ios - 如何从主类访问自定义 Collection View 单元格类中的 TextView

Question

我的每个 Collection View 单元格中都有两个 TextView ，我为这些单元格创建了一个自定义类。这是代码:

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 TextView 添加占位符，但问题是，由于它们在自定义类中，据我所知，无法找出正在编辑的 TextView ，所以我不能在 textViewDidEndEditing 发生时添加相应的占位符，有没有办法找出正在编辑的 TextView ？有没有办法从主类访问 TextView ？

Answer 1

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")
    }
}

然后:

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

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

这样，您的 View Controller 仍然不需要知道您的 TextView 。