'Center View horizontally in SwiftUI
How can I center horizontally a View
(Image
) in an HStack
? I want a button to be left aligned and the image to be centered horizontally the view.
Currently I have this structure:
VStack {
HStack {
Button(action: {
print("Tapped")
}, label: {
Image("left-arrow")
.resizable()
.frame(width: 30, height: 30, alignment: .leading)
}).padding(.leading, 20)
Spacer()
Image("twitter-logo")
.resizable()
.frame(width: 30, height: 30, alignment: .center)
}
Spacer()
}
Which is giving me this:
But I want to achieve this:
Solution 1:[1]
What's about saving button size to a property and add a negative padding to the image? And pay attention to an additional spacer after the image.
struct ContentView: View {
var buttonSize: Length = 30
var body: some View {
VStack {
HStack {
Button(action: {
print("Tapped")
}, label: {
Image(systemName: "star")
.resizable()
.frame(width: buttonSize, height: buttonSize, alignment: .leading)
})
Spacer()
Image(systemName: "star")
.resizable()
.frame(width: 30, height: 30, alignment: .center)
.padding(.leading, -buttonSize)
Spacer()
}
Spacer()
}
}
}
The result:
Solution 2:[2]
You can embed two HStack
's in a ZStack
and place spacers accordingly for the horizontal spacing. Embed all that in a VStack
with a Spacer()
to have everything pushed up to the top.
struct ContentView : View {
var buttonSize: Length = 30
var body: some View {
VStack {
ZStack {
HStack {
Button(action: {
}, label: {
Image(systemName: "star")
.resizable()
.frame(width: CGFloat(30), height: CGFloat(30), alignment: .leading)
}).padding(.leading, CGFloat(20))
Spacer()
}
HStack {
Image(systemName: "star")
.resizable()
.frame(width: CGFloat(30), height: CGFloat(30), alignment: .center)
}
}
Spacer()
}
}
}
Note: In the second HStack
, the image should automatically be center aligned, but if it isn't, you can place a Spacer()
before and after the image.
Edit: Added the VStack
and Spacer()
to move everything to the top like the OP wanted.
Edit 2: Removed padding on image because it caused the image to be slightly offset from the center. Since it is in its own HStack
and center-aligned, it does not need padding.
Edit 3: Thanks to @Chris Prince in the comments, I decided to make a simple NavigationBar-esque custom view that you can provide left, center, and right arguments to create the effect that the OP desired (where each set of views are aligned independently of each other):
struct CustomNavBar<Left, Center, Right>: View where Left: View, Center: View, Right: View {
let left: () -> Left
let center: () -> Center
let right: () -> Right
init(@ViewBuilder left: @escaping () -> Left, @ViewBuilder center: @escaping () -> Center, @ViewBuilder right: @escaping () -> Right) {
self.left = left
self.center = center
self.right = right
}
var body: some View {
ZStack {
HStack {
left()
Spacer()
}
center()
HStack {
Spacer()
right()
}
}
}
}
Usage:
struct ContentView: View {
let buttonSize: CGFloat = 30
var body: some View {
VStack {
CustomNavBar(left: {
Button(action: {
print("Tapped")
}, label: {
Image(systemName: "star")
.resizable()
.frame(width: self.buttonSize, height: self.buttonSize, alignment: .leading)
}).padding()
}, center: {
Image(systemName: "star")
.resizable()
.frame(width: 30, height: 30, alignment: .center)
}, right: {
HStack {
Text("Long text here")
Image(systemName: "star")
.resizable()
.frame(width: 30, height: 30, alignment: .center)
.padding(.trailing)
}.foregroundColor(.red)
})
Spacer()
Text("Normal Content")
Spacer()
}
}
}
Solution 3:[3]
Easiest way for me:
ZStack(){
HStack{
Image("star").resizable().foregroundColor(.white).frame(width: 50, height: 50)
Spacer()
}
Image("star").resizable().font(.title).foregroundColor(.white).frame(width: 50, height: 50)
}
Solution 4:[4]
You center the view using position property try this code
Group{ // container View
Image("twitter-logo")
.resizable()
.frame(width: 30, height: 30, alignment: .center)
}.position(x: UIScreen.main.bounds.width/2)
Solution 5:[5]
the right way to center the Title like navigationbar:
HStack {
Spacer()
.overlay {
HStack {
Image(systemName: "star")
Spacer()
}
}
Text("Title")
Spacer()
.overlay {
HStack {
Spacer()
Image(systemName: "star")
}
}
}
Solution 6:[6]
I have got an alternative solution. I used a hidden Image as placeholder.
HStack {
Image("left-arrow").padding()
Spacer()
Image("twitter-logo")
Spacer()
// placeholder to keep layout symmetric
Image("left-arrow").padding().hidden()
}
Of course you can replace the Images with Buttons or other Views as you prefer.
Solution 7:[7]
Let me propose a different solution:
https://gist.github.com/buscarini/122516641cd0ee275dd367786ff2a736
It can be used like this:
HStack {
Color.red
.frame(width: 0, height: 50)
.layoutPriority(1)
GlobalHCenteringView {
Text("Hello, world!")
.lineLimit(1)
.background(Color.green)
}
.background(Color.yellow)
Color.red
.frame(width: 180, height: 50)
.layoutPriority(1)
}
}
This will center the child view in the screen if it fits, or leave it as is if it doesn't. It is currently using UIScreen, so it only works on iOS, but you could easily pass the screen or parent width to the constructor of the view, getting it from a GeometryReader or whatever.
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
Solution | Source |
---|---|
Solution 1 | Artem Novichkov |
Solution 2 | pawello2222 |
Solution 3 | DaWiseguy |
Solution 4 | kishor soneji |
Solution 5 | user3172189 |
Solution 6 | Laufwunder |
Solution 7 | José Manuel Sánchez |