Jesse-calkin

import Foundation

extension String {

    func truncateEnd(length: Int, omissionMarker: String? = "...") -> String {
        guard self.characters.count > length  else { return self }

        return self.substringToIndex(self.startIndex.advancedBy(length)) + (omissionMarker ?? "")
    }

Jesse-calkin

extension UIImage {

    /**
     Returns a new `UIImage` with an adjusted exposure value.

     - Parameter ev: The amount to adjust the exposure value. Negative for darker, positive for lighter.
     - Returns: a new `UIImage` with an adjusted exposure value.
     */
    func imageWithAdjustedExposure(ev: Double) -> UIImage? {
        guard let cgImage = self.CGImage else { return nil }

Jesse-calkin

import UIKit

public extension UIColor {

    public static func checkerboardColor(size: CGSize? = CGSize(width: 100, height: 100), color1: UIColor? = UIColor.grayColor(), color2: UIColor? = UIColor.darkGrayColor()) -> UIColor? {
        guard let checkers = CIFilter(name: "CICheckerboardGenerator") else { return nil }
        
        let color0 = CoreImage.CIColor(color: color1!)
        let color1 = CoreImage.CIColor(color: color2!)
        

Jesse-calkin

import UIKit

@IBDesignable public class GradientView: UIView {

    // MARK: - Internal

    @IBInspectable public var color1: UIColor = UIColor.magentaColor()
    @IBInspectable public var color2: UIColor = UIColor.cyanColor()
    @IBInspectable public var color3: UIColor = UIColor.clearColor()
    @IBInspectable public var color4: UIColor = UIColor.clearColor()

Jesse-calkin

//: An `AVFoundation` Playground for playing video with `AVPlayer`. Using just a bare `AVPlayer`, there will be no playback controls.
  
import UIKit
import PlaygroundSupport
import AVFoundation

class MyViewController : UIViewController {
    
    // Other example streams can be found here: https://developer.apple.com/streaming/examples/
    let url = URL(string: "http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8")!