为RxPickerViewAttributedStringAdapter添加Done按钮（RxSwift实现）

步骤1：创建带Done按钮的工具栏 #

在View代码中，构建一个包含Done按钮的UIToolbar，并将其设置为文本框的输入辅助视图：

// 初始化工具栏
let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 44))
toolbar.barStyle = .default

// 创建Done按钮和弹性占位项
let doneButton = UIBarButtonItem(title: "Done", style: .done, target: nil, action: nil)
let flexibleSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)

// 配置工具栏项目布局
toolbar.items = [flexibleSpace, doneButton]

// 绑定到文本框的输入辅助视图
self.genderField?.inputAccessoryView = toolbar

步骤2：用RxSwift处理Done按钮点击 #

通过RxSwift订阅Done按钮的点击事件，触发键盘收起（同时隐藏PickerView）：

doneButton.rx.tap
    .subscribe(onNext: { [weak self] in
        self?.genderField?.resignFirstResponder()
    })
    .disposed(by: bag)

步骤3：同步PickerView选择到ViewModel（可选但推荐） #

确保PickerView的选中项能同步到ViewModel的gender属性，添加绑定逻辑：

if let genderSource = castedViewModel.genderSource {
    castedViewModel
        .gender
        .bind(to: genderPicker.rx.items(adapter: genderSource))
        .disposed(by: bag)
    
    // 订阅PickerView选择事件，更新ViewModel
    genderPicker.rx.itemSelected
        .subscribe(onNext: { [weak self] row, component in
            guard let self = self, let selectedOption = self.castedViewModel.genderDetail.value[row] else { return }
            self.castedViewModel.gender.accept(selectedOption)
        })
        .disposed(by: bag)
}

self.genderField?.inputView = genderPicker

完整整合后的View代码 #

// 配置PickerView与ViewModel的绑定
if let genderSource = castedViewModel.genderSource {
    castedViewModel
        .gender
        .bind(to: genderPicker.rx.items(adapter: genderSource))
        .disposed(by: bag)
    
    // 同步选择项到ViewModel
    genderPicker.rx.itemSelected
        .subscribe(onNext: { [weak self] row, component in
            guard let self = self, let selectedOption = self.castedViewModel.genderDetail.value[row] else { return }
            self.castedViewModel.gender.accept(selectedOption)
        })
        .disposed(by: bag)
}

// 创建带Done按钮的工具栏
let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 44))
toolbar.barStyle = .default

let doneButton = UIBarButtonItem(title: "Done", style: .done, target: nil, action: nil)
let flexibleSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)

toolbar.items = [flexibleSpace, doneButton]
self.genderField?.inputAccessoryView = toolbar

// RxSwift处理Done按钮点击
doneButton.rx.tap
    .subscribe(onNext: { [weak self] in
        self?.genderField?.resignFirstResponder()
    })
    .disposed(by: bag)

// 设置PickerView为文本框的输入视图
self.genderField?.inputView = genderPicker

内容的提问来源于stack exchange，提问作者yselimguner