如何使用swift获取字典中的索引值

Question

因为我是快速编程语言的新手。我正在使用两个项目的字典，现在我需要获取特定字典值的索引路径。我正在使用以下代码

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

Answer 1

为此使用 firstIndex

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

Answer 2

您可以通过

获取键或值的索引

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

由此您将获得一个可选值，您可以使用 if-let 或 guard 语句解包以供进一步使用

Answer 3

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)
}

Answer 4

这是一个如何使用 swift 获取字典索引的示例 >

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

Answer 5

为此使用枚举（）：

for (index, key_value) in dictionaryitems.enumerated(){
    print("\(index) : \(key_value)")
}

输出：

0 : (key: "pen", value: "used for writing something")
1 : (key: "computer", value: "something to make work easy")

所以它会很容易理解。