ios - 将 inputView 背景颜色从模糊灰色更改为其他任何颜色

Question

我正在尝试将 inputView 背景颜色从默认的灰色更改为其他颜色，但我没有看到任何解决方案。

我有 UIPickerView，它会在用户触摸 textField 时打开，它像键盘一样位于底部，如 inputView。我是这样实现的:myTextField.inputView = myPickerView。

因为我在 inputView 中使用它，我想我实际上必须更改它的背景颜色，但不知道如何更改。

看起来像这样:

现在我想改变它的背景颜色。

我已经试过了:

1. myPickerView.setValue(0.8, forKey: "alpha")
2. myPckerView.backgroundColor = UIColor.blue
3. self.inputView.backgroundColor = UIColor.blue
4. 以及来自 SO 的几乎所有解决方案

这是输出(上面有一些令人讨厌的模糊层):

我是否必须为此创建某种自定义键盘，或者是否有解决方法，或者 Apple 再次告诉您您可以做什么，什么不能像机器人一样？

Answer 1

好的 - 因为您可以在“普通” View 中以您想要的方式获得 UIPickerView 外观，所以您可以创建一个“普通” View 以用作您的.inputView 然后将您的选择器 View 添加为 subview 。

这是一个简单的示例 - 只需在 IB 中添加一个 UITextField 并将其连接到 IBOutlet:

class MyViewController: UIViewController
{

    @IBOutlet weak var theTextField: UITextField!

    let cancelButton: UIButton = {
        let b = UIButton()
        b.setTitle("Cancel", for: .normal)
        b.translatesAutoresizingMaskIntoConstraints = false
        return b
    }()

    let doneButton: UIButton = {
        let b = UIButton()
        b.setTitle("Done", for: .normal)
        b.translatesAutoresizingMaskIntoConstraints = false
        return b
    }()

    let pvToolbar: UIView = {
        let v = UIView(frame: CGRect(x: 0, y: 0, width: 10, height: 40))
        v.translatesAutoresizingMaskIntoConstraints = false
        v.backgroundColor = .black
        return v
    }()

    let pvBackground: UIView = {
        let v = UIView(frame: CGRect(x: 0, y: 0, width: 10, height: 10))
        v.backgroundColor = .white
        v.translatesAutoresizingMaskIntoConstraints = false
        return v
    }()

    let pickerView: UIPickerView = {
        let p = UIPickerView(frame: CGRect(x: 0, y: 0, width: 10, height: 10))
        p.showsSelectionIndicator = true
        p.translatesAutoresizingMaskIntoConstraints = false
        return p
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        // add buttons to the inputAccessoryView "toolbar"
        pvToolbar.addSubview(cancelButton)
        pvToolbar.addSubview(doneButton)

        cancelButton.leftAnchor.constraint(equalTo: pvToolbar.leftAnchor, constant: 8.0).isActive = true
        cancelButton.topAnchor.constraint(equalTo: pvToolbar.topAnchor, constant: 6.0).isActive = true
        cancelButton.bottomAnchor.constraint(equalTo: pvToolbar.bottomAnchor, constant: -6.0).isActive = true

        doneButton.rightAnchor.constraint(equalTo: pvToolbar.rightAnchor, constant: -8.0).isActive = true
        doneButton.centerYAnchor.constraint(equalTo: cancelButton.centerYAnchor).isActive = true

        // add pickerView to our plain UIView that will become our inputView
        pvBackground.addSubview(pickerView)

        pickerView.topAnchor.constraint(equalTo: pvBackground.topAnchor).isActive = true
        pickerView.bottomAnchor.constraint(equalTo: pvBackground.bottomAnchor).isActive = true
        pickerView.centerXAnchor.constraint(equalTo: pvBackground.centerXAnchor).isActive = true
        pickerView.widthAnchor.constraint(equalTo: pvBackground.widthAnchor, multiplier: 1.0).isActive = true

        pickerView.delegate = self
        pickerView.dataSource = self

        // pvBackground "contains" the actual pickerView
        theTextField.inputView = pvBackground

        theTextField.inputAccessoryView = pvToolbar

    }

}

extension AnimConstraintsViewController:  UIPickerViewDelegate, UIPickerViewDataSource {

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return "Row: \(row)"
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return 30
    }

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
        // simple label with centered text as our viewForRow
        let label = UILabel()
        label.backgroundColor = .white
        label.textColor = .black
        label.textAlignment = .center
        label.font = UIFont.systemFont(ofSize: 17.0, weight: UIFontWeightRegular)
        label.text = "Row: \(row)"
        return label
    }
}

结果: