swift – can I call a struct default memberwise init from my custom init method?

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Add your own initializer as an extension to your struct. Extensions cannot remove existing functionalities, so it will preserve struct’s default initializer.

struct OrderFill {
    let price: Int
    let qty: Int
    let timeStamp: NSDate
}

extension OrderFill {

    init(dict: [String: AnyObject]) throws {
        self.init(
            price: dict["price"] as! Int,
            qty: dict["qty"] as! Int,
            timeStamp: try parseDate(dict["ts"] as! String)
        )
    }
}

let o = OrderFill(someDict)

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