ios - 如何快速在一个 View Controller 中将占位符设置为多个 TextView

Question

我有一个 View Controller ，其中包含两个 TextView (storyTitle 和 storyDe​​scription)。我在两个 TextView 中都添加了占位符，下面的代码将向您展示我是如何做到的:

// Setup the story title text field
func setupStoryTitleTextView() {

    storyTitle.textColor = .gray
    storyTitle.text = "Add story title"
    storyTitle.textContainerInset = UIEdgeInsets(top: 10, left: 20, bottom: 10, right: 20)
    self.storyTitle.delegate = self

    view.addSubview(storyTitle)

}
// Setup the storyDescription text view
func setupStoryDescriptionTextView() {

    storyDescription.text = "Description of the story"
    storyDescription.textColor = .gray
    storyDescription.textContainerInset = UIEdgeInsets(top: 10, left: 20, bottom: 300, right: 20)
    self.storyDescription.delegate = self

    view.addSubview(storyDescription)

}
// To remove placeholder text when the user starts typing
func textViewDidBeginEditing(_ textView: UITextView) {

    // Story title text view
    if storyTitle.textColor == .gray {
        storyTitle.text = nil
        storyTitle.textColor = .black
    }

    // Story description text view
    if storyDescription.textColor == .gray {
        storyDescription.text = nil
        storyDescription.textColor = .black
    }
}
// To bring the placeholder back when the text views don't contain any text
func textViewDidEndEditing(_ textView: UITextView) {

    // Story title text view
    if storyTitle.text.isEmpty {
        storyTitle.text = "Add story title"
        storyTitle.textColor = .gray
    }

    // Story description text view
    if storyDescription.text.isEmpty {
        storyDescription.text = "Description of the story"
        storyDescription.textColor = .gray
    }
}

这里发生的是，当我点击一个 TextView 时，两个 TextView 中的占位符都消失了，这是因为 textViewDidBeginEditing 下的两个 if 条件都被执行了。我怎样才能防止这种情况发生？感谢任何形式的帮助，谢谢 :)

Answer 1

您可以通过为 View 对象(您的 TextView )分配标签 轻松地做到这一点。使用 textview.tag = [some number] 分配一个标签，然后您还可以在您的条件中添加类似这样的内容:

storyDescription.tag = 1

func textViewDidBeginEditing(_ textView: UITextView) {
    if textView.tag == 1 && storyTitle.textColor == .gray {
        storyTitle.text = nil
        storyTitle.textColor = .black
    }
}

这类似于其他 TextView