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override func loadView() {
		super.loadView()
		
		...
		
		let nibName = someCondition ? "OneXIB" : "AnotherXIB"
		let nib = UINib(nibName: nibName, bundle: nil)
		nib.instantiateWithOwner(self, options: nil)
	}

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NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;
NSArray *documents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:basePath error:nil];
NSURL *URL;
NSString *completeFilePath;
for (NSString *file in documents) {
	completeFilePath = [NSString stringWithFormat:@"%@/%@", basePath, file];
	URL = [NSURL fileURLWithPath:completeFilePath];
	NSLog(@"File %@  is excluded from backup %@", file, [URL resourceValuesForKeys:[NSArray arrayWithObject:NSURLIsExcludedFromBackupKey] error:nil]);
}

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let directories = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true)
if let documentDirectory = directories.first {
	do {
		let documents = try NSFileManager.defaultManager().contentsOfDirectoryAtPath(documentDirectory)
		for files in documents {
			let urlForm = NSURL.fileURLWithPath(documentDirectory + "/" + files)
			do {
				try print("\(files): \(urlForm.resourceValuesForKeys([NSURLIsExcludedFromBackupKey]))")
			} catch {
				print("can't find key")

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import UIKit

class CenterViewFlowLayout: UICollectionViewFlowLayout {
	
	override func collectionViewContentSize() -> CGSize {
		// Only support single section for now.
		// Only support Horizontal scroll
		let count = self.collectionView?.dataSource?.collectionView(self.collectionView!, numberOfItemsInSection: 0)
		let canvasSize = self.collectionView!.frame.size
		var contentSize = canvasSize

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#
# c.f. StackOverflow question/answer here: http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4
#
# Version 2.5
#
# Latest Change:
# - The "copy headers" section now respects the build setting for the location of the public headers
# - Opens the directory with the universal library after build (Can be annoying)
# 
# Purpose:

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let login = "test"
let password = "12345"

let url = NSURL(string: "http://test.com/api/v1/example.json")
let request = NSMutableURLRequest(URL: url!)

let config = NSURLSessionConfiguration.defaultSessionConfiguration()
let userPasswordString = "\(login):\(password)"
let userPasswordData = userPasswordString.dataUsingEncoding(NSUTF8StringEncoding)
let base64EncodedCredential = userPasswordData!.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0))

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import Foundation

extension String {

	func isValidEmail() -> Bool {
		let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
		let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
		return emailTest.evaluateWithObject(self)
	}

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import SystemConfiguration

public class Reachability {
	
	class func isConnectedToNetwork() -> Bool {
		var zeroAddress = sockaddr_in()
		zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
		zeroAddress.sin_family = sa_family_t(AF_INET)
		let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
			SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))

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extension NSLayoutConstraint {
	
	func setMultiplier(multiplier:CGFloat) -> NSLayoutConstraint {
		
		let newConstraint = NSLayoutConstraint(
			item: firstItem,
			attribute: firstAttribute,
			relatedBy: relation,
			toItem: secondItem,
			attribute: secondAttribute,

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let image = UIImage(named: "example")
let instagramURL = NSURL(string: "instagram://app")
if UIApplication.sharedApplication().canOpenURL(instagramURL!) {
	let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
	let saveImagePath = (documentsPath as NSString).stringByAppendingPathComponent("Image.igo")
	let imageData = UIImagePNGRepresentation(image!)
	do {
		try imageData?.writeToFile(saveImagePath, options: NSDataWritingOptions(rawValue: 0))
	} catch {
		print("Instagram sharing error")