NSMutableAttributedString - 没有边框的NSShadow

Question

I tried out NSMutableAttributedString to stylise my font with this code:

NSMutableAttributedString* attString = [[NSMutableAttributedString alloc] initWithString:element04.text];
    NSRange range = NSMakeRange(0, [attString length]);

    [attString addAttribute:NSFontAttributeName value:element04.font range:range];
    [attString addAttribute:NSForegroundColorAttributeName value:element04.textColor range:range];

    NSShadow* shadow = [[NSShadow alloc] init];
    shadow.shadowColor = [UIColor colorWithRed:30/255 green:11/255 blue:0/255 alpha:1];
    shadow.shadowOffset = CGSizeMake(2.0f, 2.0f);
    [attString addAttribute:NSShadowAttributeName value:shadow range:range];

    [attString addAttribute:NSStrokeColorAttributeName value:[UIColor colorWithRed:30/255 green:11/255 blue:0/255 alpha:1] range:range];
    [attString addAttribute:NSStrokeWidthAttributeName value:[NSNumber numberWithFloat:-2.0] range:range];

    element04.attributedText = attString;

The issue here is that there are border at the shadow. How can I add border to the text with the shadow that has no border?

Answer 1

It is certainly not what I would have expected. I suggest that you should file a bug report with Apple - though I suspect you'll be told this behavior is intentional. What's happening is that the stroke is casting a shadow of its own - and the weird part is that it is casting it on the fill , as if the layering order were:

• Stroke
• Shadow
• Fill (foreground color)

You can make this much less annoying (and indeed rather pleasing) by adding a little shadowBlurRadius . In the image below, I pretty much used your code, but added this:

shadow.shadowBlurRadius = 3;