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iOS Build a Vending Machine App in Swift Loading Data From a Resource Type Casting

Posted by kelake
kelake
4,223 Points

Access data in this array of class instances

This is the first time I have seen an array of this type. By now accessing and manipulating arrays is not conceptually a big deal but if we just have an array comprised of objects from single class how can we access the data contained within. Example code below:

class Cars {
    var model: String
    var fuelType: String
    var cost: Int
    var type: String

    init(model: String, fuelType: String, cost: Int, type: String) {
        self.cost = cost
        self.fuelType = fuelType
        self.model = model
        self.type = type
    }
}


var carCollection = [Cars(model: "Benz", fuelType: "Gas", cost: 100000, type: "luxury"), Cars(model: "Mercedes", fuelType: "Gas", cost: 110000, type:"sports")]

As an example, how can I access each Cars "fuelType" ? Also, when creating this array (or the array in the video) in Xcode it won't autocomplete.

1 Answer

Jari Koopman
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.a{fill-rule:evenodd;}techdegree seal-36
Jari Koopman
Python Web Development Techdegree Graduate 29,349 Points
Jari Koopman
.a{fill-rule:evenodd;}techdegree seal-36
Jari Koopman
Python Web Development Techdegree Graduate 29,349 Points

Hi Kelake,

Accessing something in an array of custom types, works the same as accessing a builtin type in an array. So, to get the fuel type of all cars, you could do something like this:

for car in carCollection {
    print(car.fuelType)
    // Do more things with the car
}

or, if you wanted to get the fuel type of, say, the first car, you could do this:

carCollection[0].fuelType

For your auto complete issues, Xcode is known to be a bit weird at times... For me personally, 90% of the times, a machine restart fixes the issues.

Hope this has helped enough,

Regards, Jari

kelake
kelake
4,223 Points

Thank you for your reply. This was my understanding. I was getting errors and I was stumped. Perhaps some silly mistake.