arrays - 将数组值附加到结构

我有以下结构：

    struct PalletScan: Codable {
            var deliveryId: String?
            var userId: String?
            var timestamp: String?
            var tempPalletNr: String?
            var tempLocation: String?
            var tempPalletType: String?
            var pallets: [MovementScan]?

            //coding keys requried for translation API -> struct -> CoreData and CoreData -> struct -> API
            enum CodingKeys: String, CodingKey {
                case deliveryId = "TOID"
                case userId = "UserId"
                case timestamp = "TimeStamp"
            }

    mutating func appendMovementScan() {
                var movementScan = MovementScan()
                movementScan.locationId = self.tempLocation
                movementScan.palletId = self.tempPalletNr
                movementScan.palletType = self.tempPalletType
                movementScan.timestamp = String(Date().timeIntervalSince1970)
                print(movementScan)
                self.pallets?.append(movementScan)

            }

}

但是self.pallets?.append(movementScan)不会向托盘数组添加任何内容。我错过了什么？一定是小事，但找不到错误。

最佳答案

只需更改var pallets: [MovementScan]?
到
var pallets: [MovementScan] = [MovementScan]()
作为@Carcigenicate，您可以调用append on nil value

关于arrays - 将数组值附加到结构，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/50337979/