ios – NSAttributedString颜色测试

作为一个例子,我想知道文本选择是否有红色文本.我已经尝试了几种方法,如下所示,但它们都没有产生匹配.我看到文本在屏幕上变为红色,并且记录该属性返回：UIDeviceRGBColorSpace 1 0 0 1

- (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;
}

以下是我为测试传递属性的方法：

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];
            }
}

我认为这不重要,但为了完整起见,我将如何将文本设置为红色.

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithAttributedString:self.synopsisTextView.attributedText];
[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:selectedRange];
self.synopsisTextView.attributedText = attributedString;