SwiftUI Can't Remove Space Above Picker - Form Version - ios

Question

SwiftUI Can't Remove Space Above Picker - Form Version
I'm struggling mightily with the formatting of pickers in SwiftUI. I built a simple
picker with a few other views in a single view app. There is a space between the Header
and the picker that I can't remove. I'd settle for setting the gray color to white. If
I change the frame of the picker it just scrunches the picker - the gray space remains
untouched. I'm not sure what to even call that space - it does not appear to be part
of the Header, nor the Picker, nor the Form nor the Section.
The only reference to this issue that I found was article 57851878 which suggests putting
the view in the header itself. That does not work and would be a really bad idea anyway.
The space in the image outlined is red is the subject:
And this is the code:
struct ContentView: View {
#State private var thing: String = ""
#State private var enableSaveButton = false
#State private var selection = 0
#State private var selection2 = 0
var things = ["books","desks","chairs","lamps","couches","shelves"]
var body: some View {
NavigationView {
//ScrollView{
VStack {
Group {//first group
VStack {
Text("Text at the Top")
TextField("enter something here", text: $thing)
.frame(width:350, height: 50)
.clipShape(RoundedRectangle(cornerRadius: 12))
.overlay(RoundedRectangle(cornerRadius: 12)
.stroke(Color.gray, lineWidth: 2))
.padding(.leading, 5)
.padding(.bottom, 20)
Section(header: HStack {
Text("This is the Header")
.font(.headline)
.foregroundColor(.blue)
.padding(.bottom, 0)
.padding(.leading, 30)
Spacer()
}
.background(Color.white)
.listRowInsets(EdgeInsets(
top: 0,
leading: 0,
bottom: 0,
trailing: 0))
) {
Form {
Text("This is the Chosen Thing: \(self.things[selection2])")
Picker(selection: self.$selection2, label: Text("Choose Thing").foregroundColor(.blue)) {
ForEach(0 ..< things.count) {
Text(self.things[$0])
}
}//picker
}//form
.frame(width:350, height: 115)
.padding(.top, 0)
}//first picker section
}//vstack
}//first group
Spacer()
Group {//second Group
Text("Enable and Disable this button")
Button(action: {
print("whatever")
} ) {
ZStack {
RoundedRectangle(cornerRadius: 20)
.fill(Color.yellow)
.frame(width: 100, height: 40)
Text("Save").font(.headline)
}
}
.shadow(radius: 12, x: 10, y: 10)
//.disabled(!enableSaveButton)
}//second Group
}//outer VStack
//}//Scrollview
.navigationBarTitle("Things")
}//nav view
}//body
}
Any guidance would be appreciated. Xcode 11.2.1 (11B500)

Answer 1

You can remove upper and lower space of Form by adding below code
struct ContentView: View {
init() {
UITableView.appearance().tableHeaderView = UIView(frame: CGRect(x: 0, y: 0, width: 0, height: Double.leastNonzeroMagnitude))
UITableView.appearance().tableFooterView = UIView(frame: CGRect(x: 0, y: 0, width: 0, height: Double.leastNonzeroMagnitude))
}
//your code .....
}

Answer 2

Another possibility is to set the background color for the table view and table view cell to clear in init()
Init() {
UiTableView.appearance().backgroundColor = .clear
UITableViewCell.appearance().backgroundcolor = .clear
}
This will not get rid of the space, but it will make the underlying table transparent to the window background color

Answer 3

it looks like it is a section header of the form...
if you change your code like this you will see, you have a section header text. Why SwiftUI does this by itself ...i don't know....unfortunately it even does not disappear with frame set to height 0....
Form {
Section(header: Text("General Settings")){
Text("This is the Chosen Thing: \(self.things[selection2])")
}
Picker(selection: self.$selection2, label: Text("Choose Thing").foregroundColor(.blue)) {
ForEach(0 ..< things.count) {
Text(self.things[$0])
}
}//picker
}//form
.frame(width:350, height: 115)
.padding(.top, 0)