Google Auth签名不明确地引用了成员“subscript”

// 错误的示例
let user = users["subscript"]  // 这里 "subscript" 应该是一个实际的键

// 正确的示例
let user = users["actualUserID"]

// 错误的示例
let user: User = users[0]  // 如果 users 是一个字典，这会是错误的

// 正确的示例
let user: User = users["userID"] as? User ?? User()

if let user = users["userID"] as? User {
    // 使用 user
} else {
    // 处理用户不存在的情况
}

pod update GoogleSignIn

do {
    // 你的代码
} catch {
    print(error)
    print(error.localizedDescription)
}

import GoogleSignIn

class ViewController: UIViewController, GIDSignInDelegate {
    var googleSignIn: GIDSignIn!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        googleSignIn = GIDSignIn.sharedInstance()
        googleSignIn.delegate = self
        googleSignIn.signIn()
    }

    func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error?) {
        if let error = error {
            print("Google Sign-In error: \(error.localizedDescription)")
            return
        }
        
        guard let userID = user.userID else { return }
        guard let fullName = user.profile.name else { return }
        guard let email = user.profile.email else { return }
        
        print("User ID: \(userID)")
        print("Full Name: \(fullName)")
        print("Email: \(email)")
    }
}