设置UITextView,UILabel 中的文字加下划线

//添加下划线
-(NSAttributedString*) getAttributedString:(NSAttributedString*) attributedString isUnderline:(BOOL) isUnderline
{
    NSNumber *valuUnderline = [NSNumbernumberWithBool:isUnderline];
    NSRange rangeAll = NSMakeRange(0, attributedString.string.length);
    NSMutableAttributedString *as = [attributedString mutableCopy];
    [as beginEditing];
    [as addAttribute:NSUnderlineStyleAttributeNamevalue:valuUnderline range:rangeAll];
    [as endEditing];
    return as;
}

使用

textView.attributedText = [self getAttributedString:_mainTextView.attributedText isUnderline:YES];
label.attributedText =  [self getAttributedString:_mainTextView.attributedText isUnderline:YES];