ios - 我如何以编程方式创建动态文本字段

Question

我想在用户单击 View 上的某处时添加一个动态文本字段。文本字段应随着用户键入而增加大小。目前我正在使用下面的代码

textfield = UITextField(frame: rect)
            textfield.backgroundColor = UIColor.clear
            textfield.layer.borderColor = UIColor.clear.cgColor
            textfield.autocorrectionType = UITextAutocorrectionType.no
            textfield.textColor = UIColor.blue
            textfield.textAlignment = .right
            textfield.layer.borderWidth = 1.0
            textfield.delegate = self
            textfield.becomeFirstResponder()

但是这个文本框不会自动增加高度和宽度。

Answer 1

你可以试试

class ViewController: UIViewController , UITextViewDelegate {

    @IBOutlet weak var textView: UITextView!

    override func viewDidLoad() {
        super.viewDidLoad()

        textView.delegate = self 
    }

   func textViewDidChange(_ textView: UITextView) {

       let ff = textView.text! as NSString

       let rr = ff.size(withAttributes: [NSAttributedStringKey.font:UIFont(name: "Helvetica", size: 17)])

       textView.frame = CGRect(origin: textView.frame.origin, size: rr)
   }

}

//

阿拉伯语

func textViewDidChange(_ textView: UITextView) {

    let ff = textView.text! as NSString

   let rr = ff.size(withAttributes: [NSAttributedStringKey.font:UIFont(name: "Helvetica", size: 17)!])

    textView.frame = CGRect(origin:CGPoint(x: self.view.frame.width - rr.width, y: textView.frame.origin.y), size: rr)

 }