Right-justified offset alignment of overlays using GeometryReader - swiftui

I am trying to right-align several overlays but am unable to figure out how to do this.
What I have here is a VStack of 2 images on the right side of the screen, and I want to display an overlay text label for each image, to the left of the image, but right-aligned with the other labels, like so:
A LABEL A
ANOTHER LABEL B
The code below displays the labels center aligned, like so:
A LABEL A
ANOTHER LABEL B
struct TestOverlayOffset : View {
var body : some View {
HStack {
Spacer()
VStack(spacing: 32) {
Spacer()
Image(systemName: "a.circle").font(.title)
.overlay(labelOnTheLeft("A LABEL"))
Image(systemName: "b.circle").font(.title)
.overlay(labelOnTheLeft("ANOTHER LABEL"))
Spacer()
}
.background(Color.gray)
}
.background(Color.green)
}
func labelOnTheLeft(_ text: String) -> some View {
GeometryReader { proxy in
Text(text)
.fixedSize()
.foregroundColor(.black)
.background(Color.yellow)
.offset(x: -128 - proxy.size.width/2)
}
}
}

Here is possible solution (with smallest changes and removed hardcoding).
Tested with Xcode 12.1 / iOS 14.1
func labelOnTheLeft(_ text: String) -> some View {
GeometryReader { proxy in
Text(text)
.fixedSize()
.foregroundColor(.black)
.background(Color.yellow)
.padding(.trailing)
.offset(x: -proxy.size.width)
.frame(width: proxy.size.width, alignment: .trailing)
}
}

Related

SwiftUI - making view within VStack fill available space in ScrollView

I have a view where the basic structure is as follows (this is just a bare representation of my actual view obviously):
var body: some View {
NavigationView {
VStack {
// Logo and postcode search
VStack {
Text("Logo")
.background(Color.red)
Text("Title")
.background(Color.blue)
}
.fixedSize(horizontal: false, vertical: true)
.padding()
ScrollView(.vertical, showsIndicators: false) {
VStack(alignment: .leading) {
Text("Selector")
.background(Color.yellow)
Text("Browse")
.frame(maxHeight: .infinity)
.background(Color.green)
}
.navigationBarHidden(true)
}
}
.background(Color.red)
}
}
What I am trying to do is have the "Browse" section fill all the available space from its starting position to the bottom of the screen. However, here is how it currently looks:
If I set a concrete height to the 'browse' text (e.g. frame(height: 400)) it increases the height accordingly. However, given that the view is within the scroll view which we can see in turn is the full height of the screen, I thought that setting the maxHeight property to .infinity would have the desired effect, but clearly not. What am I doing wrong here?
We need to calculate that manually, because ScrollView requires finite intrinsic content size.
Here is a possible approach. Tested with Xcode 13.4 / iOS 15.5
GeometryReader { gp in
ScrollView(.vertical, showsIndicators: false) {
VStack(alignment: .leading) {
Text("Selector")
.background(Color.yellow)
Text("Browse")
.frame(minHeight: height, alignment: .top)
.background(GeometryReader {
Color.clear.preference(key: ViewOffsetKey.self,
value: $0.frame(in: .named("parent")).origin.y)
})
.background(Color.green)
}
.navigationBarHidden(true)
}
.coordinateSpace(name: "parent")
.onPreferenceChange(ViewOffsetKey.self) {
height = gp.size.height - $0
}
.frame(maxWidth: .infinity)
}
Complete code in project

SwiftUI, remove space between views in a VStack?

Why is there so much space between the three blue rectangles and the list? How can I remove the space so that all views within the VStack stack at the top? I tried using a Spacer() directly after the List, but nothing changed.
struct ContentView: View {
init() { UITableView.appearance().backgroundColor = UIColor.clear }
var body: some View {
NavigationView {
ZStack {
Color.red
.ignoresSafeArea()
VStack {
HStack {
Text("Faux Title")
.font(.system(.largeTitle, design: .rounded))
.fontWeight(.heavy)
Spacer()
Button(action: {
// settings
}, label: {
Image(systemName: "gearshape.fill")
.font(.system(.title2))
})
}
.padding()
GeometryReader { geometry in
HStack() {
Text("1")
.frame(width: geometry.size.width * 0.30, height: 150)
.background(Color.blue)
Spacer()
Text("2")
.frame(width: geometry.size.width * 0.30, height: 150)
.background(Color.blue)
Spacer()
Text("3")
.frame(width: geometry.size.width * 0.30, height: 150)
.background(Color.blue)
}
}
.padding()
List {
Text("One")
Text("Two")
Text("Three")
Text("Four")
Text("Five")
Text("Six")
}
.listStyle(InsetGroupedListStyle())
}
}
.navigationBarHidden(true)
}
}
}
Bonus question: In web development, you can open your browser's Web Inspector and use the element selector to click on elements which highlights their borders. Useful for something like this where you're trying to figure out which element the offending spacing belongs to. Is there something like that in Xcode?
VStack(spacing: 0) {...}
Spacer()
to your question you can in Xcode use the view inspector. https://developer.apple.com/library/archive/documentation/ToolsLanguages/Conceptual/Xcode_Overview/ExaminingtheViewHierarchy.html
Since you know that your HStack with the blue rectangles is going to be a height of 150, you should constrain it to that using .frame(height: 150):
GeometryReader { geometry in
...
}
.padding()
.frame(height: 150) //Here
Otherwise, the GeometryReader will occupy all available vertical space.
Re: your web dev comparison, check out the Xcode view hierarchy inspector. It's not exactly the same, but it's in the same vein: https://developer.apple.com/library/archive/documentation/ToolsLanguages/Conceptual/Xcode_Overview/ExaminingtheViewHierarchy.html

