[obcj] UIButton, underline

NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:@"ボタン"];

    NSDictionary *attributes = @{                                 NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle)};

    [attrStr addAttributes:attributes

                     range:NSMakeRange(0, attrStr.length)];

    

    [self.btn setAttributedTitle:attrStr forState:UIControlStateNormal];