多个 UITextView 占位符

Question

我正在尝试将占位符放入我的 UITextViews 中，并在此处使用这段代码找到了解决方案：

func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {

    let currentText:NSString = storyView.text 
    let updatedText = currentText.stringByReplacingCharactersInRange(range, withString:text)

    if updatedText.isEmpty {
        storyView.text = "Write out your story here!"
        storyView.textColor = UIColor.lightGrayColor()
        storyView.selectedTextRange = storyView.textRangeFromPosition(storyView.beginningOfDocument, toPosition: storyView.beginningOfDocument)
        return false

    }else if storyView.textColor == UIColor.lightGrayColor() && !text.isEmpty {
        storyView.text = nil
        storyView.textColor = UIColor.blackColor()
    }

    return true
}

func textViewDidChangeSelection(storyView: UITextView) {
    if self.view.window != nil {
        if storyView.textColor == UIColor.lightGrayColor() {
            storyView.selectedTextRange = storyView.textRangeFromPosition(storyView.beginningOfDocument, toPosition: storyView.beginningOfDocument)
        }
    }
}

它可以工作，我很满意，但我想将它应用到同一个 ViewController 中的其他 UITextView。如果不创建 textView 方法的重复实例，我该怎么做？

Answer 1

您可以在您的shouldChangeTextInRange 方法中使用textField.tag。

为您的textField 或相同的viewcontroller 提供标签。并将该标签用于shouldChangeTextInRange 方法。

func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {

    let currentText:NSString = storyView.text 
    let updatedText = currentText.stringByReplacingCharactersInRange(range, withString:text)

    if updatedText.isEmpty {


if (textField.tag==0)//
 {
   storyView.text = "Write out your story here!" // stuff
}
else if(textField.tag==1)//
 {
    storyView.text = "Example 2 "// stuff
}
   storyView.textColor = UIColor.lightGrayColor()
  storyView.selectedTextRange = storyView.textRangeFromPosition(storyView.beginningOfDocument, toPosition: storyView.beginningOfDocument)
        return false

    }else if storyView.textColor == UIColor.lightGrayColor() && !text.isEmpty {
        storyView.text = nil
        storyView.textColor = UIColor.blackColor()
    }

    return true
}

func textViewDidChangeSelection(storyView: UITextView) {
    if self.view.window != nil {
        if storyView.textColor == UIColor.lightGrayColor() {
            storyView.selectedTextRange = storyView.textRangeFromPosition(storyView.beginningOfDocument, toPosition: storyView.beginningOfDocument)
        }
    }

}

也许对你有帮助。