如何在自定义CNContactViewController中异步更新图像

import ContactsUI

class MyContactViewController: CNContactViewController, CNContactViewControllerDelegate {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.delegate = self
        
        // 获取联系人标识符
        let contactIdentifier = "your_contact_identifier"
        
        // 使用标识符获取联系人对象
        let store = CNContactStore()
        let keysToFetch = [CNContactImageDataKey]
        if let contact = try? store.unifiedContact(withIdentifier: contactIdentifier, keysToFetch: keysToFetch as [CNKeyDescriptor]) {
            
            // 从联系人对象中获取图像数据
            if let imageData = contact.imageData {
                
                // 异步加载图像数据到UIImageView中
                DispatchQueue.global().async {
                    let image = UIImage(data: imageData)
                    
                    DispatchQueue.main.async {
                        self.contactImageView.image = image
                    }
                }
            }
        }
    }
    
    // 其他自定义代码...
}