如何修复编码错误：“使用未解析的标识符 SafariVC”。错误在“SafariVC.delegate = self”旁边答案

【问题标题】：How do I fix the coding error: " Use of Unresolved Identifier SafariVC". The error is next to "SafariVC.delegate = self"如何修复编码错误：“使用未解析的标识符 SafariVC”。错误在“SafariVC.delegate = self”旁边
【发布时间】：2026-01-03 17:30:01
【问题描述】：

我正在我的 DetailVC 中设置 SFSafariViewController。我需要在哪里设置编码来解决错误：

使用未解析的标识符 SafariVC

错误显示在旁边：safariVC.delegate = self。

import SafariServices
import UIKit

class StateDetailViewController: UIViewController, SFSafariViewControllerDelegate {

    @IBAction func watchButtonTapped(_ sender: SAButton) {
      if let url = URL(string: self.state!.url) {
        UIApplication.shared.open(url, options: [:], completionHandler: nil)
        let safariVC = SFSafariViewController(url: url)
        present(safariVC, animated: true)
      }
      safariVC.delegate = self
  }
  @IBOutlet weak var stateTitleTextLabel: UILabel!
  @IBOutlet weak var stateDetailTextTitleLabel: UILabel!
  @IBOutlet weak var stateDescriptionTextView: UITextView!

  var state: State?

  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.

    title = "Reciprocal Details"

    stateTitleTextLabel.text = state?.title
    stateDetailTextTitleLabel.text = state?.detailText
    stateDescriptionTextView.text = state?.description

    func safariViewControllerDidFinish(_ controller: SFSafariViewController) {
      controller.dismiss(animated: true, completion: nil)
    }
  }

}

【问题讨论】：

修复缩进问题很明显（假设您熟悉变量范围）。
我会用谷歌搜索，因为我不知道，因为我仍然是 swift 的新手，也是我第一次编码。对不起！
你能告诉我显而易见的事情吗？我正在努力学习正确的方法！谢谢
变量只能在声明它的大括号内使用。

标签： swift error-handling

【解决方案1】：

改变

  if let url = URL(string: self.state!.url) {
    UIApplication.shared.open(url, options: [:], completionHandler: nil)
    let safariVC = SFSafariViewController(url: url)
    present(safariVC, animated: true)
  }
  safariVC.delegate = self

到

  if let url = URL(string: self.state!.url) {
    UIApplication.shared.open(url, options: [:], completionHandler: nil)
    let safariVC = SFSafariViewController(url: url)
    safariVC.delegate = self
    present(safariVC, animated: true)
  }

【讨论】：