-hoshino
/ Lazy.swift
Created
March 5, 2018 07:45
Declaring a lazy-initialized object with `let` in Swift
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| class Lazy <T> { | |
| private var t: T? | |
| private let initializer: () -> T | |
| private let semaphore = DispatchSemaphore(value: 1) | |
| init(_ initializer: @escaping () -> T) { | |
| self.initializer = initializer |
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| let myVariable: Int = { while(true) {} }() |
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| protocol TestProtocol { | |
| associatedtype Element | |
| } | |
| struct TestStruct<Element>: TestProtocol { | |
| let element: Element | |
| } | |
| // error: type 'TestStruct<Element>' does not conform to protocol 'TestProtocol' |
el-hoshino
/ Scanner.swift
Created
January 30, 2018 03:30
Using Scanner to scan String to Int in Swift (Objective-C way)
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| let string = "123" | |
| let scanner = Scanner(string: string) | |
| var int = NSNotFound | |
| scanner.scanInt(&int) | |
| print(int) |
el-hoshino
/ file0.swift
Last active
January 25, 2018 05:33
【バグ】NSObject を継承したオブジェクトを unowned プロパティーとして保持すると、それを保持しているインスタンスを print すると落ちる ref: https://qiita.com/lovee/items/56555e3c7cf880a44efd
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| import Foundation | |
| class C: NSObject { | |
| } | |
| struct D { | |
| unowned let x: C | |
| } |
el-hoshino
/ Operator.swift
Last active
September 7, 2017 06:52
Swift 4 で「プラマイ」範囲を作る ref: http://qiita.com/lovee/items/4159b5c64b371ecb0b8f
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| infix operator ± : RangeFormationPrecedence | |
| extension Numeric where Self: Comparable { | |
| public static func ± (lhs: Self, rhs: Self) -> ClosedRange<Self> { | |
| let added = lhs + rhs | |
| let subtracted = lhs - rhs | |
| let lowerBound = min(added, subtracted) | |
| let upperBound = max(added, subtracted) | |
| return lowerBound ... upperBound |
el-hoshino
/ Playground.swift
Last active
July 26, 2017 09:25
Swift でアニメーションの連続実行をしてみる話 ref: http://qiita.com/lovee/items/460cbb02a345e0ff7910
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| let base = UIView(frame: CGRect(x: 0, y: 0, width: 400, height: 400)) | |
| base.backgroundColor = .white | |
| PlaygroundPage.current.liveView = base | |
| let view = UIView(frame: CGRect(x: 100, y: 100, width: 200, height: 200)) | |
| view.backgroundColor = .blue | |
| base.addSubview(view) | |
| // アニメーションブロック | |
| UIView.animate(eachBlockDuration: 1, eachBlockDelay: 0, eachBlockOptions: .curveEaseInOut, animationBlocks: |
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| extension Int { | |
| static func `init`(float: Float) -> Float { | |
| return float | |
| } | |
| } | |
| let float = Int(float: 3.14) | |
| print(float) |
el-hoshino
/ CodePiece.swift
Created
March 2, 2017 07:56
そういえば今日unsafePointerの話あったけど、ポインター使うとこんなこともできるよ #CodePiece #tryswiftconf
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| var age = 28 | |
| let unknown = withUnsafePointer(to: &age) { $0.advanced(by: 12).pointee } | |
| print(unknown) // 7597125269629269102 |