Add utility method for generating thumbnails from image data.

Classes/Utility/FLEXUtility.h

@@ -30,5 +30,6 @@
 + (UIInterfaceOrientationMask)infoPlistSupportedInterfaceOrientationsMask;
 + (NSString *)searchBarPlaceholderText;
 + (BOOL)isImagePathExtension:(NSString *)extension;
++ (UIImage *)thumbnailedImageWithMaxPixelDimension:(NSInteger)dimension fromImageData:(NSData *)data;
 
 @end

Classes/Utility/FLEXUtility.m

@@ -8,6 +8,7 @@
 
 #import "FLEXUtility.h"
 #import "FLEXResources.h"
+#import <ImageIO/ImageIO.h>
 
 @implementation FLEXUtility
 
@@ -183,4 +184,23 @@
     return [@[@"jpg", @"jpeg", @"png", @"gif", @"tiff", @"tif"] containsObject:extension];
 }
 
++ (UIImage *)thumbnailedImageWithMaxPixelDimension:(NSInteger)dimension fromImageData:(NSData *)data
+{
+    UIImage *thumbnail = nil;
+    CGImageSourceRef imageSource = CGImageSourceCreateWithData((__bridge CFDataRef)data, 0);
+    if (imageSource) {
+        NSDictionary *options = @{ (__bridge id)kCGImageSourceCreateThumbnailWithTransform : @YES,
+                                   (__bridge id)kCGImageSourceCreateThumbnailFromImageAlways : @YES,
+                                   (__bridge id)kCGImageSourceThumbnailMaxPixelSize : @(dimension) };
+
+        CGImageRef scaledImageRef = CGImageSourceCreateThumbnailAtIndex(imageSource, 0, (__bridge CFDictionaryRef)options);
+        if (scaledImageRef) {
+            thumbnail = [UIImage imageWithCGImage:scaledImageRef];
+            CFRelease(scaledImageRef);
+        }
+        CFRelease(imageSource);
+    }
+    return thumbnail;
+}
+
 @end