以给定格式创建JSON Swift

Question

我想以下面的格式创建JSON。

{ 
    "userID": "1234", 
    "cart_items": { 
    "1": { 
     "item_Seq_no": 1, 
     "catalog_id": 234, 
     "qty": 1, 
     "amount": 100 
    }, 
    "2": { 
     "item_Seq_no": 2, 
     "catalog_id": 45, 
     "qty": 3, 
     "amount": 300 
    }, 
    "3": { 
     "item_Seq_no": 3, 
     "catalog_id": 177, 
     "qty": 2, 
     "amount": 200 
    } 
    } 
} 

我在下面写的代码并不是完全以上述格式创建的。

let arr:NSMutableArray = [] 
    for i in 0...KCatalog.catalogValues.count-1 
    { 
     let seqnum1 = String(i + 1) 
     let param2:[String: AnyObject] = [ 
      seqnum1: [ 
       "item_Seq_no" : i+1, 
       "catalog_id" : ((KCatalog.catalogValues[i] as! catalogInfo).catalog_id), 
       "qty" : orderedQuantity[i], 
       "amount" : totalQuantityPrice[i], 
      ], 
     ]    
     arr.addObject(param2) 
    } 

    print(arr) 

    let param1:NSMutableDictionary = [ 

     "cart_items" : arr, 
     "userID":"asdf", 
     ] 
    print(param1) 
    let data1 = try! NSJSONSerialization.dataWithJSONObject(param1, options: NSJSONWritingOptions.PrettyPrinted) 

    let json = String(data: data1, encoding: NSUTF8StringEncoding) 
    if let json = json { 
     print(json) 
    } 

我想知道给定的格式是否正确。如果是的话，请给我建议，使其在上述格式

输出我得到是

{ 
    "userID": "asdf", 
    "cart_items": [ 
    { 
     "1": { 
     "item_Seq_no": 1, 
     "amount": 10, 
     "catalog_id": "1", 
     "qty": 1 
     } 
    }, 
    { 
     "2": { 
     "item_Seq_no": 2, 
     "amount": 15, 
     "catalog_id": "2", 
     "qty": 1 
     } 
    }, 
    { 
     "3": { 
     "item_Seq_no": 3, 
     "amount": 0, 
     "catalog_id": "3", 
     "qty": 0 
     } 
    } 
    ] 
} 

据萨曼莎回答我得到以下输出

{ 
    "userID": "asdf", 
    "cart_items": { 
    "1": { 
     "1": { 
     "item_Seq_no": 1, 
     "amount": 10, 
     "catalog_id": "1", 
     "qty": 1 
     } 
    }, 
    "2": { 
     "2": { 
     "item_Seq_no": 2, 
     "amount": 15, 
     "catalog_id": "2", 
     "qty": 1 
     } 
    }, 
    "3": { 
     "3": { 
     "item_Seq_no": 3, 
     "amount": 0, 
     "catalog_id": "3", 
     "qty": 0 
     } 
    } 
    } 
} 

Answer 1

cart_items应该是一本字典，而不是一个阵列。

var cartItems = [String: AnyObject]() 
for i in 0...KCatalog.catalogValues.count-1 
    { 
     let seqnum1 = String(i + 1) 
     let param2:[String: AnyObject] = [ 
       "item_Seq_no" : i+1, 
       "catalog_id" : ((KCatalog.catalogValues[i] as! catalogInfo).catalog_id), 
       "qty" : orderedQuantity[i], 
       "amount" : totalQuantityPrice[i], 
     ]    
     cartItems[seqnum1] = param2 
    } 

再后来

let param1:NSMutableDictionary = [ 
     "cart_items" : cartItems, 
     "userID":"asdf", 
     ] 

Answer 2

基于@Samantha回答以下这里是雨燕3.0代码。

var cartDictionaryArr = [String: AnyObject]() 
    for i in 0...KCatalog.catalogValues.count-1 
    { 
     let keyValue = String(i + 1) 
     let itemsArr :[String: AnyObject] = [ 
      "item_Seq_no" : i+1, 
      "catalog_id" : ((KCatalog.catalogValues[i] as! catalogInfo).catalog_id), 
      "qty"   : orderedQuantity[i], 
      "amount"  : totalQuantityPrice[i] 
     ] 
     cartDictionaryArr[keyValue] = itemsArr as AnyObject 
    } 

    print(cartDictionaryArr) 

    let finalDict:NSMutableDictionary = [ 
     "cart_items" : cartDictionaryArr, 
     "userID":"123", 
     ] 

    print(finalDict) 
    let data1 = try! JSONSerialization.data(withJSONObject: finalDict, options: JSONSerialization.WritingOptions.prettyPrinted) 

    let json = String(data: data1, encoding: String.Encoding.utf8) 
    if let json = json { 
     print(json) 
    } 

这里是斯威夫特2工作守则 -

var cartDictionaryArr = [String: AnyObject]() 
    for i in 0...KCatalog.catalogValues.count-1 
     { 
      let keyValue = String(i + 1) 
      let itemsArr:[String: AnyObject] = [ 
        "item_Seq_no" : i+1, 
        "catalog_id" : ((KCatalog.catalogValues[i] as! catalogInfo).catalog_id), 
        "qty"   : orderedQuantity[i], 
        "amount"  : totalQuantityPrice[i], 
       ]   
      cartDictionaryArr[keyValue] = itemsArr as AnyObject 
     } 

     print(cartDictionaryArr) 

     let finalDict:NSMutableDictionary = [ 
     "cart_items" : cartDictionaryArr, 
     "userID":"123", 
     ] 
     print(finalDict) 

     let data1 = try! NSJSONSerialization.dataWithJSONObject(finalDict, options: NSJSONWritingOptions.PrettyPrinted) 

     let json = String(data: data1, encoding: NSUTF8StringEncoding) 
     if let json = json { 
      print(json) 
     }