How to select an item in ScrollView with SwiftUI?

Question

what I am trying to accomplish is have a loop of items where I am able to tap one and it gets bigger programmatically once tapped

here is my code and my results so far:

struct ContentView: View {
    
    @State var emojisArray = ["📚", "🎹", "🎯", "💻"]
    @State var selectedIndex = 0
    
    var body: some View {
        VStack {
            ScrollView(.horizontal) {
                
                HStack {
                    
                    ForEach(0..<emojisArray.count) { item in
                        
                        
                        emojiView(emoji: self.emojisArray[item],
                                  isSelected: item == self.selectedIndex ? true : false)
                            
                            .onTapGesture {
                                print (item)
                                self.selectedIndex = item
                                
                                
                        }
                        
                    }
                    
                }
                
                
            }
        .onAppear()
            .frame(height:160)
            
            VStack{
                Text("selcted item:")
                Text("\(self.emojisArray[self.selectedIndex])")
            }
            
        }
        
        
    }
}

where emojiView is :

struct emojiView: View {
    
    var emoji : String
    @State var isSelected : Bool
    
    var body: some View {
        Text(emoji)
            .font(isSelected ? .system(size: 120) : .system(size: 45))
    }
}

I guess the problem is that the ScrollView does't reload itself

Asperi · Accepted Answer · 2021-12-15 13:26:40Z

1

Just remove @State in emojiView

struct emojiView: View {

    var emoji : String
    var isSelected : Bool      // << here !!

    var body: some View {
        Text(emoji)
            .font(isSelected ? .system(size: 120) : .system(size: 45))
    }
}

Tested with Xcode 12 / iOS 14

edited Dec 15, 2021 at 13:26

answered Aug 7, 2020 at 7:38

Asperi

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3 Comments

Rich Over a year ago

oh yeah it works but only in the simulator not in the preview, I should have imagine,

Duck Over a year ago

this is not really selecting the element. This is a visual hack to give the impression the element is selected.

SaganRitual Over a year ago

@Duck "selected" doesn't have a universal meaning; it means whatever the designer of the app decides it means. Making the element look selected is a perfectly normal, non-hack aspect of what it means to be selected

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