Added Objective-C port of ASAttributedLabelNode

ASAttributedLabelNode.h

@@ -0,0 +1,16 @@
+//
+//  ASAttributedLabelNode.h
+//
+//  Created by Peter Easdown on 27/11/16.
+//  Inspired by Alex Studnicka
+//
+
+#import <SpriteKit/SpriteKit.h>
+
+@interface ASAttributedLabelNode : SKSpriteNode
+
+@property (nonatomic, retain) NSAttributedString *attributedText;
+
+- (id) initWithSize:(CGSize)size;
+
+@end

ASAttributedLabelNode.m

@@ -0,0 +1,61 @@
+//
+//  ASAttributedLabelNode.h
+//
+//  Created by Peter Easdown on 27/11/16.
+//  Inspired by Alex Studnicka
+//
+
+#import "ASAttributedLabelNode.h"
+
+@implementation ASAttributedLabelNode
+
+- (id) initWithSize:(CGSize)size {
+    self = [super initWithColor:[UIColor clearColor] size:size];
+
+    return self;
+}
+
+- (void) setAttributedText:(NSAttributedString *)attributedText {
+    _attributedText = attributedText;
+
+    [self draw];
+}
+
+- (void) draw {
+    NSAttributedString *attrStr = self.attributedText;
+
+    if (attrStr == nil) {
+        self.texture = nil;
+
+        return;
+    }
+
+    float scaleFactor = [UIScreen mainScreen].scale;
+    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
+    CGImageAlphaInfo bitmapInfo = kCGImageAlphaPremultipliedLast;
+    CGContextRef context = CGBitmapContextCreate(nil, self.size.width * scaleFactor, self.size.height * scaleFactor, 8, 0, colorSpace, bitmapInfo);
+
+    if (context == nil) {
+        return;
+    }
+
+    CGContextScaleCTM(context, scaleFactor, scaleFactor);
+    CGContextConcatCTM(context, CGAffineTransformMake(1, 0, 0, -1, 0, self.size.height));
+    UIGraphicsPushContext(context);
+
+    float strHeight = [attrStr boundingRectWithSize:self.size options:NSStringDrawingUsesLineFragmentOrigin context:nil].size.height;
+    float yOffset = (self.size.height - strHeight) / 2.0;
+    CGRect rect = CGRectMake(0.0, yOffset, self.size.width, strHeight);
+    [attrStr drawWithRect:rect options:NSStringDrawingUsesLineFragmentOrigin context:nil];
+
+    CGImageRef imageRef = CGBitmapContextCreateImage(context);
+
+    if (imageRef != nil) {
+        self.texture = [SKTexture textureWithCGImage:imageRef];
+        CGImageRelease(imageRef);
+    }
+
+    UIGraphicsPopContext();
+}
+
+@end