Accessing Existing Button with Tag?

Question

Created Dec ’20

Replies 4

Boosts 0

Participants 2

I have a button (Click me) at the top. And it's followed by some space and stacks of buttons that are horizontally laid out as follows.

Code Block import SwiftUI
struct ContentView: View {
    var body: some View {
        ZStack {
            VStack(spacing: 0.0) {
                Button("Click me", action: {
                                        
                })
                Spacer()
                    .frame(height: 20)
                
                HStack(spacing: 0.0) {
                    ForEach((0...6), id: \.self) {
                        Button("") {
                            
                        }
                        .tag($0)
                        .buttonStyle(BorderlessButtonStyle())
                        .frame(width: 48, height: 48, alignment: .center)
                        .background(RoundedRectangle(cornerRadius: 2)
                                        .fill(Color.white)
                                        .shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
                        )
                    }
                }
                ...
                ...
                ...
                HStack(spacing: 0.0) {
                    ForEach((28...34), id: \.self) {
                        Button("") {
                            
                        }
                        .tag($0)
                        .buttonStyle(BorderlessButtonStyle())
                        .frame(width: 48, height: 48, alignment: .center)
                        .background(RoundedRectangle(cornerRadius: 2)
                                        .fill(Color.white)
                                        .shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
                        )
                    }
                }
                HStack(alignment: .top, spacing: 0.0) {
                    ForEach((35...36), id: \.self) {
                        Button("") {
                            
                        }
                        .tag($0)
                        .buttonStyle(BorderlessButtonStyle())
                        .frame(width: 48, height: 48, alignment: .center)
                        .background(RoundedRectangle(cornerRadius: 2)
                                        .fill(Color.white)
                                        .shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
                        )
                    }
                }
                .frame(width: 336.0, height: 48.0, alignment: .leading)
            }
        }
    }
}

None of the buttons except the very top one has a title as you see above. And I want to set a title to each button and show or hide any of them when necessary. So is it possible for me to access any of the buttons with its tag and set its title and show or hide it? Thank you.

Answered by OOPer in 652272022

how it could be done without the tag

For example, I would write something like this:

Code Block import SwiftUI
struct ContentView: View {
    @State var buttonTitles: [String?] = Array(repeating: nil, count: 37) //<- Change `count` as the number you need
    
    var body: some View {
        ZStack {
            VStack(spacing: 0.0) {
                Button("Click me", action: {
                                        
                })
                Spacer()
                    .frame(height: 20)
                
                HStack(spacing: 0.0) {
                    ForEach((0...6), id: \.self) {
                        Button(buttonTitles[$0] ?? "") { //<-
                            
                        }
                        .tag($0)
                        .buttonStyle(BorderlessButtonStyle())
                        .frame(width: 48, height: 48, alignment: .center)
                        .background(RoundedRectangle(cornerRadius: 2)
                                        .fill(Color.white)
                                        .shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
                        )
                    }
                }
                //...
                //...
                //...
                HStack(spacing: 0.0) {
                    ForEach((28...34), id: \.self) {
                        Button(buttonTitles[$0] ?? "") { //<-
                            
                        }
                        .tag($0)
                        .buttonStyle(BorderlessButtonStyle())
                        .frame(width: 48, height: 48, alignment: .center)
                        .background(RoundedRectangle(cornerRadius: 2)
                                        .fill(Color.white)
                                        .shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
                        )
                    }
                }
                HStack(alignment: .top, spacing: 0.0) {
                    ForEach((35...36), id: \.self) {
                        Button(buttonTitles[$0] ?? "") { //<-
                            
                        }
                        .tag($0)
                        .buttonStyle(BorderlessButtonStyle())
                        .frame(width: 48, height: 48, alignment: .center)
                        .background(RoundedRectangle(cornerRadius: 2)
                                        .fill(Color.white)
                                        .shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
                        )
                    }
                }
                .frame(width: 336.0, height: 48.0, alignment: .leading)
            }
        }
    }
}

Generally in SwiftUI, you should not try to modify the view content by touching each view, but you should define a source of truth for the views and modify the source.

Boost

Answer 1

OOPer OP

Dec ’20

it possible for me to access any of the buttons with its tag

Sorry, I have never tried and I do not know.

is it possible for me to set its title and show or hide it?

If you do not insist on using tags, the answer would be YES.

0

Answer 2

Tomato OP

Dec ’20

Thanks, OOper. No, I don't insist on using tags. Could you give me some idea of how it could be done without the tag, please?

0

Answer 3

OOPer OP

Dec ’20

Accepted Answer

how it could be done without the tag

For example, I would write something like this:

Code Block import SwiftUI
struct ContentView: View {
    @State var buttonTitles: [String?] = Array(repeating: nil, count: 37) //<- Change `count` as the number you need
    
    var body: some View {
        ZStack {
            VStack(spacing: 0.0) {
                Button("Click me", action: {
                                        
                })
                Spacer()
                    .frame(height: 20)
                
                HStack(spacing: 0.0) {
                    ForEach((0...6), id: \.self) {
                        Button(buttonTitles[$0] ?? "") { //<-
                            
                        }
                        .tag($0)
                        .buttonStyle(BorderlessButtonStyle())
                        .frame(width: 48, height: 48, alignment: .center)
                        .background(RoundedRectangle(cornerRadius: 2)
                                        .fill(Color.white)
                                        .shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
                        )
                    }
                }
                //...
                //...
                //...
                HStack(spacing: 0.0) {
                    ForEach((28...34), id: \.self) {
                        Button(buttonTitles[$0] ?? "") { //<-
                            
                        }
                        .tag($0)
                        .buttonStyle(BorderlessButtonStyle())
                        .frame(width: 48, height: 48, alignment: .center)
                        .background(RoundedRectangle(cornerRadius: 2)
                                        .fill(Color.white)
                                        .shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
                        )
                    }
                }
                HStack(alignment: .top, spacing: 0.0) {
                    ForEach((35...36), id: \.self) {
                        Button(buttonTitles[$0] ?? "") { //<-
                            
                        }
                        .tag($0)
                        .buttonStyle(BorderlessButtonStyle())
                        .frame(width: 48, height: 48, alignment: .center)
                        .background(RoundedRectangle(cornerRadius: 2)
                                        .fill(Color.white)
                                        .shadow(color: Color.black.opacity(0.4), radius: 2, x: 0, y: 0)
                        )
                    }
                }
                .frame(width: 336.0, height: 48.0, alignment: .leading)
            }
        }
    }
}

Generally in SwiftUI, you should not try to modify the view content by touching each view, but you should define a source of truth for the views and modify the source.

1

Answer 4

Tomato OP

Dec ’20

That's interesting. Thanks, OOper. I have to take a close look at what you have done.

0