Adding color categories: #2

KGNoise.h

@@ -22,6 +22,20 @@
 
 @end
 
+#pragma mark - KGNoise Color
+
+#if TARGET_OS_IPHONE
+@interface UIColor(KGNoise)
+- (UIColor *)colorWithNoiseWithOpacity:(CGFloat)opacity;
+- (UIColor *)colorWithNoiseWithOpacity:(CGFloat)opacity andBlendMode:(CGBlendMode)blendMode;
+@end
+#else
+@interface NSColor(KGNoise)
+- (NSColor *)colorWithNoiseWithOpacity:(CGFloat)opacity;
+- (NSColor *)colorWithNoiseWithOpacity:(CGFloat)opacity andBlendMode:(CGBlendMode)blendMode;
+@end
+#endif
+
 #pragma mark - KGNoiseView
 
 #if TARGET_OS_IPHONE

KGNoise.m

@@ -8,6 +8,8 @@
 
 #import "KGNoise.h"
 
+static NSUInteger const kImageSize = 128;
+
 #if TARGET_OS_IPHONE
 CGFloat *gradientComponentsForColors(UIColor *color1, UIColor *color2){
 #else
@@ -54,7 +56,7 @@ + (void)drawNoiseWithOpacity:(CGFloat)opacity andBlendMode:(CGBlendMode)blendMod
     static CGImageRef noiseImageRef = nil;
     static dispatch_once_t oncePredicate;
     dispatch_once(&oncePredicate, ^{
-        NSUInteger width = 128, height = width;
+        NSUInteger width = kImageSize, height = width;
         NSUInteger size = width*height;
         char *rgba = (char *)malloc(size); srand(115);
         for(NSUInteger i=0; i < size; ++i){rgba[i] = rand()%256;}
@@ -96,6 +98,42 @@ + (void)drawNoiseWithOpacity:(CGFloat)opacity andBlendMode:(CGBlendMode)blendMod
 
 @end
 
+#pragma mark - KGNoise Color
+
+#if TARGET_OS_IPHONE
+@implementation UIColor(KGNoise)
+- (UIColor *)colorWithNoiseWithOpacity:(CGFloat)opacity{
+    return [self colorWithNoiseWithOpacity:opacity andBlendMode:kCGBlendModeScreen];
+}
+- (UIColor *)colorWithNoiseWithOpacity:(CGFloat)opacity andBlendMode:(CGBlendMode)blendMode{
+    CGRect rect = {CGPointZero, kImageSize, kImageSize};
+    UIGraphicsBeginImageContextWithOptions(rect.size, YES, 0.0f);
+    CGContextRef context = UIGraphicsGetCurrentContext();
+    [self setFill]; CGContextFillRect(context, rect);
+    [KGNoise drawNoiseWithOpacity:opacity andBlendMode:blendMode];
+    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
+    UIGraphicsEndImageContext();
+    return [UIColor colorWithPatternImage:image];
+}
+@end
+#else
+@implementation NSColor(KGNoise)
+- (NSColor *)colorWithNoiseWithOpacity:(CGFloat)opacity{
+    return [self colorWithNoiseWithOpacity:opacity andBlendMode:kCGBlendModeScreen];    
+}
+- (NSColor *)colorWithNoiseWithOpacity:(CGFloat)opacity andBlendMode:(CGBlendMode)blendMode{
+    CGRect rect = {CGPointZero, kImageSize, kImageSize};
+    NSImage *image = [[NSImage alloc] initWithSize:rect.size];
+    [image lockFocus];
+    CGContextRef context = [[NSGraphicsContext currentContext] graphicsPort];  
+    [self setFill]; CGContextFillRect(context, rect);
+    [KGNoise drawNoiseWithOpacity:opacity andBlendMode:blendMode];
+    [image unlockFocus];
+    return [NSColor colorWithPatternImage:image];
+}
+@end
+#endif
+
 #pragma mark - KGNoiseView
 
 @implementation KGNoiseView

readme.md

@@ -25,6 +25,13 @@ KGNoise is distributed under the MIT license, see the license file for more info
 + (void)drawNoiseWithOpacity:(CGFloat)opacity andBlendMode:(CGBlendMode)blendMode;
 ```
 
+# UIColor/NSColor(KGNoise)
+
+```
+- (NSColor/UIColor *)colorWithNoiseWithOpacity:(CGFloat)opacity;
+- (NSColor/UIColor *)colorWithNoiseWithOpacity:(CGFloat)opacity andBlendMode:(CGBlendMode)blendMode;
+```
+
 # KGNoiseView
 
 There is also a subclass of `NSView` or `UIView`, depending on your platform, that you can use out of the box to draw noise on a solid color. The noise opacity, blending mode, and background color are all customizable.