ios - 输入长文本时，textview 会附加与输入成比例的空格

Question

the empty space on the end我正在获取我的 TextView 文本(我正在编写的 TextView )的大小，并将其设置为等于我正在显示它的 TextView 的大小。但是如果写更长的文本，当我发布它时，它会在我的 TextView 中显示更长的空白空间。我通过测量我正在写的 textV 的 content.height 为我的 TextView 的大小编写了代码。

} else if identifier == "save" {
        print("Save button tapped")

        if textViewWrite.text == "" {
            print("text empty")
        }
        else{

            print("\(textViewWrite.contentSize.height)")



            let size: CGSize = textViewWrite.sizeThatFits(CGSize.init(width: textViewWrite.frame.size.width, height: CGFloat.greatestFiniteMagnitude))
            let insets: UIEdgeInsets = textViewWrite.textContainerInset;
            let relevantHeight = size.height - insets.top - insets.bottom;

            let text = Post(texts: "String", textHeight: relevantHeight, textWidth: textViewWrite.contentSize.width)
            PostService.create(text: self.textViewWrite.text!, height: Int(textViewWrite.contentSize.height), width: Int(view.frame.width) )
            print("\(textViewWrite.contentSize.height)")

            // 1
            let HomeViewController = segue.destination as! HomeViewController
            // 2
            HomeViewController.posts.append(text)

        }
        textViewWrite.text = ""
    }
}

Answer 1

我以前看过您使用的方法，但是出于您的目的，我认为最好使用 layout constraints .在我看来，这要容易得多。

你想要做的是使用布局约束来约束接收 TextView 的高度属性。

在您的接收 TextView 中尝试像这样设置布局约束...

let captionContainer: UIView = {
    let c = UIView()
    c.translatesAutoresizingMaskIntoConstraints = false
    c.backgroundColor = UIColor.lightGray
    c.layer.cornerRadius = 6
    return c
}()

let caption: UITextView = {
    let c = UITextView()
    c.textAlignment = .left
    c.font = .systemFont(ofSize: 14)
    c.isScrollEnabled = false
    c.translatesAutoresizingMaskIntoConstraints = false
    return c
}()

func setupCaption() {

    view.addSubview(captionContainer)
    view.addSubview(caption)

    //Container Constratins
    captionContainer.widthAnchor.constraint(equalToConstant: 250).isActive = true
    captionContainer.heightAnchor.constraint(equalTo: caption.heightAnchor, multiplier: 1).isActive = true
    captionContainer.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    captionContainer.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true

    //Caption Constraints
    caption.widthAnchor.constraint(equalToConstant: 250).isActive = true
    caption.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    caption.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true

    // This constraint controls the maximum height the caption can have.
    NSLayoutConstraint(item: caption, attribute: .height, relatedBy: .lessThanOrEqual, toItem: view, attribute: .height, multiplier: 0.25, constant: 0).isActive = true
}

然后将标题文本设置为您用于用户输入的任何文本字段或 TextView 。

祝你好运。