Dropdown

drop = UIDropDown(frame: CGRect(x: 0, y: 0, width: 60, height: 20))
drop.tintColor = UIColor.blueColor()
drop.backgroundColor = UIColor.redColor()
drop.options = ["VND","USD","THB","JPY","RUB","EUR"]
drop.placeholder = "VND"
drop.delegate = self
self.addSubview(drop)
drop.snp_makeConstraints { (make) -> Void in
make.leading.equalTo(label.snp_trailing).offset(5)
make.centerY.equalTo(label.snp_centerY).offset(-10)
}