Fuzzy lines when outlining text in UILabel

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I'm using a bit of code based on an answer I found here

- (void)drawTextInRect:(CGRect)rect {

    CGSize shadowOffset = self.shadowOffset;

    CGContextRef c = UIGraphicsGetCurrentContext();
    CGContextSetLineWidth(c, 3.5);
    CGContextSetLineJoin(c, kCGLineJoinRound);

    CGContextSetTextDrawingMode(c, kCGTextStroke);
    self.textColor = _outlineColor;
    [super drawTextInRect:rect];

    CGContextSetTextDrawingMode(c, kCGTextFill);
    self.textColor = _mainTextColor;
    self.shadowOffset = CGSizeMake(0, 0);
    [super drawTextInRect:rect];

    self.shadowOffset = shadowOffset;

}

My problem is that the text is a little bit fuzzy around the letters, particularly around the 'A' letters, as you can see here:

Does anyone know a way that I can clean this up? It seems small, but it really does stand out on the retina displays in particular.

asked 22 secs ago

Logan

3,222