ohtwo

import UIKit

public extension NSCollectionLayoutAnchor {
    struct Offset {
        fileprivate var absolute: CGPoint?
        fileprivate var fractional: CGPoint?
        
        private init(absolute: CGPoint?, fractional: CGPoint?) {
            self.absolute = absolute
            self.fractional = fractional

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import UIKit

extension UIView {
    
    var allSubviews: [UIView] {
        subviews + subviews.flatMap { $0.allSubviews }
    }
    
    func firstSubview<T: UIView>(of type: T.Type) -> T? {
        allSubviews.first { $0 is T } as? T

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func ==<U: Equatable, T: protocol<RawRepresentable, Equatable> where T.RawValue == U>(lhs: U, rhs: T) -> Bool {
  return lhs == rhs.rawValue
}

func !=<U: Equatable, T: protocol<RawRepresentable, Equatable> where T.RawValue == U>(lhs: U, rhs: T) -> Bool {
  return lhs != rhs.rawValue
}

ohtwo

import Foundation

let size = MemoryLayout<Int16>.stride
let data = Data(bytes: [1, 0, 2, 0, 3, 0]) // little endian for 16-bit values

let int16s = data.withUnsafeBytes { (bytes: UnsafePointer<Int16>) in
    Array(UnsafeBufferPointer(start: bytes, count: data.count / size))
}

let length = data.count * MemoryLayout<Int16>.stride

ohtwo

NSTimer is a great example of an over-verbose, outdated Objective-C API. To run a simple line of code after a delay, you need to write a lot of boilerplate crap.

How about this:

NSTimer.schedule(5.seconds) {
  println("Hello world!")
}

ohtwo

Automatic build versions from git in Xcode (and other goodies)

Installation procedure for pre-build actions to automatically populate Xcode Info.plist with dynamic data.

1. Xcode Scheme pre-action

Edit Xcode Scheme and add a pre-action script. Copy the contents of preaction.sh into the pre-action script box.

ohtwo

import Foundation

public struct Meter {
    fileprivate var value: Double
    
    public init(_ value: Double) {
        self.value = value
    }
    
    public init(_ value: Int) {

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mr	Marathi
bs	Bosnian
ee_TG	Ewe (Togo)
ms	Malay
kam_KE	Kamba (Kenya)
mt	Maltese
ha	Hausa
es_HN	Spanish (Honduras)
ml_IN	Malayalam (India)
ro_MD	Romanian (Moldova)

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extension NSDate {
    var stringFormattedAsRFC3339: String {
        return rfc3339formatter.stringFromDate(self)
    }
    
    class func dateFromRFC3339FormattedString(rfc3339FormattedString:String) -> NSDate?
    {
        /*
        NOTE: will replace this with a failible initializer when Apple fixes the bug
        that requires the initializer to initialize all stored properties before returning nil,

ohtwo

import Foundation

var token: dispatch_once_t = 0
func test() {
    dispatch_once(&token) {
        println("This is printed only on the first call to test()")
    }
    println("This is printed for each call to test()")
}