iPhone4 8.3 系统下字体下方去除下划线

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NSMutableAttributedString *title = [[NSMutableAttributedString alloc] initWithString:@"先去看看"];

NSRange titleRange = {0,[title length]};
[title addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleNone] range:titleRange];
_goButton.titleLabel.textColor = LIGHTGRAYTEXT_COLOR;
_goButton.titleLabel.font = [UIFont systemFontOfSize:12];
[_goButton setAttributedTitle:title

forState:UIControlStateNormal];