CODEWITHSUNDEEP
swiftui
swiftPunk
swiftPunk

Reputation: 1

Custom Binding initialisation

I want control the passed value to Binding for custom initializing, I am using this down code, xcode throw me this:

enter image description here

need help to solve the problem, thanks for help.

    import SwiftUI

struct ContentView: View {
    
    @State private var int: Int = Int()
    
    var body: some View {

        BindingView(int: $int)
        
    }
}


struct BindingView: View {
    
    @Binding var int: Int
    
    init(int: Binding<Int>) {
        
        if int == 0 {               // <<:  Here
            
            _int = 100              // <<:  Here
            
        }
        else {
            
            _int = int

        }

    }

    var body: some View {
        
        Text(int.description)

    }
}

Upvotes: 0

Views: 65

Answers (1)

jnpdx
jnpdx

Reputation: 52387

You can't access Int directly like that for comparison, since it's a @Binding. Instead, you'll want to access its wrappedValue:

You're also running into a couple funny things just from naming your input parameter (int) the same as your stored property, but it's easily fixable. Here's one variation:

struct BindingView: View {
    
    @Binding var int: Int
    
    init(int: Binding<Int>) {
        
        if int.wrappedValue == 0 {               // <<:  Here
            
            int.wrappedValue = 100              // <<:  Here
            
        }
        
        self._int = int

    }

    var body: some View {
        
        Text(int.description)

    }
}

Note that there's some tricky subtlety here: @Binding lets you directly access the underlying value, while with Binding<Int> you have to use the wrappedValue property.

Upvotes: 1

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