UILabel字体描边

- (void)drawTextInRect:(CGRect)rect {

CGSize shadowOffset = self.shadowOffset;
UIColor *textColor = self.textColor;

CGContextRef c = UIGraphicsGetCurrentContext();
CGContextSetLineWidth(c, 1);
CGContextSetLineJoin(c, kCGLineJoinRound);

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

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

self.shadowOffset = shadowOffset;

}