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NULL	(void *)0	literal null value for C pointers
nil	(id)0	literal null value for Objective-C objects
Nil	(Class)0	literal null value for Objective-C classes
NSNull	[NSNull null]	singleton object used to represent null

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#pragma clang diagnostic push
    // Code that produces warnings
#pragma clang diagnostic pop

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- (void)method
{
    CGPoint velocity = [sender translationInView:view];

    if (sender.state == UIGestureRecognizerStateEnded)
    {
        if (velocity.x > 0)
        {
            [self switchedCarsWithDirection:LEFT];
        }

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[navigationBar setBackgroundImage:[UIImage imageNamed:@"image"] forBarMetrics:UIBarMetricsDefault];

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#define WINDOW_WIDTH [[UIScreen mainScreen] bounds].size.width
#define WINDOW_HEIGHT [[UIScreen mainScreen] bounds].size.height

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UIImage *buttonImage = [UIImage imageNamed:@"image"];
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.frame = CGRectMake(0, 0, 50, 44);
        [button setImage:buttonImage forState:UIControlStateNormal];
        [button addTarget:self
                   action:@selector(nil)
         forControlEvents:UIControlEventTouchUpInside];
        UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
        self.navigationItem.rightBarButtonItem = barButtonItem;

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NSString *numberWithCommas = [NSNumberFormatter localizedStringFromNumber:@(intNumber)
                                                       numberStyle:NSNumberFormatterDecimalStyle];

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+ (AppDelegate *)instance
{
    return (AppDelegate *)[UIApplication sharedApplication].delegate;
}

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//Adds a shadow to sampleView
CALayer *layer = self.sampleView.layer;
layer.shadowOffset = CGSizeMake(1, 1);
layer.shadowColor = [[UIColor blackColor] CGColor];
layer.shadowRadius = 4.0f;
layer.shadowOpacity = 0.80f;
layer.shadowPath = [[UIBezierPath bezierPathWithRect:layer.bounds] CGPath];

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NSString *mapsURL = @"http://maps.google.com/maps?q=";
    if ([[[[UIDevice currentDevice] systemVersion] substringToIndex:1] intValue] >= 6) // if iOS 6 or greater use apple maps
    {
        mapsURL = @"http://maps.apple.com/maps?q=";
    }
    NSString *mapaddress = [mapsURL stringByAppendingString:address];
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[mapaddress stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]]];