显示UIImagePickerController时检测到泄漏

func showImagePicker() {
    let imagePicker = UIImagePickerController()
    // 配置UIImagePickerController的相关属性
    // ...
    present(imagePicker, animated: true, completion: nil)
}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    picker.dismiss(animated: true, completion: nil)
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    // 处理选中的图片或视频
    // ...
    picker.dismiss(animated: true, completion: nil)
}

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    var imagePicker: UIImagePickerController?
    
    func showImagePicker() {
        imagePicker = UIImagePickerController()
        imagePicker?.delegate = self
        // 配置UIImagePickerController的相关属性
        // ...
        present(imagePicker!, animated: true, completion: nil)
    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        picker.dismiss(animated: true, completion: nil)
        imagePicker?.delegate = nil
        imagePicker = nil
    }
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        // 处理选中的图片或视频
        // ...
        picker.dismiss(animated: true, completion: nil)
        imagePicker?.delegate = nil
        imagePicker = nil
    }
}