Why the frame of an SF Symbol isn't encompassing its entire image?

When I put an image on screen, I expect the image to be entirely enclosed in its own frame, but apparently I am wrong. Does anyone know why? Thanks.
My Code:
struct ContentView: View {
var body: some View {
HStack {
Group {
Image(systemName: "envelope.badge.fill")
Image(systemName: "moon.stars.fill")
} // Group
.foregroundColor(.yellow)
.font(.system(size: 128))
.border(Color.red)
} // VStack
.padding(40)
.background(Color.white)
}
}
Result:
This appears to be a bug that is now fixed in SwiftUI 2.0 (Xcode 12).
Here is a workaround for SwiftUI 1.0 (Xcode 11). It uses UIImage(systemName:) to get the actual dimensions of the image, and then uses .aspectRatio(_:contentMode:) to set the correct aspect ratio.
struct SystemImage: View {
let name: String
var body: some View {
let uiImage = UIImage(systemName: name)!
return Image(systemName: name)
.resizable()
.aspectRatio(uiImage.size, contentMode: .fit)
}
}
struct ContentView: View {
var body: some View {
HStack {
Group {
SystemImage(name: "envelope.badge.fill")
SystemImage(name: "moon.stars.fill")
} // Group
.foregroundColor(.yellow)
.font(.system(size: 128))
.border(Color.red)
} // VStack
.padding(40)
.background(Color.white)
}
}
Try placing the padding before the border.
edit...
Does this help:
HStack {
Group {
Image(systemName: "envelope.badge.fill")
Image(systemName: "moon.stars.fill")
} // Group
.foregroundColor(.yellow)
.font(.system(size: 128))
.frame(width:150, height: 150, alignment: .center)
.padding(10)
.border(Color.red)
} // VStack
.padding(40)
.background(Color.white)

how to strech image on one side in swiftUI, like a .9 file in Android?

i have an image that i want to strech only it's height to fit different content, how do i do that in swiftUI? right now it looks like this
struct ContentView: View {
var body: some View {
VStack {
HStack {
VStack(alignment: .leading, spacing: 130) {
Text("Title")
.font(.headline)
.foregroundColor(.primary)
Text("text")
.font(.subheadline)
.foregroundColor(.secondary)
Text("padding")
}
.padding(.vertical)
Spacer()
Image("rightTag")
.resizable(capInsets: .init(top: 0, leading: 0, bottom: 0, trailing: 0), resizingMode: .stretch)
.aspectRatio(contentMode: .fit)
.frame(maxWidth: 20)
}
.frame(maxWidth: screen.width - 60)
.padding(.leading)
.background(.white)
.cornerRadius(20)
}
}
}
how can i stretch its height to fit this outer frame? ragular resizable and stuff can't get it done.
any helped would be wonderful! Thanks!
sry i didn't make myself clear earllier.
Here is possible approach. However as I see now you'd rather need to stretch not the entire original image, but only middle of it, so in real project it would be needed to make your image tri-part and apply below stretching approach only to middle (square) part.
Approach uses asynchronous state update, so works in Live Preview / Simulator / RealDevice. (Tested with Xcode 11.2 / iOS 13.2)
struct ContentView: View {
#State private var textHeigh: CGFloat = .zero
var body: some View {
VStack {
HStack(alignment: .top) {
VStack(alignment: .leading, spacing: 130) {
Text("Title")
.font(.headline)
.foregroundColor(.primary)
Text("text")
.font(.subheadline)
.foregroundColor(.secondary)
Text("padding")
}
.padding(.vertical)
.alignmentGuide(.top, computeValue: { d in
DispatchQueue.main.async {
self.textHeigh = d.height // !! detectable height of left side text
}
return d[.top]
})
Spacer()
Image("rightTag")
.resizable()
.frame(maxWidth: 20, maxHeight: max(60, textHeigh)) // 60 just for default
}
.frame(maxWidth: screen.width - 60)
.padding(.leading)
.background(Color.white)
}
}
}

