iOS17中CloudKit获取用户姓名：替代弃用的userDiscoverability方案

我尝试从CloudKit中获取当前用户的姓名，但Xcode提示userDiscoverability特性将在iOS 17.0中被弃用，该特性不再受支持，需改用「与其他iCloud用户共享CloudKit数据」特性。

此前使用的函数：

func fetchUserName(completion: @escaping ( _ fullName:String, _ success:Bool) -> Void) {
    container.requestApplicationPermission(.userDiscoverability) { (status, error) in
        self.container.fetchUserRecordID { (record, error) in
            self.container.discoverUserIdentity(withUserRecordID: record!) { (userID, error) in
                var name: String = ""
    
                self.container.accountStatus { accountStatus, error in
                    if let error = error {
                        print(error.localizedDescription)
                    }
                    
                }

                guard let givenName = userID?.nameComponents?.givenName,
                      let familyName = userID?.nameComponents?.familyName else {
                    completion("", false)
                    print("Unable to fetch user name")
                    return
                }
                
                let fullName: String = givenName + " " + familyName
                name = fullName

                DispatchQueue.main.async {
                    completion(name, true)
                }
            }
        }
    }
}

解决方案 #

• iOS 17及以后版本，获取当前用户姓名需使用CKUserIdentityLookupInfo结合discoverUserIdentities方法，无需再请求userDiscoverability权限，但要确保项目开启「iCloud云共享」能力。

• 替代实现代码：

func fetchCurrentUserName(completion: @escaping (String?, Bool) -> Void) {
    container.fetchUserRecordID { [weak self] recordID, error in
        guard let self = self, let recordID = recordID else {
            completion(nil, false)
            return
        }
        
        let lookupInfo = CKUserIdentityLookupInfo(userRecordID: recordID)
        
        self.container.discoverUserIdentities(with: [lookupInfo]) { identities, error in
            if let error = error {
                print("查询用户信息失败: \(error.localizedDescription)")
                completion(nil, false)
                return
            }
            
            guard let identity = identities?.first,
                  let givenName = identity.nameComponents?.givenName,
                  let familyName = identity.nameComponents?.familyName else {
                completion(nil, false)
                return
            }
            
            let fullName = "\(givenName) \(familyName)"
            DispatchQueue.main.async {
                completion(fullName, true)
            }
        }
    }
}

• 额外注意事项：
  • 确保项目的「Signing & Capabilities」中已添加「iCloud」能力，并勾选「CloudKit」和「CloudKit Sharing」选项。
  • 移除原代码中requestApplicationPermission(.userDiscoverability)的调用，该权限在iOS 17已失效。
  • 异步回调中使用weak self避免循环引用。

内容的提问来源于stack exchange，提问作者ChickenRei