对此使用firstIndex

let index = dictionaryitems.firstIndex(where: {$0.key == "pen"})

您可以通过以下方式获取键或值索引

let index = Array(Dictionary.keys).index(of: key/value)

这样，您将获得一个可选值，您可以使用if-let或guard语句展开该值以供将来使用

var dictionaryitems = ["computer":"something to make work easy","pen":"used for writing something"]

if let index = dictionaryitems.index(forKey: "pen")  {
    print(dictionaryitems[index].key, ":", dictionaryitems[index].value)
}

这是一个如何使用swift〉获取词典索引的示例

if let index = carDataArray?.index(where: {$0["carName"] as! String == "BMW"}) {
            print("Car Found")
        }