Swift extensions for common occurances

ArrayExtensions.swift

//
//  ArrayExtensions.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/8/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import Foundation

extension Array {
	// MARK: - Index helpers
	var firstObject: T {
		return self[startIndex]
	}

	var lastObject: T {
		return self[endIndex - 1]
	}
}

CoreGraphicsExtension.swift

//
//  CoreGraphicsExtensions.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/28/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import CoreGraphics

extension CGRect {
	// MARK: - Dimesion helper functions
	var x: CGFloat {
		get {
			return origin.x
		}
	}

	var y: CGFloat {
		get {
			return origin.y
		}
	}

	var center: CGPoint {
		get {
			return CGPointMake(width / 2.0, height / 2.0)
		}
	}
}

NSFileManagerExtensions.swift

//
//  NSFileManagerExtensions.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/26/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import Foundation

extension NSFileManager {
	// MARK: - Directory helper functions
	class func applicationDocumentDirectory() -> NSURL {
		return (NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).lastObject) as NSURL
	}
}

StringExtensions.swift

//
//  StringExtensions.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/8/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import Foundation

extension String {
	// MARK: - String helpers
	var length: Int {
		get {
			return countElements(self)
		}
	}

	// MARK: - Sting comparison functions
	func containsStrings(strings: Array <String>) -> Bool {
		for string in strings {
			// println("SELF: \(self), STRING: \(string)")
			var subString = self as NSString
			if subString.containsString(string) {
				return true
			}
		}
		return false
	}

	func containsStringsIgnoringCase(strings: Array <String>) -> Bool {
		for string in strings {
			// println("SELF: \(self.lowercaseString), STRING: \(string)")
			var subString = self.lowercaseString as NSString
			if subString.containsString(string) {
				return true
			}
		}
		return false
	}
}

UIColorExtensions.swift

//
//  UIColorExtensions.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/20/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import Foundation
import UIKit

extension UIColor {
	// MARK: - HEX value functions
	convenience init(hex: Int, alpha: CGFloat = 1.0) {
		let maxColorValue: CGFloat = 255.0
		let red = CGFloat((hex & 0xFF0000) >> 16) / maxColorValue
		let green = CGFloat((hex & 0xFF00) >> 8) / maxColorValue
		let blue = CGFloat((hex & 0xFF)) / maxColorValue
		self.init(red: red, green: green, blue: blue, alpha: alpha)
	}
}

UIControlExtensions.swift

//
//  UIControlExtensions.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/20/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import Foundation
import UIKit

extension UIControl {
	// MARK: - Control helper functions
	func disable() {
		enabled = false
	}

	func enable() {
		enabled = true
	}
}

UIImageExtensions.swift

//
//  UIImageExtensions.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/26/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import Foundation
import UIKit

extension UIImage {
	// MARK: - Color to image function
	class func imageFromColor(color: UIColor) -> UIImage {
		let imageRect = CGRectMake(0.0, 0.0, 1.0, 1.0)
		UIGraphicsBeginImageContext(imageRect.size)
		let context = UIGraphicsGetCurrentContext()
		CGContextSetFillColorWithColor(context, color.CGColor)
		CGContextFillRect(context, imageRect)
		let image = UIGraphicsGetImageFromCurrentImageContext()
		UIGraphicsEndImageContext()
		return image
	}
}

UIKitExtensions.swift

//
//  UIKitExtension.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/20/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import Foundation
import UIKit

class UIConstants {
	// MARK: - Screen dimension helpers
	class var screenBounds: CGRect {
		get {
			return UIScreen.mainScreen().applicationFrame
		}
	}

	class var screenCenter: CGPoint {
		get {
			return UIScreen.mainScreen().applicationFrame.center
		}
	}

	class var screenWidth: CGFloat {
		get {
			return UIScreen.mainScreen().applicationFrame.width
		}
	}

	class var screenHeight: CGFloat {
		get {
			return UIScreen.mainScreen().applicationFrame.height
		}
	}

	// MARK: - Status bar helpers
	class var statusBarHeight: CGFloat {
		get {
			return UIApplication.sharedApplication().statusBarFrame.height
		}
	}

	class var statusBarHidden: Bool {
		get {
			return UIApplication.sharedApplication().statusBarHidden
		}
		set (hidden) {
			UIApplication.sharedApplication().statusBarHidden = hidden
		}
	}
}

