底部锚点的 UITextView 问题 iOS

Question

我已经为一个聊天应用程序创建了一个输入容器。容器由一个组成：UIView，其中包含 UIImageView、UITextView 和 UIButton，所有这些都是以编程方式制作的。但我遇到的问题是我无法从底部移动 UITextView。它有点被键盘覆盖了。放置 bottomAnchor 不会移动 UITextView 但 topAnchor 可以正常工作。这是图片：

我尝试了很多方法，但我无法使它起作用。这是 UITextView 和 constraints 的代码：

lazy var inputTextField: UITextView = {
    let textField = UITextView()
    textField.text = "Enter message..."
    textField.translatesAutoresizingMaskIntoConstraints = false
    textField.font = UIFont(name: (textField.font?.fontName)!, size: 18)
    textField.layer.borderWidth = 1
    textField.layer.borderColor = UIColor.gray.cgColor
    textField.layer.cornerRadius = 25
    textField.textContainerInset = UIEdgeInsets(top: 15.0, left: 8.0, bottom: 0, right: 8.0)
    textField.delegate = self
    return textField
}()

和约束条件：

        addSubview(self.inputTextField)
    //x,y,w,h
    self.inputTextField.leftAnchor.constraint(equalTo: uploadImageView.rightAnchor, constant: 8).isActive = true
    self.inputTextField.rightAnchor.constraint(equalTo: sendButton.leftAnchor).isActive = true
    self.inputTextField.heightAnchor.constraint(equalTo: heightAnchor).isActive = true
    self.inputTextField.topAnchor.constraint(equalTo: separatorLineView.topAnchor, constant: 5.0).isActive = true

//bottom anchor doesn't work
    self.inputTextField.bottomAnchor.constraint(equalTo: self.bottomAnchor, constant: 5.0)
        .isActive = true

不确定我做错了什么。任何帮助将不胜感激。谢谢

Answer 1

试试这个方法

let topConstraint = NSLayoutConstraint(item: inputTextField, attribute: NSLayoutAttribute.left, relatedBy: NSLayoutRelation.equal, toItem: separatorLineView, attribute: NSLayoutAttribute.bottom, multiplier: 1, constant: 0)

NSLayoutConstraint.activate([topConstraint])

Answer 2

试试这个！

self.inputTextField.leftAnchor.constraint(equalTo: uploadImageView.rightAnchor, constant: 8).isActive = true
self.inputTextField.rightAnchor.constraint(equalTo: sendButton.leftAnchor).isActive = true
self.inputTextField.topAnchor.constraint(equalTo: separatorLineView.topAnchor, constant: 5.0).isActive = true
self.inputTextField.bottomAnchor.constraint(equalTo: self.bottomAnchor, constant: 5.0).isActive = true

问题是你已经给定了高度所以底部锚点没用了！希望对您有所帮助！

Answer 3

从下面的代码来看，它不会工作，因为已经给出了高度限制，因此顶部和高度将起作用，或者底部和高度将起作用。

    addSubview(self.inputTextField)
//x,y,w,h
self.inputTextField.leftAnchor.constraint(equalTo: uploadImageView.rightAnchor, constant: 8).isActive = true
self.inputTextField.rightAnchor.constraint(equalTo: sendButton.leftAnchor).isActive = true
self.inputTextField.heightAnchor.constraint(equalTo: heightAnchor).isActive = true
self.inputTextField.topAnchor.constraint(equalTo: separatorLineView.topAnchor, constant: 5.0).isActive = true

//bottom anchor doesn't work
    self.inputTextField.bottomAnchor.constraint(equalTo: self.bottomAnchor, constant: 5.0)
        .isActive = true

在您的方案中，您应该更改 separatorLineView 约束。（即）隐藏 separatorLineView bottomConstraints，只需将 separatorLineView 移动到顶部，这将自动将您的文本字段移动到所需位置。

希望对您有所帮助！

底部锚点的 UITextView 问题 iOS

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