SOLVED: Day 50: CupcakeCorner - Defining order – 100 Days of SwiftUI

SOLVED: Day 50: CupcakeCorner - Defining order

@bkeys818a

Jul '20

I'm confused about the way order is defined throughout the three views in CupcakeCorner.

For the first, ContentView, we defined order. @ObservedObject var order = Order()

Then for the second view, AddressView, we defined order but never assigned a value to it, and then we passed in order from the first view. @ObservedObject var order: Order

But then, for the third view, we defined order, and assigned it a value. @ObservedObject var order = Order() To make it more confusing, order is also passed from the second view into the third.

I don't understand why I can't just define order in the third view using @ObservedObject var order: Order and then pass in the variable from the second view. Why do I have to assign it a value? What really confuses me is if I try that, suddenly order doesn't have any of the values I assigned to it in the past views.

If someone could it explain what's happening here, that would be amazing.

Heres a link to the project.

@delawaremathguy

Jul '20

hi,

the code from @twostraws's 100 Days/Project10 source begins this way on CheckoutView:

struct CheckoutView: View {
    @ObservedObject var order: Order
    // and other stuff

and this seems the right way to do things. but the code in your project begins this way:

struct CheckoutView: View {
    @ObservedObject var order = Order()
    // and other stuff

not sure why you did this (can't recall Paul doing this or why he would do it), but i don't think this will hurt: you've simply given var order a default value that will be overriden by the parameter you pass in.

hope that helps,

DMG

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