Download length from track makes app to freeze SwiftUI

I've been searching for a method how to display track length from URL that is stored on the server. I found this method in Swift: AVPlayer - How to get length of mp3 file from URL? working fine:

let item = AVPlayerItem(url: url)
let duration = Double(item.asset.duration.value) / Double(item.asset.duration.timescale)

Here's the problem: this peace of code completely freezes the app when I navigate to views where it shows. How can I fix this problem?

Adding the function:

func getDuration(url: URL) -> Double {
    let item = AVPlayerItem(url: url)
    let duration = Double(item.asset.duration.value) / Double(item.asset.duration.timescale)
    return duration
}

Text itself:

                        Text(String(audioManager.getDuration(url: URL(string: "http://gameleprilucky.ru/soungs/" + (data.linkSoung ?? "abob"))!)))
                            .font(.custom("Manrope-Medium", size: 12))
                            .foregroundColor(.white)

Solution

Those lines certainly shouldn't be called on UI thread and it is certain to cause unresponsive interface.

You should to the following:

add @State variable called e.g. duration
bind the Text to that variable
calculate the duration on non-UI thread with dispatching (where to call this code is unclear from your code, but you would probably use onAppear)
assign calculated value to duration on UI thread (again by using main dispatcher)