在Swift字典数组中查找并替换值

Question

如何搜索匹配的字典数组并将该匹配替换为另一个字典？

哪里lineItemsArray:Array是字典的一个数组,我期待搜索数组中的元素进行匹配,返回匹配的索引,然后更换字典,一个新的,索引.数组中的每个字典都包含一个recordId用于搜索的键.每个recordId都是唯一的,搜索将始终返回单个结果.

将替换匹配记录的新数据由Web服务生成并作为字典返回.(见下文)

以下是我的具体问题:

• 如何搜索字典数组以进行匹配？
• 如何返回该匹配的索引路径？
• 在匹配索引处替换字典的最有效方式是什么？

这是一个lineItemsArray样子:

[{
    buyFromCompanyId = 1;
    buyFromJobId = 5276;
    comment = "";
    componentId = 2331;
    description = "";
    fulfillmentStatus = 0;
    globalJobId = 2470;
    inventoryItemId = 1824;
    isSerialized = 1;
    itemClass = 0;
    itemQty = 2;
    lineItemId = 50853;
    priceRecordId = 152693;
    productName = "Bose L1 Compact";
    qtyAlreadyPulled = 0;
    qtyRate1 = 3;
    qtyRate2 = "";
    qtyTotalStock = "";
    rate1 = "";
    rate2 = "";
    sellToCompanyId = 1;
}, {
    buyFromCompanyId = 1;
    buyFromJobId = 5276;
    comment = "";
    componentId = "";
    description = "";
    fulfillmentStatus = 0;
    globalJobId = 2470;
    inventoryItemId = 2010;
    isSerialized = "";
    itemClass = "";
    itemQty = 2;
    lineItemId = 50854;
    priceRecordId = 152695;
    productName = "C13 IEC Cable (Standard)";
    qtyAlreadyPulled = 0;
    qtyRate1 = "";
    qtyRate2 = "";
    qtyTotalStock = 23;

}, {
    buyFromCompanyId = 1;
    buyFromJobId = 5276;
    comment = "";
    componentId = "";
    description = "";
    fulfillmentStatus = 0;
    globalJobId = 2470;
    inventoryItemId = 2046;
    isSerialized = 1;
    itemClass = "";
    itemQty = 2;
    lineItemId = 50855;
    priceRecordId = 152697;
    productName = "L1 compact amp unit";
    qtyAlreadyPulled = 0;
    qtyRate1 = "";
    qtyRate2 = "";
    qtyTotalStock = 1;
}]

Answer 1

不幸的是,Swift的全局find方法寻找特定值而不是匹配谓词的值.你可以用这种方式定义自己的:

func find<C: CollectionType>(collection: C, predicate: (C.Generator.Element) -> Bool) -> C.Index? {
    for index in collection.startIndex ..< collection.endIndex {
        if predicate(collection[index]) {
            return index
        }
    }
    return nil
}

然后你可以找到有问题的字典的索引并直接替换它:

let index = find(lineItemsArray) { $0["recordId"] == replaceKey }
if let index = index {
    lineItemsArray[index] = newDictionary
}