如何在以编程方式添加的 UIView 内部以编程方式创建 UITextView？

Question

我正在尝试制作像 Instagram 和 Snapchat 这样的文本接受器视图。

我正在尝试在 UIView 中添加一个 UITextview（以编程方式），这也是以编程方式添加的。下面是我试图用来添加 UITextView 的代码，但在添加 UIView 代码时它不起作用。请帮忙。我想要实现的是：导入 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

问题出在下一行代码

textView.center = self.view.center

去掉它，你会在视图层级中看到textView

如何在以编程方式添加的 UIView 内部以编程方式创建 UITextView？

How to create a UITextView programatically, inside UIView that is added programatically too?

ios

swift

uiview

uitextview

programmatically