implementing toolbar fo my UITextField in UITableViewCell using protocols in swift - swift

Question

How to implement this code inside a Protocol in order to achieve Protocol Oriented Programing? One big problem is settling the #objc method, which are not allowed in protocols. Second one is this code is now used for UITextField inside many cells, that's why I extend UIView and why I corrected endediting
original code found here
//used inside a cell with a UITextField
extension UIView {
func toolBar() -> UIToolbar{
let toolBar = UIToolbar()
toolBar.barStyle = .default
toolBar.isTranslucent = true
toolBar.barTintColor = UIColor.init(red: 0/255, green: 25/255, blue: 61/255, alpha: 1)
let space = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
let buttonTitle = "Done"
let cancelButtonTitle = "Cancel"
let doneButton = UIBarButtonItem(title: buttonTitle, style: .done, target: self, action: #selector(onClickDoneButton))
let cancelButton = UIBarButtonItem(title: cancelButtonTitle, style: .plain, target: self, action: #selector(onClickCancelButton))
doneButton.tintColor = .white
cancelButton.tintColor = .white
toolBar.setItems([cancelButton, space, doneButton], animated: false)
toolBar.isUserInteractionEnabled = true
toolBar.sizeToFit()
return toolBar
}
#objc func onClickDoneButton(){
// view.endEditing(true)
self.endEditing(true)
}
#objc func onClickCancelButton(){
// view.endEditing(true)
self.endEditing(true)
}
}
EDIT on Sandeep Bhandari's answer this is the working implementation
first I added a file with
extension UIView: ToolBarProtocol {}
then inside my cell now I have:
let selDone = #selector(onClickDoneButton)
let selCancel = #selector(onClickCancelButton)
self.cellTextfield.inputAccessoryView = toolBar(with: selDone, cancelSeclector: selCancel)
#objc func onClickDoneButton() {
self.endEditing(true)
}
#objc func onClickCancelButton() {
self.endEditing(true)
}

Answer 1

Best you can do I guess is
protocol ToolBarProtocol where Self: UIView {
func toolBar(with doneSelector: Selector?, cancelSeclector: Selector?) -> UIToolbar
}
extension ToolBarProtocol {
func toolBar(with doneSelector: Selector?, cancelSeclector: Selector?) -> UIToolbar{
let toolBar = UIToolbar()
toolBar.barStyle = .default
toolBar.isTranslucent = true
toolBar.barTintColor = UIColor.init(red: 0/255, green: 25/255, blue: 61/255, alpha: 1)
let space = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
let buttonTitle = "Done"
let cancelButtonTitle = "Cancel"
let doneButton = UIBarButtonItem(title: buttonTitle, style: .done, target: self, action: doneSelector)
let cancelButton = UIBarButtonItem(title: cancelButtonTitle, style: .plain, target: self, action: cancelSeclector)
doneButton.tintColor = .white
cancelButton.tintColor = .white
toolBar.setItems([cancelButton, space, doneButton], animated: false)
toolBar.isUserInteractionEnabled = true
toolBar.sizeToFit()
return toolBar
}
}
In nutshell You can't provide a default extension to #objc protocol.
What does it have to do with this problem?
You cant provide a default extension to your done and cancel button selectors, because they will need to be annotated with #objc (Typical selector signature is selector(#objc method)) and as soon as you add #objc to them then compiler will give you a compilation error
#objc can only be used with members of classes, #objc protocols, and
concrete extension of classes
so to make your protocol compatible with #objc function you will endup making it #objc protocol, and if you make a protocol #objc you cant provide a default extension to that
For more details refer: Swift protocol extension in Objective-C class