ios - 如何在 swift 4 中过滤二维模型数组，

Question

我是这样做的:-

    let dataToSend = self.allOrders.filter { (ordersForOneDate) -> Bool in

            return ordersForOneDate.filter({ (myOrder) -> Bool in

                if myOrder.is_request == "1" &&
                    myOrder.order_status != "confirmed" &&
                    myOrder.order_status != "completed" {

                    return true
                } else {
                    return false
                }
            })
        }

但是出现错误

Cannot convert value of type '[MyOrdersModel]' to closure result type 'Bool'

Answer 1

如果你想从二维数组中过滤掉项目，那么你需要映射外部数组而不是过滤它。您也可以删除空数组。尝试类似的东西:

func filterMy2DArray(allOrders: [[Order]], includesEmptyArrays includeEmpty: Bool = false) -> [[Order]] {
    let dataToSend: [[Order]] = allOrders.compactMap { ordersForOneDate in
        let filtered = ordersForOneDate.filter({ myOrder in
            if myOrder.is_request == "1" &&
                myOrder.order_status != "confirmed" &&
                myOrder.order_status != "completed" {
                return true
            } else {
                return false
            }
        })
        if includeEmpty {
            return filtered
        } else {
            return filtered.isEmpty ? nil : filtered
        }
    }
    return dataToSend
}

所以现在内部数组被过滤以获取您想要的项目。然后检查(if includeEmpty if false)数组是否为空，如果是则返回 nil。 compactMap 将做的是构造 block 提供的数组数组，但会忽略那些 nil 的数组。