ios - 遍历字典键数组以检查 (Int) 键是否可用

Question

我有一个字典数组 table

let table: [
              "0": ["a": "30","b": "21"],
              "1": ["a": "31","b": "22"],
              "2": ["a": "32","b": "23"],
              "3": ["a": "33","b": "24"],
              "4": ["a": "34","b": "24"],
            ]

因此，我想遍历每个键(它们始终是 Int 类型(通常显示索引路径))。我可以遍历这些键吗？

喜欢:

var keys:Int = 0
// Iterate through the dictionary
for (key) in tblData {
    //What should i check for here?? 
}

解决方案:我能够通过你的所有建议得到它，所以谢谢大家。我执行了以下操作来检查字典键是否为 Int 以及它是否可用，但我仍然无法打破循环:

let keys = (demo["data"]!["table"]!.keys).sort()

 for k in keys{
   var num = Int(k)
   if num != nil {
     print("Yeah! its an Integer")
   }
   else {
    print("uh-oh! not an Integer")
  }
}

但我仍然无法打破循环。我应该在哪里使用 break 以及条件是什么。谁能给我建议？

Swift 版本:2.3，Xcode 版本:7.3

Answer 1

试试这个:

let dic = [
    "data": [
        "table": [
            0: [
                "service_details": "(3 months)",
                "bill_date": "2016-10-27"
            ],
            1: [
                "service_details": "(3 months)",
                "bill_date": "2016-07-26"
            ],
            "2": [
                "service_details": "(1 year)",
                "bill_date": "2015-12-29"
            ],
            3: [
                "service_details": "Installation charge",
                "bill_date": "2015-07-27"
            ],
            "4": [
                "service_details": "(1 year)",
                "bill_date": "2015-07-27"
            ]
        ]
    ]
]

//遍历字典

for (key,value) in dic["data"]!["table"]! {
    if let str = key as? Int {
        print("Key is --> \(key)")
        print("Service Detail --> \(value["service_details"]!)")
        print("Bill Date --> \(value["bill_date"]!)")
        print("---------------------------------------------")
   }
   else {
        //print("---------------If You get any other type it point here... \n index is --> \(key) \n -------------------")
   }

输出:

关键是 --> 3

服务详情-->安装费

账单日期 --> 2015-07-27

---

关键是 --> 0

服务详情 -->(3 个月)

账单日期 --> 2016-10-27

---

关键是 --> 1

服务详情 -->(3 个月)

账单日期 --> 2016-07-26

---