Calling Async Functions in SwiftUI

Question

marcofusco111 OP

Created Jan ’25

Replies 1

Boosts 0

Participants 2

Hi,

I'd like to call an Async function upon a state change or onAppear() but I'm not sure how to do so. Below is my code:

.onAppear() {
    if !subscribed {
         await Subscriptions().checkSubscriptionStatus()
    }
}

class Subscriptions {
    var subscribed = UserDefaults.standard.bool(forKey: "subscribed")
    
    func checkSubscriptionStatus() async {
        if !subscribed {
            await loadProducts()
        }
    }
    
    func loadProducts() async {
        for await purchaseIntent in PurchaseIntent.intents {
            // Complete the purchase workflow.
            await purchaseProduct(purchaseIntent.product)
        }
    }
    
    func purchaseProduct(_ product: Product) async {
        // Complete the purchase workflow.
        do {
            try await product.purchase()
        }
        catch {
            // Add your error handling here.
        }
        // Add your remaining purchase workflow here.
    }
}

Boost

Answer 1

DTS Engineer OP

Apple

Jan ’25

Use the task(priority:_:) modifier. It allows you to perform an asynchronous task with a lifetime that matches that of the view.

Discover concurrency in SwiftUI dives deep into how you can use Swift's concurrency features in your SwiftUI app. It's a great resource you should review.

0