在 Class - Swift 中初始化数组

Question

I am strugeling to work with the array accounts, I don't really know how I should handle it, how I should initialize it in order to correctly append the object accountFromJohn to the list accounts.

class Bank {
    var bicCode : String
    var address : String
    var customer : Customer
    var accounts : [BankAccount] = []
    init(bicCode : String, address : String, customer : Customer) {
        self.bicCode = bicCode
        self.address = address
        self.customer = customer
    }
}

var accountFromJohn = BankAccount(accountNumber : 192, balance : 20, customer : John)
var ING = Bank(bicCode : "LUING18", address : "Avenue du Swing", customer : Paul)

ING.accounts.append(accountFromJohn)

print(ING.accounts) // output : [main.BankAccount] ; wanted output : [accountFromJohn]

Best Reagars, Thanks in advance.

Answer 1

Everything is fine.

The array contains an instance of BankAccount rather than an arbitrary variable name accountFromJohn .

Prove it by printing

print(ING.accounts.first?.customer ?? "Accounts is empty")

---

However it's possible to print accountFromJohn . in BankAccount adopt CustomStringConvertible and add the property

var description : String {
    return "accountFrom\(customer)"
}

Answer 2

For this as one approach you can assign values to accounts while initialisation of objects.

class Bank {
    var bicCode : String
    var address : String
    var customer : Customer
    var accounts : [BankAccount]
    init(bicCode : String, address : String, customer : Customer, accounts: [BankAccount]) {
        self.bicCode = bicCode
        self.address = address
        self.customer = customer
        self.accounts = accounts
    }
}

Then you can work with the objects properly.

var accountFromJohn = [BankAccount(accountNumber : 192, balance : 20, customer : John)]
var ING = Bank(bicCode : "LUING18", address : "Avenue du Swing", customer : Paul, accounts: accountFromJohn)

And then you can append data to Bank list like yourObject.append(ING) , if you want to change values of accounts, you can do it by yourObject[desiredElement].accounts.append(accountsData) and if you need to retrieve values yourObject[desiredElement].accounts