UITextField的带下划线的文本会导致整个文本字段带有下划线

问题描述

当您在UITextField的某些文本下划线然后单击它时，如果光标位于带下划线的文本的右侧或内部，则整个文本字段都会带有下划线。有办法避免这种情况吗？

override func viewDidLoad() {
    super.viewDidLoad()

    let textField1 = UITextField(frame: CGRect(x: 20,y: 100,width: 300,height: 40))
    textField1.borderStyle = UITextField.BorderStyle.roundedRect
    textField1.allowsEditingTextAttributes = true
    view.addSubview(textField1)

    let textField2 = UITextField(frame: CGRect(x: 20,y: 150,height: 40))
    textField2.borderStyle = UITextField.BorderStyle.roundedRect
    textField2.allowsEditingTextAttributes = true
    view.addSubview(textField2)
}

解决方法

这就是我的工作，结合了其他SO天才的解决方案。 请注意，视图控制器中的每个textView必须具有从0开始的唯一顺序标签。 如果有人有所改进，我将不胜感激。

var textViewPlaceholder1: UILabel!
var textViewPlaceholders = [UILabel]()
let kFontSize: CGFloat = 17.0
let kPlaceholderLeftInset: CGFloat = 8.0

override func viewDidLoad() {
    super.viewDidLoad()
    
    let textView1Frame = CGRect(x: 20.0,y: 100.0,width: 300.0,height: 34.0)
    let textView1 = makeTextView(withFrame: textView1Frame)
    textView1.tag = 0
    // For testing: textView1.attributedText = NSAttributedString(string: "One two three",attributes: [.foregroundColor : UIColor.systemRed,.font : UIFont.systemFont(ofSize: kFontSize)])
    view.addSubview(textView1)

    let textViewPlaceholder1Frame = CGRect(x: textView1Frame.origin.x + kPlaceholderLeftInset,y: textView1Frame.origin.y,width: textView1Frame.width,height: textView1Frame.height)
    textViewPlaceholder1 = UILabel(frame: textViewPlaceholder1Frame)
    textViewPlaceholder1.attributedText = NSAttributedString(string: "Text view 1...",attributes: [.foregroundColor : UIColor.systemGray3,.font : UIFont.systemFont(ofSize: kFontSize)])
    textViewPlaceholder1.isHidden = true
    textViewPlaceholders.append(textViewPlaceholder1)
    view.addSubview(textViewPlaceholder1)

    let textField2 = UITextField(frame: CGRect(x: 20.0,y: 150.0,height: 34.0))
    textField2.font = .systemFont(ofSize: kFontSize)
    textField2.borderStyle = UITextField.BorderStyle.roundedRect
    textField2.allowsEditingTextAttributes = true
    textField2.placeholder = "Text field 2..."
    view.addSubview(textField2)
}

func makeTextView(withFrame: CGRect) -> UITextView {
    let textView = UITextView(frame: withFrame)
    textView.delegate = self
    textView.layer.cornerRadius = 5.0
    textView.layer.borderWidth = 1.0
    textView.layer.borderColor = UIColor.systemGray4.cgColor
    textView.textContainerInset = UIEdgeInsets(top: 7.0,left: 2.0,bottom: 5.0,right: 5.0)
    textView.font = .systemFont(ofSize: kFontSize)
    textView.allowsEditingTextAttributes = true
    return textView
}

func textView(_ textView: UITextView,shouldChangeTextIn range: NSRange,replacementText text: String) -> Bool {
    guard text.rangeOfCharacter(from: CharacterSet.newlines) == nil else {
        // textView.resignFirstResponder() // uncomment this to close the keyboard when return key is pressed
        return false
    }
    if (range.location > 0 || text.count != 0) {
        textViewPlaceholders[textView.tag].isHidden = true
    } else {
        textViewPlaceholders[textView.tag].isHidden = false
    }
    return true
}