修改json对象数组

问题描述

我有一个json对象列表，我需要修改它们中的每个值。我正在以下代码中访问此json对象列表：

            if let json = try JSONSerialization.jsonObject(with: data,options: []) as? [String: Any] {
            
            let objects = json["data"] as? [String: Any]
            if let accounts = objects?["accounts"] as? [[String:Any]]{
                
                print("Accounts: \(accounts)")
                for account in accounts {
                    account["balance"] = nil
                }
            }
            
            modifiedData = try JSONSerialization.data(withJSONObject: json,options: [])
        }

但是accounts数组是不可变的。我尝试过强制转换为NSMutableDictionary和NSMutableArray，但似乎无法使其正常工作。有人有提示吗？

解决方法

您需要使用var声明的变量，而不是通过索引访问accounts数组

if var json = try JSONSerialization.jsonObject(with: data,options: []) as? [String: Any] {
    var objects = json["data"] as? [String: Any]
    if var accounts = objects?["accounts"] as? [[String:Any]] {
        for index in 0..<accounts.count {
            accounts[index]["balance"] = 0
        }
        objects?["accounts"] = accounts
    }
    json["data"] = objects
}