如果uitextfield是一个子视图

Question

我对uitextfield有一个奇怪的问题：

class AnnotateTextField: UIView {

    // MARK: - Views

    let textField = UITextField()

    // MARK: - Initializers

    init() {
        super.init(frame: .zero)

        setupViews()
    }

    @available(*, unavailable)
    private override init(frame: CGRect) {
        fatalError("init(frame:) has not been implemented")
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    // MARK: - Setup

    private func setupViews() {
        let textField = UITextField()
        textField.font = UIFont.systemFont(ofSize: 100.0)
        textField.textColor = .white

        backgroundColor = .black.withAlphaComponent(0.7)
        clipsToBounds = true
        layer.cornerRadius = 16.0
        // Paint stays behind it
        layer.zPosition = 1

        addSubview(textField)
        textField.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(16.0)
        }
    }

}

如果我将其添加到我的视图中，并调用supsfirstresponder键盘不会显示：

private func addText() {
    let annotateTextField = AnnotateTextField()

    addSubview(annotateTextField)
    annotateTextField.snp.makeConstraints { make in
        make.center.equalToSuperview()
    }

    annotateTextField.textField.becomeFirstResponder()
}

但是对于常规uite> uitexfield 它可以正常工作：

private func addText() {
    let text = UITextField()
    addSubview(text)
    // This shows the keyboard
    text.becomeFirstResponder()
}

我在这里做错了什么？我尝试在annotateTextfield上设置用户交互设置，但没有区别。

Answer 1

我认为PREMLEM在setupViews函数中。您正在该功能中创建一个新的TextField对象，并在此TextField上进行更改，并将其添加到视图中。

解决此问题删除函数内部函数中的新的Texfield对象，

 private func setupViews() {

    textField.font = UIFont.systemFont(ofSize: 100.0)
    textField.textColor = .white

    backgroundColor = .black.withAlphaComponent(0.7)
    clipsToBounds = true
    layer.cornerRadius = 16.0
    // Paint stays behind it
    layer.zPosition = 1

    addSubview(textField)
    textField.snp.makeConstraints { make in
        make.edges.equalToSuperview().inset(16.0)
    }
}

或将类中的Textfield对象平衡到您在此函数中创建的对象如

 private func setupViews() {
    let textField = UITextField()

    textField.font = UIFont.systemFont(ofSize: 100.0)
    textField.textColor = .white

    backgroundColor = .black.withAlphaComponent(0.7)
    clipsToBounds = true
    layer.cornerRadius = 16.0
    // Paint stays behind it
    layer.zPosition = 1
    self.textField = textField // add this
    addSubview(self.textField) // change this
    textField.snp.makeConstraints { make in
        make.edges.equalToSuperview().inset(16.0)
    }
}

annotateTextfield.textfield的框架为零，因为您正在创建一个新的TextField，并且您正在设置函数中的Textfield

中的textfield