Making Button span across VStack
The best way to do this is via .frame(maxWidth: .infinity)
https://developer.apple.com/documentation/swiftui/view-layout
If you want the button not to be centered you need to specify alignment.
e.g.: .frame(maxWidth: .infinity, alignment: .leading)
Button(action: handleSignInAction) {
Text("Sign In")
}
.frame(maxWidth: .infinity)
.background(Color.green)
Old answer from 2019:
You could use a HStack with a Text and Spacer to get a Button that fills the width of its parent:
Button(action: handleSignInAction) {
HStack {
Spacer()
Text("Sign In")
Spacer()
}
}.background(Color.green)
SwiftUI: how to size to fit a Button to expand to fill a VStack or HStack parent View?
Setting .infinity as the maxWidth, the frame(minWidth: maxWidth: minHeight:) API can be used to make a subview expand to fill:
VStack(alignment: .center, spacing: 20) {
NavigationLink(destination: CustomView()) {
Text("Button")
}.frame(minWidth: 100, maxWidth: .infinity, minHeight: 44)
.background(Color.primary)
Button(action: { self.isShowingAlert = true }) {
Text("Another Button")
}.frame(minWidth: 100, maxWidth: .infinity, minHeight: 44)
.background(Color.primary)
}.frame(width: 340)
.background(Color.secondary)
Make a SwiftUI button with style .bordered expand to full width
Use this way to make a full-width button.
Button(action: {
saveUser()
}) {
Text("Save").frame(minWidth: 0, maxWidth: .infinity)
}.buttonStyle(.borderedProminent)
Image and Button title in VStack button
Here is a solution. Tested with Xcode 11.4 / iOS 13.4.
struct LightGreenButton: View {
var body: some View {
VStack {
Image(systemName: "house")
.resizable()
.frame(width: 50, height: 50, alignment: .center)
//.opacity(0.6)
.clipped()
.foregroundColor(Color(#colorLiteral(red: 0.005, green: 0.4422248602, blue: 0.3870742321, alpha: 1)))
.offset(x: 0, y: 0)
Text("Houses")
.font(.system(size: 20, weight: .semibold, design: .rounded))
.foregroundColor(Color(#colorLiteral(red: 0.005, green: 0.4422248602, blue: 0.3870742321, alpha: 1)))
}
.frame(width: 150, height: 100)
.background(
ZStack {
Color(#colorLiteral(red: 0.6574724317, green: 0.8923466802, blue: 0.8671938181, alpha: 1))
RoundedRectangle(cornerRadius: 16, style: .continuous)
.foregroundColor(.white)
.blur(radius: 4)
.offset(x: -8, y: -8)
RoundedRectangle(cornerRadius: 16, style: .continuous)
.fill(
LinearGradient(gradient: Gradient(colors: [Color(#colorLiteral(red: 0.6574724317, green: 0.8923466802, blue: 0.8671938181, alpha: 1)), Color.white]), startPoint: .topLeading, endPoint: .bottomTrailing)
)
.padding(2)
.blur(radius: 1)
})
.clipShape(RoundedRectangle(cornerRadius: 16, style: .continuous))
.shadow(color: Color(#colorLiteral(red: 0.8696053624, green: 0.8697276711, blue: 0.8695667386, alpha: 1)), radius: 20, x: 20, y: 20)
.shadow(color: Color(#colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)), radius: 20, x: -20, y: -20)
.frame(maxWidth: .infinity, maxHeight: .infinity)
.background(Color(#colorLiteral(red: 0.9447055279, green: 0.954059048, blue: 0.954059048, alpha: 1)))
.edgesIgnoringSafeArea(.all)
}
}
Make a grid of buttons of same width and height in SwiftUI
How about using a GeometryReader(docs here)? They give the dimensions of their parent view to the children. Here's a partial implementation based on what you already have:
import SwiftUI
struct ContentView : View {
var body: some View {
VStack {
Text("0")
NumpadView()
}
}
}
struct NumpadView : View {
let rows: Length = 5
let columns: Length = 4
let spacing: Length = 10
var horizontalEdges: Length {
return columns - 1
}
var verticalEdges: Length {
return rows - 1
}
func getItemWidth(containerWidth: Length) -> Length {
return (containerWidth - spacing * horizontalEdges) / columns
}
func getItemHeight(containerHeight: Length) -> Length {
return (containerHeight - spacing * verticalEdges) / rows
}
var body: some View {
GeometryReader { geometry in
VStack(alignment: .center, spacing: self.spacing) {
HStack(alignment: .center, spacing: self.spacing) {
Button(action: {}) {
Text("7")
