Created
June 21, 2020 12:59
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A SwiftUI field with a UIPickerView as a keyboard
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import SwiftUI | |
struct ContentView: View { | |
@State var selectedIndex: Int? = nil | |
let options: [String] = ["Option1", "Option2"] | |
var body: some View { | |
PickerField("Select an option", data: self.options, selectionIndex: self.$selectedIndex) | |
} | |
} |
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import SwiftUI | |
struct PickerField: UIViewRepresentable { | |
// MARK: - Public properties | |
@Binding var selectionIndex: Int? | |
// MARK: - Initializers | |
init<S>(_ title: S, data: [String], selectionIndex: Binding<Int?>) where S: StringProtocol { | |
self.placeholder = String(title) | |
self.data = data | |
self._selectionIndex = selectionIndex | |
textField = PickerTextField(data: data, selectionIndex: selectionIndex) | |
} | |
// MARK: - Public methods | |
func makeUIView(context: UIViewRepresentableContext<PickerField>) -> UITextField { | |
textField.placeholder = placeholder | |
return textField | |
} | |
func updateUIView(_ uiView: UITextField, context: UIViewRepresentableContext<PickerField>) { | |
if let index = selectionIndex { | |
uiView.text = data[index] | |
} else { | |
uiView.text = "" | |
} | |
} | |
// MARK: - Private properties | |
private var placeholder: String | |
private var data: [String] | |
private let textField: PickerTextField | |
} |
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import SwiftUI | |
class PickerTextField: UITextField { | |
// MARK: - Public properties | |
var data: [String] | |
@Binding var selectionIndex: Int? | |
// MARK: - Initializers | |
init(data: [String], selectionIndex: Binding<Int?>) { | |
self.data = data | |
self._selectionIndex = selectionIndex | |
super.init(frame: .zero) | |
self.inputView = pickerView | |
self.tintColor = .clear | |
} | |
@available(*, unavailable) | |
required init?(coder: NSCoder) { | |
fatalError("init(coder:) has not been implemented") | |
} | |
// MARK: - Private properties | |
private lazy var pickerView: UIPickerView = { | |
let pickerView = UIPickerView() | |
pickerView.delegate = self | |
pickerView.dataSource = self | |
return pickerView | |
}() | |
// MARK: - Private methods | |
@objc | |
private func donePressed() { | |
self.selectionIndex = self.pickerView.selectedRow(inComponent: 0) | |
self.endEditing(true) | |
} | |
} | |
// MARK: - UIPickerViewDataSource & UIPickerViewDelegate extension | |
extension PickerTextField: UIPickerViewDataSource, UIPickerViewDelegate { | |
func numberOfComponents(in pickerView: UIPickerView) -> Int { | |
return 1 | |
} | |
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { | |
return self.data.count | |
} | |
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? { | |
return self.data[row] | |
} | |
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { | |
self.selectionIndex = row | |
} | |
} |
Hi guys, here's some thips.
You can add a done button with a tool bar
using the code below in PickerTextField
Class
init(data: [String], selectionIndex: Binding<Int?>) {
let toolBar = UIToolbar()
toolBar.barStyle = UIBarStyle.default
toolBar.isTranslucent = true
toolBar.sizeToFit()
let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItem.Style.done, target: self, action: #selector(self.donePressed))
let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.flexibleSpace, target: nil, action: nil)
toolBar.setItems([spaceButton, doneButton], animated: false)
toolBar.isUserInteractionEnabled = true
self.inputAccessoryView = toolBar
}
@objc private func donePressed() {
self.resignFirstResponder()
}
Also, you can make users can't copy and paste
or drag
the content inside of the text field with the code below
Just copy and paste inside of PickerTextField
class.
override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
false
}
override func selectionRects(for range: UITextRange) -> [UITextSelectionRect] {
[]
}
override func caretRect(for position: UITextPosition) -> CGRect {
.zero
}
Good luck!
Thanks for your tips, @diamantidis
override func caretRect(for position: UITextPosition) -> CGRect {
.null
}
This will truly make it unselectable! Relevant StackOverflow post: https://stackoverflow.com/questions/32846678/how-to-disable-the-selection-of-a-uitextfield/62754240#62754240
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@diamantidis Thanks for this great example! Have you been able to get the picker to be the same height as the keyboard? If you open the picker, then a textfield, then the picker I see a black gap above the picker