Swiftui retrieves the missing list view animation

Problem phenomenon

Many beginners SwiftUI My friends are fitting in List There is often a small annoying problem when viewing ：List Content changes but no animation effect .

As shown in the figure above ： User is changing List The item sorting method will change the display order of the list items , This change does not animate in the list .

What's the reason for this ？

The answer is simpler than you think ！

So,Let‘s dive in!

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Problem analysis

1. SwiftUI List animation principle

SwiftUI The animation in the view is driven by state changes ,List No exception .

struct ContentView: View { 
    
    @State