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April 8, 2017 06:09
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Swifter Tips - 3 - Notes: http://www.jianshu.com/p/85dbf5a524e8
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| func random(in range: Range<Int>) -> Int { | |
| return Int(arc4random_uniform(UInt32(range.count))) + range.lowerBound | |
| } | |
| for _ in 0..<5 { | |
| let range = Range<Int>(1...6) | |
| print(random(in: range)) | |
| } |
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| enum MyEnum { | |
| case value1, value2, value3 | |
| } | |
| func check(someValue: MyEnum) -> String { | |
| switch someValue { | |
| case .value1: | |
| return "OK" | |
| case .value2: | |
| return "Maybe OK" | |
| default: | |
| fatalError("Should NOT show！") | |
| } | |
| } |
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| enum ImageName: String { | |
| case imageA = "image_a" | |
| } | |
| extension UIImage { | |
| convenience init!(imageName: ImageName) { | |
| self.init(named: imageName.rawValue) | |
| } | |
| } | |
| let img = UIImage(imageName: .imageA) |
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| import UIKit | |
| import PlaygroundSupport | |
| PlaygroundPage.current.needsIndefiniteExecution = true | |
| class MyClass { | |
| @objc func callMe() { | |
| print("Hi") | |
| } | |
| } | |
| let object = MyClass() | |
| Timer.scheduledTimer(timeInterval: 1.0, | |
| target: object, | |
| selector: #selector(MyClass.callMe), | |
| userInfo: nil, | |
| repeats: true) |
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| import UIKit | |
| import PlaygroundSupport | |
| let label = UILabel(frame: CGRect(x: 0.0, y: 0.0, width: 400.0, height: 200.0)) | |
| label.backgroundColor = .white | |
| label.font = UIFont.systemFont(ofSize: 32.0) | |
| label.textAlignment = .center | |
| label.text = "maimieng.com" | |
| PlaygroundPage.current.liveView = label |
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| import UIKit | |
| let num = Double.nan | |
| if num.isNaN { | |
| print("num is NaN") | |
| } | |
| // OUTPUT: | |
| // num is NaN |
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| func printLog<T>(_ message: T, | |
| file: String = #file, | |
| method: String = #function, | |
| line: Int = #line) { | |
| #if DEBUG | |
| print("\((file as NSString).lastPathComponent)[\(line)], \(method): \(message)") | |
| #endif | |
| } |
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| import UIKit | |
| protocol EnumeratableEnum { | |
| static var allValue: [Self] { get } | |
| } | |
| enum Suit: String { | |
| case spades = "黑桃" | |
| case hearts = "红桃" | |
| case clubs = "草花" | |
| case diamonds = "方片" | |
| } | |
| extension Suit: EnumeratableEnum { | |
| static var allValue: [Suit] { | |
| return [.spades, .hearts, .clubs, .diamonds] | |
| } | |
| } | |
| for suit in Suit.allValue { | |
| print(suit) | |
| } | |
| // OUTPUT: | |
| // spades | |
| // hearts | |
| // clubs | |
| // diamonds |
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| import UIKit | |
| func tailSum(_ n: UInt) -> UInt { | |
| func sumInternal(_ n: UInt, current: UInt) -> UInt { | |
| if n == 0 { | |
| return current | |
| } else { | |
| return sumInternal(n - 1, current: current + n) | |
| } | |
| } | |
| return sumInternal(n, current: 0) | |
| } | |
| tailSum(100000) |
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