如何在Did DeSelect上删除字典数组中的值？

Question

我正在用OrderDetailsArray填充我的tableView。然后在DidSelect上，我给reorderArray增加了价值。如何在点击DidDeSelect时从数组中删除值

我的tableView委托的功能如下：

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let object = orderDetailsArray.object(at: (indexPath as NSIndexPath).row) as! NSDictionary

    let storeID = UserDefaults.standard.value(forKey: DefaultsKey.storeID.rawValue) as! Int
    let barcode = object["barcode"] as! String
    let mrp = object["mrp"] as! String
    let productDiscount = object["product_discount"] as! String

    reorderDictionary.setObject((storeID), forKey: "store_id" as NSCopying)
    reorderDictionary.setObject((barcode), forKey: "barcode" as NSCopying)
    reorderDictionary.setObject((mrp), forKey: "mrp" as NSCopying)
    reorderDictionary.setObject((productDiscount), forKey: "product_discount" as NSCopying)

    reorderArray.add(reorderDictionary)
    let cell = tableView.cellForRow(at: indexPath) as! OrderHistoryProductDetailsTableViewCell
    cell.contentView.backgroundColor = UIColor.red
    print(reorderArray)
}

func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
    let cell = tableView.cellForRow(at: indexPath) as! OrderHistoryProductDetailsTableViewCell
    let object = reorderArray.object(at: (indexPath as NSIndexPath).row) as! NSDictionary
    reorderArray.remove(object)
    cell.contentView.backgroundColor = UIColor.clear
    print(reorderArray)
}

reorderArray为NSMutableArray()

Answer 1

除非有充分的理由，否则您不应该在Swift中使用诸如NSMutableArray或NSDictionary之类的基础类，但简单的答案是您可以使用remove从NSMutableArray中删除对象的实例，并且您可以很容易地从索引路径中找到相关对象：

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let cell = tableView.cellForRow(at: indexPath) as! OrderHistoryProductDetailsTableViewCell
    let object = orderDetailsArray.object(at: (indexPath as NSIndexPath).row) as! NSDictionary
    reorderArray.add(object)
    cell.contentView.backgroundColor = UIColor.red
    print(reorderArray)
}

func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
    let object = orderDetailsArray.object(at: (indexPath as NSIndexPath).row) as! NSDictionary
    reorderArray.remove(object)
    let cell = tableView.cellForRow(at: indexPath) as! OrderHistoryProductDetailsTableViewCell
    cell.contentView.backgroundColor = UIColor.clear
    print(reorderArray)
}

Answer 2

在Swift 3.0中，你可以尝试这样做，当使用Array of Dictionary时，你可以这样做。

func tableView(_ tableView: UITableView, didDeSelectRowAt indexPath: IndexPath)
 {
       let dicDetails = arrUserDetails[indexPath.row] as! NSMutableDictionary
       dicDetails.removeObject(forKey: "your_Key")

 }

Answer 3

重试一次

 1.Create One more array globally and store indexpaths insted of reorderArray

OR

2.Apply this lines of code in TableViewCellForRowAtIndexPath:

if reorderArray.contains(reorderDictionary){
   cell.contentView.backgroundColor = UIColor.red
}else{
   cell.contentView.backgroundColor = UIColor.clear
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
     let object = orderDetailsArray.object(at: (indexPath as NSIndexPath).row) as! NSDictionary

     let storeID = UserDefaults.standard.value(forKey: DefaultsKey.storeID.rawValue) as! Int
     let barcode = object["barcode"] as! String
     let mrp = object["mrp"] as! String
     let productDiscount = object["product_discount"] as! String

     reorderDictionary.setObject((storeID), forKey: "store_id" as NSCopying)
     reorderDictionary.setObject((barcode), forKey: "barcode" as NSCopying)
     reorderDictionary.setObject((mrp), forKey: "mrp" as NSCopying)
     reorderDictionary.setObject((productDiscount), forKey: "product_discount" as NSCopying)
     let cell = tableView.cellForRow(at: indexPath) as! OrderHistoryProductDetailsTableViewCell
     if reorderArray.contains(reorderDictionary){
        reorderArray.remove(reorderDictionary)
        cell.contentView.backgroundColor = UIColor.clear
     }else{
      reorderArray.add(reorderDictionary)
      cell.contentView.backgroundColor = UIColor.red
     }

    print(reorderArray)
}