UINavigationBarExtensions.swift

//
//  UINavigationBarExtensions.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/26/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import Foundation
import UIKit

extension UINavigationBar {
	// MARK: - Hairline image view functions
	func hideBottomHairline() {
		let navigationBarImageView = hairlineImageViewInNavigationBar(self)
		navigationBarImageView!.hidden = true
	}

	func showBottomHairline() {
		let navigationBarImageView = hairlineImageViewInNavigationBar(self)
		navigationBarImageView!.hidden = false
	}

	private func hairlineImageViewInNavigationBar(view: UIView) -> UIImageView? {
		if view.isKindOfClass(UIImageView) && view.bounds.height <= 1.0 {
			return (view as UIImageView)
		}

		let subviews = (view.subviews as [UIView])
		for subview: UIView in subviews {
			if let imageView: UIImageView = hairlineImageViewInNavigationBar(subview)? {
				return imageView
			}
		}
		return nil
	}
}

UITableViewExtensions.swift

//
//  UITableViewExtensions.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/20/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import Foundation
import UIKit

extension UITableView {
	// MARK: - Scroll functions
	func scrollToBottom(animated: Bool = true) {
		let bottomOffset = CGPoint(x: 0, y: contentSize.height - bounds.height)
		setContentOffset(bottomOffset, animated: animated);
	}
}

UIToolbar.swift

//
//  UIToolbarExtensions.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/26/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import Foundation
import UIKit

extension UIToolbar {
	// MARK: - Hairline image view functions
	func hideHairline() {
		let navigationBarImageView = hairlineImageViewInToolbar(self)
		navigationBarImageView!.hidden = true
	}
	
	func showHairline() {
		let navigationBarImageView = hairlineImageViewInToolbar(self)
		navigationBarImageView!.hidden = false
	}

	private func hairlineImageViewInToolbar(view: UIView) -> UIImageView? {
		if view.isKindOfClass(UIImageView) && view.bounds.height <= 1.0 {
			return (view as UIImageView)
		}

		let subviews = (view.subviews as [UIView])
		for subview: UIView in subviews {
			if let imageView: UIImageView = hairlineImageViewInToolbar(subview)? {
				return imageView
			}
		}
		return nil
	}
}

UIViewExtensions.swift

//
//  UIViewExtensions.swift
//  MyDailyGrind
//
//  Created by Paris Pinkney on 7/20/14.
//  Copyright (c) 2014 PXPGraphics. All rights reserved.
//

import Foundation

extension UIView {
	// MARK: - Center views
	func centerHorizontally(parentWidth: CGFloat) {
		let xCenter = CGFloat(floor(Double(CGFloat(parentWidth - frame.width) / CGFloat(2.0))))
		self.frame = CGRect(x: xCenter, y: frame.origin.y, width: frame.width, height: frame.height)
	}

	// MARK: - Convert view to image
	func viewToImage() -> (image: UIImage, filePath: NSURL) {
		let image = viewToImageWithScale(0.0).image
		let filePath = viewToImageWithScale(0.0).filePath
		return (image, filePath)
	}

	func viewToImageWithScale(scale: CGFloat) -> (image: UIImage, filePath: NSURL) {
		let image = viewToImageWithScale(scale, legacy: false).image
		let filePath = viewToImageWithScale(scale, legacy: false).filePath
		return (image, filePath)
	}

	func viewToImageWithScale(scale: CGFloat, legacy: Bool) -> (image: UIImage, filePath: NSURL) {
		// If scale is 0.0, it'll follow the screen's scale for creating the bounds.
		UIGraphicsBeginImageContextWithOptions(bounds.size, false, scale)
		if legacy {
			layer.renderInContext(UIGraphicsGetCurrentContext())
		} else {
			drawViewHierarchyInRect(bounds, afterScreenUpdates: true)
		}

		// Get the image out of the context.
		let image = UIGraphicsGetImageFromCurrentImageContext()
		UIGraphicsEndImageContext()

		// Save the image to disk.
		let documentsDirectory = NSFileManager.applicationDocumentDirectory()
		var timestamp = "\(NSDate.date())"
		let characterSet = NSCharacterSet.alphanumericCharacterSet().invertedSet
		let components = (timestamp.componentsSeparatedByCharactersInSet(characterSet) as NSArray)
		timestamp = components.componentsJoinedByString("-")
		var path = documentsDirectory.path.stringByAppendingPathComponent("mydailygrind-img-\(timestamp).png.ig")
		let imageData = UIImagePNGRepresentation(image)
		imageData.writeToFile(path, atomically: true)
		let filePath = NSURL.fileURLWithPath(path)

		// Return the result.
		return (image, filePath)
	}
}