.frame(width: self.getItemWidth(containerWidth: geometry.size.width), height: self.getItemHeight(containerHeight: geometry.size.height))
.background(Color.green)
}
Button(action: {}) {
Text("8")
.frame(width: self.getItemWidth(containerWidth: geometry.size.width), height: self.getItemHeight(containerHeight: geometry.size.height))
.background(Color.yellow)
}
Button(action: {}) {
Text("9")
.frame(width: self.getItemWidth(containerWidth: geometry.size.width), height: self.getItemHeight(containerHeight: geometry.size.height))
.background(Color.green)
}
}
HStack(alignment: .center, spacing: self.spacing) {
Button(action: {}) {
Text("4")
.frame(width: self.getItemWidth(containerWidth: geometry.size.width), height: self.getItemHeight(containerHeight: geometry.size.height))
.background(Color.yellow)
}
Button(action: {}) {
Text("5")
.frame(width: self.getItemWidth(containerWidth: geometry.size.width), height: self.getItemHeight(containerHeight: geometry.size.height))
.background(Color.green)
}
Button(action: {}) {
Text("6")
.frame(width: self.getItemWidth(containerWidth: geometry.size.width), height: self.getItemHeight(containerHeight: geometry.size.height))
.background(Color.yellow)
}
}
HStack(alignment: .center, spacing: self.spacing) {
Button(action: {}) {
Text("1")
.frame(width: self.getItemWidth(containerWidth: geometry.size.width), height: self.getItemHeight(containerHeight: geometry.size.height))
.background(Color.green)
}
Button(action: {}) {
Text("2")
.frame(width: self.getItemWidth(containerWidth: geometry.size.width), height: self.getItemHeight(containerHeight: geometry.size.height))
.background(Color.yellow)
}
Button(action: {}) {
Text("3")
.frame(width: self.getItemWidth(containerWidth: geometry.size.width), height: self.getItemHeight(containerHeight: geometry.size.height))
.background(Color.green)
}
}
HStack(alignment: .center, spacing: self.spacing) {
Button(action: {}) {
Text("0")
.frame(width: self.getItemWidth(containerWidth: geometry.size.width) * 2 + self.spacing, height: self.getItemHeight(containerHeight: geometry.size.height))
.background(Color.yellow)
}
Button(action: {}) {
Text(".")
.frame(width: self.getItemWidth(containerWidth: geometry.size.width), height: self.getItemHeight(containerHeight: geometry.size.height))
.background(Color.yellow)
}
}
}.frame(maxWidth: .infinity, maxHeight: .infinity)
}
}
}
#if DEBUG
struct ContentView_Previews : PreviewProvider {
static var previews: some View {
ContentView()
}
}
#endif
Looks like this: 
SwiftUI: buttons inside a HStack cause the overall HStack to exceed the bounds
Your fixedSize() was making it draw the HStack outside of it's bounds. You want the Texts to fill the available space, then SwiftUI will try to break on the words. If the container is too small it will break within the words so you need to be aware of this, 260 is about the smallest it can go with this font size.
Here's what I came up with, modified to be runnable with an SF symbol. You need some padding in between texts otherwise they will be right up against each other at some sizes of the container.
struct TransferDetailsButtonsView: View {
enum ButtonType: Hashable {
case share
case download
case delete
fileprivate var imageName: String {
switch self {
case .share:
return "square.and.arrow.up.fill"
case .download:
return "square.and.arrow.up.fill"
case .delete:
return "square.and.arrow.up.fill"
}
}
fileprivate var title: String {
switch self {
case .share:
return "Share"
case .download:
return "Download all"
case .delete:
return "Delete it now"
}
}
}
/// The button types you want to show
var buttonTypes: [ButtonType] = [.share, .download, .delete]
/// The action for the buttons
var action: (ButtonType) -> Void = { _ in }
var body: some View {
HStack(alignment: .top, spacing: 0) {
ForEach(buttonTypes, id: \.self) { button in
Button {
action(button)
} label: {
VStack(spacing: 8) {
Image(systemName: button.imageName)
Text(button.title)
.frame(maxWidth: .infinity)
}
}
.padding(.horizontal, 4)
}
}
.padding(.vertical, 12)
.foregroundColor(.white)
.background(RoundedRectangle(cornerRadius: 16).fill(.blue))
}
}
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