UIbutton 下划线 字体 颜色

        btn = [[UIButton alloc] init];
        NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"申请官方客服介入"];
        NSRange strRange = {0, [str length]};
        [str addAttribute:NSForegroundColorAttributeName value:色 range:strRange]; // 字体
        [str addAttribute:NSUnderlineColorAttributeName value:色 range:strRange]; // 下划线
        [str addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger : NSUnderlineStyleSingle] range:strRange];
        [btn setAttributedTitle:str forState:UIControlStateNormal];