如何以编程方式在 UIView 内部创建一个以编程方式添加的 UITextView？

Question

I am trying to make a text acceptor view like Instagram and Snapchat.

I am trying to add a UITextview (programatically) inside a UIView thats also added programatically. Below is the code I am trying to use to add the UITextView, but it is not working when added with UIView code. Please help. What I am trying to achieve is: import UIKit

    class TextViewViewController: UIViewController {
        
        override func viewDidLoad() {
            super.viewDidLoad()
            
            let View1: UIView = {
                let viewView = UIView()
                viewView.translatesAutoresizingMaskIntoConstraints = false
                viewView.contentMode = .scaleAspectFit
                viewView.backgroundColor = .red
                viewView.clipsToBounds = true
                return viewView
            }()
    
            self.view.addSubview(View1)
    
            View1.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: 0).isActive = true
            View1.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0).isActive = true
            View1.topAnchor.constraint(equalTo: view.topAnchor, constant: 250).isActive = true
            View1.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -250).isActive = true
            
            let textView = UITextView(frame: CGRect(x: 20.0, y: 90.0, width: 250.0, height: 100.0))
            textView.contentInsetAdjustmentBehavior = .automatic
             
             textView.center = self.view.center
             textView.textAlignment = NSTextAlignment.justified
             textView.backgroundColor = UIColor.lightGray
             
             // Use RGB colour
             textView.backgroundColor = UIColor(red: 39/255, green: 53/255, blue: 182/255, alpha: 1)
             
             // Update UITextView font size and colour
             textView.font = UIFont.systemFont(ofSize: 20)
             textView.textColor = UIColor.white
             textView.font = UIFont(name: "Verdana", size: 17)
  
             // Make UITextView web links clickable
             textView.isSelectable = true
             textView.isEditable = false
             textView.dataDetectorTypes = UIDataDetectorTypes.link
             
             // Make UITextView corners rounded
             textView.layer.cornerRadius = 10

             // Make UITextView Editable
             textView.isEditable = true
            View1.addSubview(textView)
//
//        let textView: UITextView = {
//            let tv = UITextView(frame: CGRect(x: 20.0, y: 90.0, width: 100.0, height: 50.0))
//            tv.contentInsetAdjustmentBehavior = .automatic
//            tv.center = self.view.center
//            tv.textAlignment = NSTextAlignment.justified
//            tv.textColor = UIColor.blue
//            tv.backgroundColor = UIColor.lightGray
//            return tv
//        }()
//
//        View1.addSubview(textView)
        
//        textView.topAnchor.constraint(equalTo: View1.topAnchor, constant: 20).isActive = true
//        textView.bottomAnchor.constraint(equalTo: View1.bottomAnchor, constant: 20).isActive = true
//        textView.leadingAnchor.constraint(equalTo: View1.leadingAnchor, constant: 0).isActive = true
//        textView.trailingAnchor.constraint(equalTo: View1.trailingAnchor, constant: 0).isActive = true
    }
}

Answer 1

The issue is in the next line of code

textView.center = self.view.center

Get rid of it and you will see the textView in the view hierarchy