使用图像拾取器控制器的Swift圆形图像

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    
    let imagePicker = UIImagePickerController()
    let imageView = UIImageView()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置图像选择器的代理
        imagePicker.delegate = self
        
        // 设置图像视图的圆形样式
        imageView.layer.cornerRadius = imageView.frame.size.width / 2
        imageView.clipsToBounds = true
        
        // 添加图像视图到界面上
        self.view.addSubview(imageView)
        
        // 添加按钮用于触发图像选择
        let button = UIButton(frame: CGRect(x: 100, y: 100, width: 200, height: 50))
        button.setTitle("选择图像", for: .normal)
        button.backgroundColor = .blue
        button.addTarget(self, action: #selector(presentImagePicker), for: .touchUpInside)
        self.view.addSubview(button)
    }
    
    @objc func presentImagePicker() {
        // 设置图像选择器的来源为照片库
        imagePicker.sourceType = .photoLibrary
        
        // 允许编辑图像
        imagePicker.allowsEditing = true
        
        // 显示图像选择器
        present(imagePicker, animated: true, completion: nil)
    }
    
    // 处理图像选择完成后的回调方法
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        // 从info字典中获取编辑后的图像
        let editedImage = info[.editedImage] as? UIImage
        
        // 将图像显示在图像视图上
        imageView.image = editedImage
        
        // 关闭图像选择器
        picker.dismiss(animated: true, completion: nil)
    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        // 关闭图像选择器
        picker.dismiss(animated: true, completion: nil)
    }
}