Swift Initialization Process Fails

As indicated in Answer to another question, variable declarations with propertyWrapper attributes such as @Binding appear to be normal variable declarations, but the compiler treats them as follows:

 var_selected: Binding <Bool >
    var selected:Bool {
        get{
            _selected.wrappedValue
        }
        set {
            _selected.wrappedValue = newValue
        }
    }

(Same as @State, $selected is also declared computational properties, but @Binding is not very useful and should be omitted.)

In other words, the Bool type property selected is a computational property that does not require initialization, and must be used after all other instance properties have been initialized, as well as the instance method.

On the other hand, _selected that does not appear in the actual code is a retractable property that requires initialization, so you must initialize it before using selected.

Therefore, if you define init yourself, this is what it looks like.

 init(_image:String,_state:Binding<Bool>){
        imageName = image
        _selected=state
    }

In this case, the state in the second argument means that Binding<Bool> type, not Bool type, so true and false type constants cannot initialize, but refers to the type of

Also, Icon is a structure, so if you do not define init yourself,

 init (imageName: String, selected: Binding <Bool >)

The initializer for this signature is automatically generated, so you should use it.