Label字间间隔

- (void)Address{
    NSMutableAttributedString * attributedString1 = [[NSMutableAttributedString alloc] initWithString:_testString];
    NSMutableParagraphStyle * paragraphStyle1 = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle1 setLineSpacing:15];
    [attributedString1 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle1 range:NSMakeRange(0, [_testString length])];
    [_cLabel setAttributedText:attributedString1];
    [_cLabel sizeToFit];
}