UITextView问题与底部锚iOS

Question

我为一个聊天应用程序创建了一个输入容器。容器由以下一种容器制成：UIView，其中包含UIImageView，UITextView和UIButton，它们都是以编程方式创建的。但是我遇到的问题是我无法从底部移动UITextView。它有点被键盘遮盖了。放置bottomAnchor不会移动UITextView，但是topAnchor可以正常工作。这是图片：

我尝试了许多方法，但无法使其起作用。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：

        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

不确定我在做什么错。任何帮助将不胜感激。谢谢

Answer 1

尝试一下！

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

问题是您已经指定了高度，所以底部锚点无用！希望我能对您有所帮助！

Answer 2

在下面的代码中，它不起作用，因为已经给出了高度限制，因此top和Height都可以工作，或者bottom和Height都可以工作。

    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，只需移动separatorLineView顶部，这会自动移动您的文本字段到所需的位置。

希望这对您有帮助！

Answer 3

尝试这种方式

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

NSLayoutConstraint.activate([topConstraint])