在 Swift 的文本输入中输入每个字符时键盘关闭

Question

我有一个 textField。

private var verseTitle: UITextField = {
    let tf = UITextField()
    tf.placeholder = "TITLE"
    tf.font = UIFont(suite16: .tBlackItalic, size: 18)
    tf.textColor = .black.withAlphaComponent(0.5)
    tf.returnKeyType = .done
    tf.translatesAutoresizingMaskIntoConstraints = false
    return tf
}()

在 viewDidLoad 方法中，我已将自己指定为委托。

override func viewDidLoad() {
    super.viewDidLoad()

    self.view.backgroundColor = .white
    verseTitle.delegate = self
}

在 viewDidLayout 方法中，我使用堆栈视图将 textField 添加到视图。

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    
    //Title
    let titleStack = UIStackView()
    titleStack.axis = .horizontal
    titleStack.alignment = .center
    titleStack.distribution = .equalSpacing
    titleStack.spacing = 8
    
    titleStack.addArrangedSubview(verseTitle)
    titleStack.addArrangedSubview(floorView)
    titleStack.translatesAutoresizingMaskIntoConstraints = false

    view.addSubview(titleStack)

    NSLayoutConstraint.activate([
        
        floorView.heightAnchor.constraint(equalToConstant: 13),
        floorView.widthAnchor.constraint(equalToConstant: 13),
        
        
        titleStack.centerXAnchor.constraint(equalTo: view.centerXAnchor),
        titleStack.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 20),
])
}

现在，我面临的问题是，当我开始在 textField 中键入内容时，只有在我键入一个字母后键盘才会消失。我不确定为什么会这样。输入每个字母后，我必须点击该字段。出于某种原因，输入每个字母后焦点会从字段中移开（除非我点击建议的自动更正 - 整个字符串会立即正确添加到字符串中）

Answer 1

这是您的视图，包括 UITextField 在每次击键后得到 re-created，因为您的视图构造位于：

viewDidLayoutSubviews(), When the bounds change for a view controller's view, the view adjusts the positions of its subviews and then the system calls this method.

要修复它，将代码移动到 ViewDidLoad，这样视图只创建一次：

override func viewDidLoad() {
    super.viewDidLoad()
    
    self.view.backgroundColor = .white
    verseTitle.delegate = self
    
    let titleStack = UIStackView()
    titleStack.axis = .horizontal
    titleStack.alignment = .center
    titleStack.distribution = .equalSpacing
    titleStack.spacing = 8
    
    titleStack.addArrangedSubview(verseTitle)
    titleStack.translatesAutoresizingMaskIntoConstraints = false
    
    view.addSubview(titleStack)
    
    NSLayoutConstraint.activate([
        titleStack.centerXAnchor.constraint(equalTo: view.centerXAnchor),
        titleStack.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 20),
    ])
}

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