在Swift中异步合并两个字典

import Foundation

// 定义两个字典
let dict1 = ["a": 1, "b": 2]
let dict2 = ["b": 3, "c": 4]

// 异步合并字典的函数
func mergeDictionariesAsync(dict1: [String: Int], dict2: [String: Int], completion: @escaping ([String: Int]?) -> Void) {
    DispatchQueue.global(qos: .userInitiated).async {
        var mergedDict = dict1
        for (key, value) in dict2 {
            mergedDict[key] = value // 如果键相同，dict2的值会覆盖dict1的值
        }
        completion(mergedDict)
    }
}

// 调用异步合并函数
mergeDictionariesAsync(dict1: dict1, dict2: dict2) { mergedDict in
    if let mergedDict = mergedDict {
        print("Merged Dictionary: \(mergedDict)")
    } else {
        print("Failed to merge dictionaries")
    }
}

let queue = DispatchQueue(label: "com.example.queue", attributes: .concurrent)

func safeMergeDictionaries(dict1: [String: Int], dict2: [String: Int], completion: @escaping ([String: Int]?) -> Void) {
    queue.async(flags: .barrier) {
        var mergedDict = dict1
        for (key, value) in dict2 {
            mergedDict[key] = value
        }
        DispatchQueue.main.async {
            completion(mergedDict)
        }
    }
}