cwagdev

func luhnCheck(number: String) -> Bool {
    var sum = 0
    let digitStrings = reverse(number).map { String($0) }
    
    for tuple in enumerate(digitStrings) {
        if let digit = tuple.element.toInt() {
            let odd = tuple.index % 2 == 1
            
            switch (odd, digit) {
            case (true, 9):

cwagdev

// Variables used by Scriptable.
// These must be at the very top of the file. Do not edit.
// icon-color: brown; icon-glyph: magic;
// Show a random MTG Card

const { transparent } = importModule('no-background')

let card = await randomCard()
let widget = await createWidget(card)

cwagdev

/// Describes a type of credit card for a subset of known types.
enum CreditCardType: Printable {
    case Amex, DinersClub, Discover, JCB, MasterCard, Visa, Unknown
    
    var description: String {
        switch self {
        case .Amex:
            return "Amex"
        case .DinersClub:
            return "Diners Club"

cwagdev

import UIKit
import CoreData

class BasicFetchedResultsControllerDelegate: NSObject, NSFetchedResultsControllerDelegate {
    let tableView: UITableView
    var controllerDidChangeContentCallback: (() -> Void)?
    
    /// The threshold for the number of inserts, deletes, and reloads to peform using animations. If the threshold is exceeded, the table will be reloaded using `reloadData()`. The default value is `50`.
    var numberOfRowOperationsThresholdBeforeFullReloadOccurs = 50
    

cwagdev

extension UIImage {
    convenience init!(color: UIColor, size: CGSize = CGSize(width: 1, height: 1)) {
        let rect = CGRect(x: 0, y: 0, width: size.width, height: size.height)
        UIGraphicsBeginImageContext(rect.size)
        let context = UIGraphicsGetCurrentContext()
        
        CGContextSetFillColorWithColor(context, color.CGColor)
        CGContextFillRect(context, rect)
        
        let image = UIGraphicsGetImageFromCurrentImageContext()

cwagdev

#import <UIKit/UIKit.h>

@interface UIColor (Grayscale)

- (UIColor *)grayscale;

@end

cwagdev

// Swift 2.2
let queue = dispatch_queue_create("myqueue", nil)
dispatch_async(queue) { 
  // do stuff
}
 
// Swift 3
let queue = DispatchQueue(label: "myqueue")
queue.async { 
  // do stuff

cwagdev

#define SYSTEM_VERSION_EQUAL_TO(v)                  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v)              ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v)                 ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v)     ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)

cwagdev

- (void)viewDidLoad {
    [super viewDidLoad];
	  
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardShowNotification:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboardHideNotification:) name:UIKeyboardWillHideNotification object:nil];
}

- (void)dealloc {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

cwagdev

- (void)viewWillDisappear:(BOOL)animated {
    if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
       // back button was pressed.  We know this is true because self is no longer
       // in the navigation stack.  
    }
    [super viewWillDisappear:animated];
}