Swift 3:UITextView-动态高度-以编程方式 [英] Swift 3: UITextView - Dynanmic height - Programmatically

问题描述

我有一个keyboardContainer类(UIView的子类/通过编程方式创建，因此没有故事板)，包括一个UITextView供用户键入消息.在Chat日志类中使用它并将其设置为inputAccessoryView.我想在用户键入时动态更改其高度.

I have a keyboardContainer class (Subclass of UIView / created programmatically so no storyboard) including a UITextView for the user to type messages in. It is used within a Chat log class and set as the inputAccessoryView. I want to dynamically change the height of it when the user is typing.

我搜索了答案并找到了一些答案.但是，由于他们对我不起作用，我没有得到他们中的大多数.

I searched for answers and found some. However, I didn't get most of them as they didn't work for me.

要获得想要的效果，我必须实现什么?

What do I have to implement to get the effect I want to have?

感谢您的帮助！

首先感谢您的帮助！

但是，我是编码的新手，所以我无法解决问题.我想这与我创建keyboardContainer类的方式及其约束有关……

However, I´m pretty new to coding so I could not solve the issue. I guess it has something to do with the way I created my keyboardContainer class and its constraints...

这是我的键盘容器类中的相关代码:

Here is the relevant code from within my keyboard container class:

 let textField:UITextView = {
    let view = UITextView()
    view.translatesAutoresizingMaskIntoConstraints = false
    view.layer.cornerRadius = 15
    view.layer.masksToBounds = true
    view.font = UIFont.systemFont(ofSize: 15)
    view.backgroundColor = .white
    return view
}()

overried init(frame: CGRect){
super.init(frame: frame)

addSubview(textField)
    textField.leftAnchor.constraint(equalTo: leftButton, constant: 5).isActive = true
    textField.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true

    textFieldHeightAnchor = textField.heightAnchor.constraint(equalTo: heightAnchor, constant: -10)
    textFieldHeightAnchor.isActive = true

    textFieldRightAnchor = textField.rightAnchor.constraint(equalTo: rightAnchor, constant: -85)
    textFieldRightAnchor.isActive = true
}

在我的ChatLog中，我正在使用此

Inside my ChatLog I´m using this:

 lazy var keyboard: KeyboardContainer = {
    let key = KeyboardContainer()
    key.frame = CGRect(x: 0, y: 0, width: self.view.frame.width, height: 45)
    key.sendButton.addTarget(self, action: #selector(handleSend), for: .touchUpInside)
    return key
}()

override var inputAccessoryView: UIView?{
    get{
        return keyboard
    }
}

我需要更改什么?我猜有限制吗?

What do I need to change ? I guess the constraints?

推荐答案

您可以使textView符合UITextViewDelegate，然后将其调整为contentSize.

You can make your textView conform to the UITextViewDelegate and then resize it to it's contentSize.

让您的视图控制器符合委托

Make your view controller conform to the delegate

class ViewController: UIViewController, **UITextViewDelegate** { ... 

之后

yourTextView.delegate = self // put that in viewDidLoad()

然后，您可以实现textViewDidChange方法.这意味着，每次您在键盘上输入内容时，都会调用此功能.

Then you can implement the textViewDidChange method. That means, every time you enter something into the keyboard, this function is called.

func textViewDidChange(_ textView: UITextView) {


if textView == youTextView {

    let currentHeight = textView.frame.size.height

    textView.frame.size.height = 0 // you have to do that because if not it's not working with the proper content size

    textView.frame.size = textView.contentSize // here you detext your textView's content size and make it resize.

    let newHeight = textView.frame.size.height

    let heightDifference = newHeight - currentHeight // get the height difference from before and after editing

    yourContainerView.frame.size.height += heightDifference

}

}

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