modify the alpha of a referenced color

if you reference a color, e.g. “COLOR1”  = “255,0,0,1”, “COLOR2” =
“COLOR1” you can now append “:[alpha]” to the reference to modify it’s
alpha, e.g. “COLOR2” = “COLOR1:0.2” will equate to “255,0,0,0.2”

Author: jacobjrapoport

AWLThemeManager/AWLThemeManager.m

@@ -88,7 +88,12 @@ - (UIColor *)colorForKey:(NSString *)key forTheme:(NSString *)themeName
     NSString *colorValue = [self objectForKey:key forTheme:themeName];
     UIColor *color = [self colorFromString:colorValue];
     if (color == nil && [self isValidString:colorValue]) {
+        NSArray* referenceColor = [colorValue componentsSeparatedByString: @":"];
+        colorValue = referenceColor.firstObject;
         color = [self colorForKey:colorValue forTheme:themeName];
+        if (referenceColor.count > 1) {
+            color = [color colorWithAlphaComponent: [referenceColor[1] floatValue]];
+        }
     }
 
     return color;