How to put View on top of all other views in SwiftUI - swift

Question

I'm developing SwiftUI test app and I added my custom DropDown menu here.
All works fine except dropdown menu is below other views. So users can't see & click dropdown menu correctly.
Here's my dropdown menu.
import SwiftUI
var dropdownCornerRadius:CGFloat = 3.0
struct DropdownOption: Hashable {
public static func == (lhs: DropdownOption, rhs: DropdownOption) -> Bool {
return lhs.key == rhs.key
}
var key: String
var val: String
}
struct DropdownOptionElement: View {
var dropdownWidth:CGFloat = 150
var val: String
var key: String
#Binding var selectedKey: String
#Binding var shouldShowDropdown: Bool
#Binding var displayText: String
var body: some View {
Button(action: {
self.shouldShowDropdown = false
self.displayText = self.val
self.selectedKey = self.key
}) {
VStack {
Text(self.val)
Divider()
}
}.frame(width: dropdownWidth, height: 30)
.padding(.top, 15).background(Color.gray)
}
}
struct Dropdown: View {
var dropdownWidth:CGFloat = 150
var options: [DropdownOption]
#Binding var selectedKey: String
#Binding var shouldShowDropdown: Bool
#Binding var displayText: String
var body: some View {
VStack(alignment: .leading, spacing: 0) {
ForEach(self.options, id: \.self) { option in
DropdownOptionElement(dropdownWidth: self.dropdownWidth, val: option.val, key: option.key, selectedKey: self.$selectedKey, shouldShowDropdown: self.$shouldShowDropdown, displayText: self.$displayText)
}
}
.background(Color.white)
.cornerRadius(dropdownCornerRadius)
.overlay(
RoundedRectangle(cornerRadius: dropdownCornerRadius)
.stroke(Color.primary, lineWidth: 1)
)
}
}
struct DropdownButton: View {
var dropdownWidth:CGFloat = 300
#State var shouldShowDropdown = false
#State var displayText: String
#Binding var selectedKey: String
var options: [DropdownOption]
let buttonHeight: CGFloat = 30
var body: some View {
Button(action: {
self.shouldShowDropdown.toggle()
}) {
HStack {
Text(displayText)
Spacer()
Image(systemName: self.shouldShowDropdown ? "chevron.up" : "chevron.down")
}
}
.padding(.horizontal)
.cornerRadius(dropdownCornerRadius)
.frame(width: self.dropdownWidth, height: self.buttonHeight)
.overlay(
RoundedRectangle(cornerRadius: dropdownCornerRadius)
.stroke(Color.primary, lineWidth: 1)
)
.overlay(
VStack {
if self.shouldShowDropdown {
Spacer(minLength: buttonHeight)
Dropdown(dropdownWidth: dropdownWidth, options: self.options, selectedKey: self.$selectedKey, shouldShowDropdown: $shouldShowDropdown, displayText: $displayText)
}
}, alignment: .topLeading
)
.background(
RoundedRectangle(cornerRadius: dropdownCornerRadius).fill(Color.white)
)
}
}
struct DropdownButton_Previews: PreviewProvider {
static let options = [
DropdownOption(key: "week", val: "This week"), DropdownOption(key: "month", val: "This month"), DropdownOption(key: "year", val: "This year")
]
static var previews: some View {
Group {
VStack(alignment: .leading) {
DropdownButton(displayText: "This month", selectedKey: .constant("Test"), options: options)
}
.frame(maxWidth: .infinity, maxHeight: .infinity)
.background(Color.green)
.foregroundColor(Color.primary)
VStack(alignment: .leading) {
DropdownButton(shouldShowDropdown: true, displayText: "This month", selectedKey: .constant("Test"), options: options)
}
.frame(maxWidth: .infinity, maxHeight: .infinity)
.background(Color.green)
.foregroundColor(Color.primary)
}
}
}
Here's how it looks like.
Has anyone faced this issue before? And Could anyone please help me solve this issue?
Thanks.

Answer 1

Try to put everything in ZStack and use zIndex for DropdownButton to put it atop, like
ZStack {
// ... other content here
DropdownButton(displayText: "This month",
selectedKey: .constant("Test"),
options: options).zIndex(10)
// ... other content here