UILab添加类别扩展方法行间距和字间距

- (void)setColumnSpace:(CGFloat)columnSpace
{
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
    //调整间距
    [attributedString addAttribute:(__bridge NSString *)kCTKernAttributeName value:@(columnSpace) range:NSMakeRange(0, [attributedString length])];
    self.attributedText = attributedString;
}

- (void)setRowSpace:(CGFloat)rowSpace
{
    self.numberOfLines = 0;
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
    //调整行距
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.lineSpacing = rowSpace;
    paragraphStyle.baseWritingDirection = NSWritingDirectionLeftToRight;
    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [self.text length])];
    self.attributedText = attributedString;
}