Reversed function of -[UIImage _flatImageWithColor:] on iOS 7+

FlatImageWithColor.m

#import <UIKit/UIKit.h>

@interface UIImage (FlatImageWithColor)
- (UIImage *)_flatImageWithColor:(UIColor *)color;
@end

@implementation UIImage (FlatImageWithColor)

- (UIImage *)_flatImageWithColor:(UIColor *)color {
  UIImage *flatImage = nil;
  CGSize imageSize = self.size;
  CGFloat scale = self.scale;
  UIGraphicsBeginImageContextWithOptions(imageSize, NO, scale);
  if (UIGraphicsGetCurrentContext()) {
    [color set];
    UIRectFill(CGRectMake(0, 0, imageSize.width, imageSize.height));
    [self drawAtPoint:CGPointZero blendMode:kCGBlendModeDestinationIn alpha:1.0];
    flatImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    if ([self _isResizable])
      flatImage = [flatImage resizableImageWithCapInsets:self.capInsets];
    if (self->_flipsForRightToLeftLayoutDirection) // iOS 9+
      flatImage = [flatImage imageFlippedForRightToLeftLayoutDirection];
    if ([self _vectorImageCGPDFPage]) { // ?
      if (!self.imageOrientation) {
        [self configureVectorImagePropertiesForImage:flatImage];
        [flatImage _setVectorImageFlatColor:color];
        return flatImage;
      }
    }
  }
  return flatImage;
}

@end