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// http://stackoverflow.com/questions/969130/how-to-print-out-the-method-name-and-line-number-and-conditionally-disable-nslog/969291#969291
#ifdef DEBUG
#   define DLog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)
#else
#   define DLog(...)
#endif

// ALog always displays output regardless of the DEBUG setting
#define ALog(fmt, ...) NSLog((@"%s [Line %d] " fmt), __PRETTY_FUNCTION__, __LINE__, ##__VA_ARGS__)

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// http://stackoverflow.com/questions/3599160/unused-parameter-warnings-in-c-code

#define UNUSED(x) (void)(x)

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#define OMNIA_SINGLETON_H(name)     + (instancetype)name;
#define OMNIA_SINGLETON_M(name)     + (instancetype)name { static dispatch_once_t onceToken; static id instance = nil; dispatch_once(&onceToken, ^{ instance = [[self alloc] init]; }); return instance; }

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// Taken from the commercial iOS PDF framework http://pspdfkit.com.
// Copyright (c) 2013 Peter Steinberger. All rights reserved.
// Licensed under MIT (http://opensource.org/licenses/MIT)
//
// You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it.

#import <objc/runtime.h>
#import <objc/message.h>

// Compile-time selector checks.

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//
//  NSArray+NegativeIndexes.m
//  Allow Negative Array Literals
//
//  Created by Matthew Robinson on 25th October 2012.
//  Copyright (c) 2012 Matthew Robinson. All rights reserved.
//
//  WARNING: This is a proof of concept and should not be used
//           in production code.  This could break at anytime.

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// http://stackoverflow.com/questions/9746417/keyboard-willshow-and-willhide-vs-rotation/14351009#14351009

- (void) keyboardWillShow:(NSNotification *)aNotification
{
     CGRect keyboardFrame = [[[aNotification userInfo] objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue];
    CGRect convertedFrame = [self.view convertRect:keyboardFrame fromView:self.view.window];

    ......
    /* Do whatever you want now with the new frame.
     * The width and height will actually be correct now

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- (void)switchRootViewController:(UIViewController *)viewController
                        animated:(BOOL)animated
                      completion:(void (^)())completion
{
    UIWindow *window = self.appDelegate.window;

    if (animated) {
        [UIView transitionWithView:window
                          duration:0.3
                           options:UIViewAnimationOptionTransitionCrossDissolve

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// FLEXUtitlity

+ (UIImage *)circularImageWithColor:(UIColor *)color radius:(CGFloat)radius
{
    CGFloat diameter = radius * 2.0;
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(diameter, diameter), NO, 0.0);
    CGContextRef imageContext = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(imageContext, [color CGColor]);
    CGContextFillEllipseInRect(imageContext, CGRectMake(0, 0, diameter, diameter));
    UIImage *circularImage = UIGraphicsGetImageFromCurrentImageContext();

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// SVProgressHUD

- (CGFloat)visibleKeyboardHeight {
        
    UIWindow *keyboardWindow = nil;
    for (UIWindow *testWindow in [[UIApplication sharedApplication] windows]) {
        if(![[testWindow class] isEqual:[UIWindow class]]) {
            keyboardWindow = testWindow;
            break;
        }

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FOUNDATION_EXPORT NSString *const NSKeyValueChangeKindKey;