如何从主类访问自定义集合视图单元格类中的文本视图 [英] How to access text views in custom collection view cell class from the main class

问题描述

我的每个集合视图单元格中有两个文本视图，我为这些单元格创建了一个自定义类.这是代码:

I've got two text views in each of my collection view cells, I've made a custom class for the cells. here is the code:

class CustomWriterPageCell: UICollectionViewCell {

    fileprivate let textViewOne: UITextView = {

        let tv = UITextView()
        tv.backgroundColor = .cyan
        tv.text = "Chapter Title"
        tv.font = UIFont(name: "Avenir-Roman", size: 27)
        tv.textColor = .gray
        return tv

    }()

    fileprivate let textViewTwo: UITextView = {

        let tv = UITextView()
        tv.textColor = .gray
        tv.text = "Start your story..."
        tv.textContainerInset = UIEdgeInsets(top: 20, left: 15, bottom: 20, right: 15)
        tv.font = UIFont(name: "Avenir-Book", size: 23)
        tv.backgroundColor = .black
        return tv

    }()
}

我想为这两个文本视图添加占位符，但问题是由于它们在自定义类中，我知道无法找出正在编辑的文本视图，因此我无法在 textViewDidEndEditing 发生时添加相应的占位符，有没有办法找出正在编辑哪个文本视图?有没有办法从主类访问文本视图?

I would like to add placeholders to both these text views but the problem is that since they are in a custom class there is no way, that I know of, to find out which text view is being edited so I can't add the respective placeholders back when textViewDidEndEditing takes place, is there a way to find out which text view is being edited? Is there a way to access the text views from the main class?

推荐答案

在您的 CustomWriterPageCell 类中:

fileprivate let textViewOne: UITextView = {

    let tv = UITextView()
    tv.backgroundColor = .cyan
    tv.text = "Chapter Title"
    tv.font = UIFont(name: "Avenir-Roman", size: 27)
    tv.textColor = .gray
    return tv

}()

fileprivate let textViewTwo: UITextView = {

    let tv = UITextView()
    tv.textColor = .gray
    tv.text = "Start your story..."
    tv.textContainerInset = UIEdgeInsets(top: 20, left: 15, bottom: 20, right: 15)
    tv.font = UIFont(name: "Avenir-Book", size: 23)
    tv.backgroundColor = .black
    return tv

}()

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

    textViewOne.delegate = self
    textViewTwo.delegate = self

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

那么:

extension CustomWriterPageCell : UITextViewDelegate {
      func textViewDidEndEditing(_ textView: UITextView) {

              if textView == textViewOne {
                  textView.text = "..."
              }
              else if textView == textViewTwo {
                  textView.text = "..."
              }
      }
}

这样，您的视图控制器仍然不需要知道您的文本视图.

This way, your View Controller still does not need to know about your text views.

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