SwiftUI Content View random padding - ios

Question

I am currently creating a content view for my application and am experiencing some strange behavior with padding. As seen in the photo below, there is quite a bit of space below the navigation bar at the top of the phone. I don't specify any padding here so I'm wondering why there is so much space between the top and where the image is displayed. The image doesn't have that large of a white box around it either.
My code does not specify any kind of margin or padding. I'm new to Swift and SwiftUI so I'm curious if there is some automatic padding applied to navigation views?
import Kingfisher
struct BottleView: View {
let bottle: Bottle
var body: some View {
VStack {
KFImage(URL(string: bottle.image ?? "")!)
.resizable()
.frame(width: 128, height: 256)
VStack(alignment: .leading) {
HStack {
Text(bottle.name)
.font(.title)
Spacer()
Text("Price")
}
HStack {
Text(bottle.varietal ?? "")
Spacer()
Text("$\(bottle.price ?? "")")
}
.font(.subheadline)
.foregroundColor(.secondary)
VStack(alignment: .leading) {
Text("Information")
.font(.title2)
Text(bottle.information ?? "")
}
}
}
}
}

Answer 1

If you apply a .background(Color.red) to the VStack, you'll see that it's centered in the screen.
var body: some View {
VStack {
Image("TestImage")
.resizable()
.frame(width: 128, height: 256)
/// ... more code
}
.background(Color.red)
}
This is because, by default, most SwiftUI views are centered. For example, try just a Text:
struct ContentView: View {
var body: some View {
Text("Hello, I'm centered!")
}
}
So if you don't want it centered, this is where Spacers come in. These expand to fill all available space, pushing all other views. Here's the code that gets rid of the "bit of space below the navigation bar at the top of the phone":
(note that I replaced your Bottle properties with static text, make sure you change them back)
struct BottleView: View {
// let bottle: Bottle
var body: some View {
VStack {
Image("TestImage")
.resizable()
.frame(width: 128, height: 256)
VStack(alignment: .leading) {
HStack {
Text("Blantons")
.font(.title)
Spacer()
Text("Price")
}
HStack {
Text("Bourbon")
Spacer()
Text("$59.99")
}
.font(.subheadline)
.foregroundColor(.secondary)
VStack(alignment: .leading) {
Text("Information")
.font(.title2)
Text("Product info here")
}
}
Spacer() /// spacer right here! pushes the other views up
}
.background(Color.red)
.navigationBarTitleDisplayMode(.inline) /// get rid of the additional top gap that the default Large Title navigation bar produces
}
}
Result: