Add colorWithPatternImage support

Now if you specify as color as “#[ImageName]” it will search for the
“Foo” image using the usual methods & if found, return a color using
that image as a pattern. To change the alpha, use
“#[ImageName],[Alpha]” e.g. #Foo,0.3

Author: jrapoport

AWLThemeManager/AWLThemeManager.m

@@ -86,7 +86,7 @@ - (UIColor *)colorForKey:(NSString *)key forTheme:(NSString *)themeName
     }
 
     NSString *colorValue = [self objectForKey:key forTheme:themeName];
-    UIColor *color = [self colorFromString:colorValue];
+    UIColor *color = [self colorFromString:colorValue forTheme: themeName];
     if (color == nil && [self isValidString:colorValue]) {
         NSArray* referenceColor = [colorValue componentsSeparatedByString:@":"];
         colorValue = referenceColor.firstObject;
@@ -99,9 +99,23 @@ - (UIColor *)colorForKey:(NSString *)key forTheme:(NSString *)themeName
     return color;
 }
 
-- (UIColor*)colorFromString:(NSString*)colorValue
+- (UIColor*)colorFromString:(NSString*)colorValue forTheme:(NSString *)themeName
 {
     if ([self isValidString:colorValue]) {
+        
+        if ([colorValue hasPrefix: @"#"]) {
+            NSArray*  array       = [colorValue componentsSeparatedByString:@","];
+            NSString* patternName = [array[0] substringFromIndex:1];
+            UIImage* patternImage = [self imageNamed:patternName forTheme:themeName];
+            if (patternImage == nil) {
+                return nil;
+            }
+            UIColor* color = [UIColor colorWithPatternImage: patternImage];
+            if (array.count == 2) {
+                color = [color colorWithAlphaComponent: [array[1] doubleValue]];
+            }
+            return color;
+        }
         NSArray* array = [colorValue componentsSeparatedByString:@","];
         if (array && [array count] == 2) {
             return [UIColor colorWithWhite:[array[0] doubleValue]