Created
July 21, 2020 23:27
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A drop down textfield with RxSwift
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import UIKit | |
import RxSwift | |
import RxCocoa | |
final class DropdownTextField: CustomTextField, UIPickerViewDataSource, UIPickerViewDelegate { | |
var onDoneClicked: BehaviorRelay<Void?> = BehaviorRelay(value: nil) | |
var source: [String] = [] | |
let selectedValue: BehaviorRelay<String?> = BehaviorRelay(value: nil) | |
let hasValidData = BehaviorRelay(value: false) | |
let hasValueSelected = BehaviorRelay(value: false) | |
private let picker = UIPickerView() | |
private let disposeBag = DisposeBag() | |
override func setup() { | |
super.setup() | |
setupViewHierarchy() | |
setupBehavior() | |
} | |
private let iconImageView: UIImageView = { | |
let imageView = UIImageView() | |
imageView.image = Asset.Common.chevronDown.image | |
imageView.contentMode = .scaleAspectFit | |
return imageView.layoutable() | |
}() | |
private let activityIndicator = UIActivityIndicatorView(style: .gray).layoutable() | |
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { | |
if !source.isEmpty { | |
text = source[row] | |
hasValueSelected.accept(true) | |
selectedValue.accept(text) | |
} | |
} | |
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? { | |
return source[row] | |
} | |
func numberOfComponents(in pickerView: UIPickerView) -> Int { | |
return 1 | |
} | |
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { | |
return source.count | |
} | |
private func setupViewHierarchy() { | |
addSubviews([iconImageView, activityIndicator]) | |
iconImageView.constraintCenterToSuperview(axis: [.vertical], withConstant: .zero) | |
iconImageView.constraintToConstant(CGSize(width: 13, height: 13)) | |
iconImageView.rightAnchor.constraint(equalTo: rightAnchor, constant: -18).isActive = true | |
activityIndicator.constraintCenter(to: iconImageView) | |
} | |
private func setupBehavior() { | |
picker.delegate = self | |
inputView = picker | |
let flexBarButton = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil) | |
let doneBarButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(dismissInputView)) | |
keyboardToolbar.items = [doneBarButton, flexBarButton] | |
self.inputAccessoryView = keyboardToolbar | |
hasValidData | |
.observeOn(MainScheduler.instance) | |
.subscribe(onNext: { [weak self] hasData in | |
self?.iconImageView.isHidden = !hasData | |
self?.activityIndicator.isHidden = hasData | |
hasData ? self?.activityIndicator.stopAnimating() : self?.activityIndicator.startAnimating() | |
}) | |
.disposed(by: disposeBag) | |
} | |
@objc private func dismissInputView() { | |
self.onDoneClicked.accept(()) | |
self.endEditing(true) | |
} | |
} |
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Appreciated once again!