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PONSAttributedString Color Test
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  1. PONSAttributedString Color Test
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    copied!<p>What is the correct way to compare, or test, for a particular color attribute of an NSAttributed string?</p> <p>As an example, I'd like to know if the text selection has red text. I have tried several approaches, as you can see below, but none of them ever results in a match. I see the text turn red on screen, and logging the attribute returns: UIDeviceRGBColorSpace 1 0 0 1</p> <pre><code>- (BOOL)isRedWithAttributes:(NSDictionary *)attributes { BOOL isRedWithAttributes = NO; if (attributes != nil) { // if ( [attributes objectForKey:NSForegroundColorAttributeName] == [UIColor redColor] ) // if ( [attributes objectForKey:NSForegroundColorAttributeName] == @"UIDeviceRGBColorSpace 1 0 0 1" ) if ( [attributes objectForKey:NSForegroundColorAttributeName] == [UIColor colorWithRed:1 green:0 blue:0 alpha:1] ) { isRedWithAttributes = YES; } else { isRedWithAttributes = NO; } } return isRedWithAttributes; } </code></pre> <p>Here is how I pass the attribute for the test:</p> <pre><code>NSAttributedString *selectedString = [attributedString attributedSubstringFromRange:selectedRange]; [selectedString enumerateAttributesInRange:NSMakeRange(0, [selectedString length]) options:NSAttributedStringEnumerationLongestEffectiveRangeNotRequired usingBlock:^(NSDictionary *attributes, NSRange range, BOOL *stop) { UIFont *fontFace = [attributes objectForKey:NSFontAttributeName]; BOOL isRedWithAttributes = [fontFace isRedWithAttributes:attributes]; if (isRedWithAttributes) { NSLog(@"detected red. set selected"); [self.redButton setSelected:YES]; } else { NSLog(@"detected not red. do not set selected"); [self.redButton setSelected:NO]; } } </code></pre> <p>I don't think it matters, but for completeness, here is how I set the text to be red.</p> <pre><code>NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithAttributedString:self.synopsisTextView.attributedText]; [attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:selectedRange]; self.synopsisTextView.attributedText = attributedString; </code></pre>
 

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