Vertically align bar buttons inside toolbar - swift

Question

I am currently using the following code to display a datepicker when a user clicks on a UITextfield. This works fine, but the problem is there left and right button are not properly vertically center aligned. Is there any way to accomplish this? I tried using UIOffset on the buttons but without result.
private func setupDatePicker() {
let toolBar = UIToolbar(frame: CGRect(x: 0, y: self.view.frame.size.height/6,
width: self.view.frame.size.width, height: 40.0))
toolBar.layer.position = CGPoint(x: self.view.frame.size.width/2, y: self.view.frame.size.height-20.0)
toolBar.barStyle = UIBarStyle.blackTranslucent
toolBar.tintColor = UIColor.white
toolBar.backgroundColor = UIColor.black
let cancelBtn = UIBarButtonItem(title: "cancel".localized(lang: Localize.currentLanguage()), style: UIBarButtonItemStyle.plain, target: self,
action: #selector(tapppedToolBarBtn))
let okBarBtn = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.done, target: self,
action: #selector(donePressed))
let flexSpace = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace,
target: self, action: nil)
let label = UILabel(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width / 3,
height: self.view.frame.size.height))
label.font = UIFont(name: "Roboto-Regular", size: 12)
label.backgroundColor = UIColor.clear
label.textColor = UIColor.white
label.text = "selectdate".localized(lang: Localize.currentLanguage())
label.textAlignment = NSTextAlignment.center
let textBtn = UIBarButtonItem(customView: label)
toolBar.setItems([cancelBtn, flexSpace, textBtn, flexSpace, okBarBtn], animated: true)
startDateTxf.inputAccessoryView = toolBar
}
The result :
Result of the datepicker toolbar

Answer 1

I managed to fix this alignment issue by using the following code :
let toolBar = UIToolbar(frame: CGRect(x: 0, y: self.view.frame.size.height/6,
width: self.view.frame.size.width, height: 40.0))
toolBar.layer.position = CGPoint(x: self.view.frame.size.width/2, y: self.view.frame.size.height-20.0)
toolBar.barStyle = UIBarStyle.blackTranslucent
toolBar.tintColor = UIColor.white
toolBar.backgroundColor = UIColor.black
let cancelBtn1 = UIButton(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width / 4,
height: self.view.frame.size.height))
cancelBtn1.setTitle("cancel".localized(lang: Localize.currentLanguage()), for: .normal)
cancelBtn1.addTarget(self, action: #selector(tapppedToolBarBtn), for: .touchUpInside)
let cancelBtn = UIBarButtonItem(customView: cancelBtn1)
let okBarBtn1 = UIButton(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width / 4,
height: self.view.frame.size.height))
okBarBtn1.setTitle("Done", for: .normal)
okBarBtn1.addTarget(self, action: #selector(donePressed(sender:)), for: .touchUpInside)
let okBarBtn = UIBarButtonItem(customView: okBarBtn1)
let flexSpace = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace,
target: self, action: nil)
let label = UILabel(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width / 3,
height: self.view.frame.size.height))
label.font = UIFont(name: "Roboto-Regular", size: 12)
label.backgroundColor = UIColor.clear
label.textColor = UIColor.white
label.text = "selectdate".localized(lang: Localize.currentLanguage())
label.textAlignment = NSTextAlignment.center
let textBtn = UIBarButtonItem(customView: label)
toolBar.setItems([cancelBtn, flexSpace, textBtn, flexSpace, okBarBtn], animated: true)
startDateTxf.inputAccessoryView = toolBar
The result is : result in simulator