通过拖动角调整文本视图的大小(Swift)

import UIKit

class ResizableTextView: UIView {
    
    private var resizingCorner: UIView!
    private var initialTouchPoint: CGPoint!
    private var initialFrame: CGRect!
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupResizingCorner()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setupResizingCorner()
    }
    
    private func setupResizingCorner() {
        resizingCorner = UIView(frame: CGRect(x: frame.width - 10, y: frame.height - 10, width: 20, height: 20))
        resizingCorner.backgroundColor = .red
        resizingCorner.isUserInteractionEnabled = true
        let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture(_:)))
        resizingCorner.addGestureRecognizer(panGesture)
        addSubview(resizingCorner)
    }
    
    @objc private func handlePanGesture(_ gestureRecognizer: UIPanGestureRecognizer) {
        let touchPoint = gestureRecognizer.location(in: superview)
        
        switch gestureRecognizer.state {
        case .began:
            initialTouchPoint = touchPoint
            initialFrame = frame
        case .changed:
            let deltaX = touchPoint.x - initialTouchPoint.x
            let deltaY = touchPoint.y - initialTouchPoint.y
            var newWidth = initialFrame.width + deltaX
            var newHeight = initialFrame.height + deltaY
            
            // Ensure the view does not become too small or too large
            newWidth = max(newWidth, 50)
            newHeight = max(newHeight, 50)
            
            frame = CGRect(x: initialFrame.origin.x, y: initialFrame.origin.y, width: newWidth, height: newHeight)
        default:
            break
        }
    }
}