背景
我有一个简单的账单拆分应用程序,允许用户将餐点分配给多个人或多个用户。当膳食分配给多个人时,价格将相应地分配。餐(其中包含商品名称和价格,行是用户,部分是用户。
当我删除一行时,我想删除该行,并更新或更改某些其他值(从用户删除某项物品时,我基本上是想将价格重新分配给少一位的人)。我的数据模型是multidimensional
array
。在这里:
struct UserModel {
var name: String
var itemModels = [ItemModel]()
init(name: String, itemModels: [ItemModel]? = nil) {
self.name = name
if let itemModels = itemModels {
self.itemModels = itemModels
}
}
}
struct ItemModel {
var itemName: String
var price: Double
init(itemName: String, price: Double) {
self.itemName = itemName
self.price = price
}
}
class Data {
static var userModels = [UserModel]()
static var itemModels = [ItemModel]()
}
例如,在trailingSwipeActionsConfigurationForRowAt
func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
let delete = UIContextualAction(style: .destructive, title: "Delete") { (contextualAction, view, actionPerformed: @escaping (Bool) -> ()) in
let user = Data.userModels[indexPath.section].name
let item = Data.userModels[indexPath.section].itemModels[indexPath.row].itemName
let price = Data.userModels[indexPath.section].itemModels[indexPath.row].price
ItemModelFunctions.removeFromUser(from: indexPath.section, remove: indexPath.row)
var duplicate = Data.userModels.filter({$0.itemModels.contains(where: {$0.itemName == item})}).filter({$0.name != user})
for i in 0..<duplicate.count {
???
}
tableView.reloadData()
actionPerformed(true)
}
return UISwipeActionsConfiguration(actions: [delete])
}
变量var duplicate
返回在indexPath.row
具有相同项目的其他用户的数组,但不返回具有该项目的用户(indexPath.section
)。我知道这听起来确实很混乱,但是如果需要,我可以提供更多代码或print
语句。
我还想在for loop
中做这样的事情:
for i in 0..<duplicate.count {
let oldPrice = duplicate[i].price
let newPrice = oldPrice * duplicate.count
duplicate[i].price = newPrice
}
但是我无法获得价格。我相信需要indexPath.section
和indexPath.row
。
如果您已经做到了,那就感谢您抽出宝贵的时间。我觉得我需要一个嵌套循环,但是我不确定如何实现它。如果还有其他更简单的方法可以实现这一目标,我欢迎您提出任何建议。
非常感谢您!
编辑:
标记的答案有效!万一其他人遇到类似的问题,这就是我的最终代码在trailingSwipeActionsConfigurationForRowAt
中的样子:
func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
let delete = UIContextualAction(style: .destructive, title: "Delete") { (contextualAction, view, actionPerformed: @escaping (Bool) -> ()) in
let item = Data.userModels[indexPath.section].itemModels[indexPath.row]
ItemModelFunctions.removeFromUser(from: indexPath.section, remove: indexPath.row)
let duplicate = Data.userModels.filter({$0.itemModels.contains(item)})
for i in 0..<Data.userModels.count {
if let idx = Data.userModels[i].itemModels.firstIndex(of: item) {
let oldPrice = Data.userModels[i].itemModels[idx].price
let newPrice = oldPrice * Double(duplicate.count+1)
Data.userModels[i].itemModels[idx].price = newPrice / Double(duplicate.count)
}
}
tableView.reloadData()
actionPerformed(true)
}
return UISwipeActionsConfiguration(actions: [delete])
}
答案 0 :(得分:2)
也许您可以尝试一下。祝您好运,如果无法解决,请发表评论。我是Swift的新手:)
let actualItem = Data.userModels[indexPath.section].itemModels[indexPath.row]
for i in 0..<duplicate.count {
if let idx = duplicate[i].itemModels.firstIndex(of: actualItem) {
let oldPrice = duplicate[i].itemModels[idx].price
duplicate[i].itemModels[idx].price = oldPrice * duplicate.count
}
}