Add UIToolBar to all keyboards (swift)

问题

I'm trying to add a custom UIToolBar to all of my keyboards with as little repetition. The way I'm currently doing it requires me to add the code to all my viewDidLoads and assign every textfield's delegate to the viewController I'm using. I have tried creating my own UIToolBar subclass but I find that I can't really do that when the target for my "Done" and "cancel" buttons are the self view. Does anyone have any suggestions for creating an easily reusable toolbar? Thanks in advance.

override func viewDidLoad() {
    super.viewDidLoad()

    var toolBar = UIToolbar()
    toolBar.barStyle = UIBarStyle.Default
    toolBar.translucent = true
    toolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)
    var doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Done, target: self, action: "donePressed")
    var cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.Plain, target: self, action: "cancelPressed")
    var spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil)
    toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)
    toolBar.userInteractionEnabled = true
    toolBar.sizeToFit()

    stateField.inputAccessoryView = toolBar
    stateField.delegate = self

回答1:

Thanks to Glorfindel's suggestion and ncerezo's sample code I solved my problem using extensions.

extension UIViewController: UITextFieldDelegate{
    func addToolBar(textField: UITextField){
        var toolBar = UIToolbar()
        toolBar.barStyle = UIBarStyle.Default
        toolBar.translucent = true
        toolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)
        var doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Done, target: self, action: "donePressed")
        var cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.Plain, target: self, action: "cancelPressed")
        var spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil)
        toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)
        toolBar.userInteractionEnabled = true
        toolBar.sizeToFit()

        textField.delegate = self
        textField.inputAccessoryView = toolBar
    }
    func donePressed(){
        view.endEditing(true)
    }
    func cancelPressed(){
        view.endEditing(true) // or do something
    }
}

Though I still need to call the code below on all of my textfields. I feel like there may be a better way without having to call the function on every textField, but for now this is definitely more reusable.

override func viewDidLoad() {
    super.viewDidLoad()
    addToolBar(addressField)
}

回答2:

equivalent of vivian version in swift 3:

extension UIViewController: UITextFieldDelegate {
    func addToolBar(textField: UITextField) {
        let toolBar = UIToolbar()
        toolBar.barStyle = .default
        toolBar.isTranslucent = true
        toolBar.tintColor = UIColor(red: 76 / 255, green: 217 / 255, blue: 100 / 255, alpha: 1)
        let doneButton = UIBarButtonItem(title: "Done", style: .done, target: self, action: #selector(donePressed))
        let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelPressed))
        let spaceButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
        toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)


        toolBar.isUserInteractionEnabled = true
        toolBar.sizeToFit()

        textField.delegate = self
        textField.inputAccessoryView = toolBar
    }

    func donePressed() {
        view.endEditing(true)
    }

    func cancelPressed() {
        view.endEditing(true) // or do something
    }
}

回答3:

For swift 4 you can use this:-

extension Login_VC : UITextFieldDelegate {
    func addToolBar(textField: UITextField){
        var toolBar = UIToolbar()
        toolBar.barStyle = UIBarStyle.default
        toolBar.isTranslucent = true
        toolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)
        var doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.done, target: self, action: "donePressed")
        var cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.plain, target: self, action: "cancelPressed")
        var spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
        toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)
        toolBar.isUserInteractionEnabled = true
        toolBar.sizeToFit()

        textField.delegate = self
        textField.inputAccessoryView = toolBar
    }
    func donePressed(){
        view.endEditing(true)
    }
    func cancelPressed(){
        view.endEditing(true) // or do something
    }
}

回答4:

I have an utility that I've been using some time (ported to Swift from Objective-C) that does this and a little more, you might find it useful:

https://github.com/ncerezo/SwiftKeyboardAccessory

It creates a toolbar with at least a "Done" button to dismiss the keyboard, and optionally Next and Previous buttons. It also takes care of dismissing the keyboard when you tap outside the text field, and of resizing and scrolling the view when the keyboard appears or disappears. It's designed to work with UITableVIew and also with UIScrollView.

回答5:

You can make a UIToolbar subclass work by taking advantage of the responder chain. No need to change your view controllers. In Swift 3:

class KeyboardAccessoryToolbar: UIToolbar {
    convenience init() {
        self.init(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 50))
        self.barStyle = .default
        self.isTranslucent = true
        self.tintColor = UIColor(red: 76 / 255, green: 217 / 255, blue: 100 / 255, alpha: 1)

        let doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(self.done))
        let cancelButton = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(self.cancel))
        let spaceButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
        self.items = [cancelButton, spaceButton, doneButton]

        self.isUserInteractionEnabled = true
        self.sizeToFit()
    }

    func done() {
        // Tell the current first responder (the current text input) to resign.
        UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
    }

    func cancel() {
        // Call "cancel" method on first object in the responder chain that implements it.
        UIApplication.shared.sendAction(#selector(cancel), to: nil, from: nil, for: nil)
    }
}

Then add the following to your applicationDidFinishLaunching to apply this to all your keyboards:

    let accessoryView = KeyboardAccessoryToolbar()
    UITextField.appearance().inputAccessoryView = accessoryView
    UITextView.appearance().inputAccessoryView = accessoryView

来源：https://stackoverflow.com/questions/30983516/add-uitoolbar-to-all-keyboards-swift