SwiftUI Button tap only on text portion

The background area of my button is not detecting user interaction. Only way to interact with said button is to tap on the Text/ Label area of the button. How to make entire Button tappable?
struct ScheduleEditorButtonSwiftUIView: View {
#Binding var buttonTagForAction : ScheduleButtonType
#Binding var buttonTitle : String
#Binding var buttonBackgroundColor : Color
let buttonCornerRadius = CGFloat(12)
var body: some View {
Button(buttonTitle) {
buttonActionForTag(self.buttonTagForAction)
}.frame(minWidth: (UIScreen.main.bounds.size.width / 2) - 25, maxWidth: .infinity, minHeight: 44)
.buttonStyle(DefaultButtonStyle())
.lineLimit(2)
.multilineTextAlignment(.center)
.font(Font.subheadline.weight(.bold))
.foregroundColor(Color.white)
.border(Color("AppHighlightedColour"), width: 2)
.background(buttonBackgroundColor).opacity(0.8)
.tag(self.buttonTagForAction)
.padding([.leading,.trailing], 5)
.cornerRadius(buttonCornerRadius)
}
}
The proper solution is to use the .contentShape() API.
Button(action: action) {
HStack {
Spacer()
Text("My button")
Spacer()
}
}
.contentShape(Rectangle())
You can change the provided shape to match the shape of your button; if your button is a RoundedRectangle, you can provide that instead.
I think this is a better solution, add the .frame values to the Text() and the button will cover the whole area 😉
Button(action: {
//code
}) {
Text("Click Me")
.frame(minWidth: 100, maxWidth: .infinity, minHeight: 44, maxHeight: 44, alignment: .center)
.foregroundColor(Color.white)
.background(Color.accentColor)
.cornerRadius(7)
}
You can define content Shape for hit testing by adding modifier: contentShape(_:eoFill:)
And important thing is you have to apply inside the content of Button.
Button(action: {}) {
Text("Select file")
.frame(width: 300)
.padding(100.0)
.foregroundColor(Color.black)
.contentShape(Rectangle()) // Add this line
}
.background(Color.green)
.cornerRadius(4)
.buttonStyle(PlainButtonStyle())
Another
Button(action: {}) {
VStack {
Text("Select file")
.frame(width: 100)
Text("Select file")
.frame(width: 200)
}
.contentShape(Rectangle()) // Add this inside Button.
}
.background(Color.green)
.cornerRadius(4)
.buttonStyle(PlainButtonStyle())
This fixes the issue on my end:
var body: some View {
GeometryReader { geometry in
Button(action: {
// Action
}) {
Text("Button Title")
.frame(
minWidth: (geometry.size.width / 2) - 25,
maxWidth: .infinity, minHeight: 44
)
.font(Font.subheadline.weight(.bold))
.background(Color.yellow).opacity(0.8)
.foregroundColor(Color.white)
.cornerRadius(12)
}
.lineLimit(2)
.multilineTextAlignment(.center)
.padding([.leading,.trailing], 5)
}
}
Is there a reason why you are using UIScreen instead of GeometryReader?
Short Answer
Make sure the Text (or button content) spans the length of the touch area, AND use .contentShape(Rectangle()).
Button(action:{}) {
HStack {
Text("Hello")
Spacer()
}
.contentShape(Rectangle())
}
Long Answer
There are two parts:
The content (ex. Text) of the Button needs to be stretched
The content needs to be considered for hit testing
To stretch the content (ex. Text):
// Solution 1 for stretching content
HStack {
Text("Hello")
Spacer()
}
// Solution 2 for stretching content
Text("Hello")
.frame(maxWidth: .infinity, alignment: .leading)
// Alternatively, you could specify a specific frame for the button.
To consider content for hit testing use .contentShape(Rectangle()):
// Solution 1
Button(action:{}) {
HStack {
Text("Hello")
Spacer()
}
.contentShape(Rectangle())
}
// Solution 2
Button(action:{}) {
Text("Hello")
.frame(maxWidth: .infinity, alignment: .leading)
.contentShape(Rectangle())
}
You might be doing this:
Button { /*to do something on button click*/}
label: { Text("button text").foregroundColor(Color.white)}
.frame(width: 45, height: 45, alignment: .center)
.background(Color.black)
Solution:
Button(action: {/*to do something on button click*/ })
{
HStack {
Spacer()
Text("Buttton Text")
Spacer() } }
.frame(width: 45, height: 45, alignment: .center)
.foregroundColor(Color.white)
.background(Color.black).contentShape(Rectangle())
A bit late to the answer, but I found two ways to do this —
Option 1: Using Geometry Reader
Button(action: {
}) {
GeometryReader { geometryProxy in
Text("Button Title")
.font(Font.custom("SFProDisplay-Semibold", size: 19))
.foregroundColor(Color.white)
.frame(width: geometryProxy.size.width - 20 * 2) // horizontal margin
.padding([.top, .bottom], 10) // vertical padding
.background(Color.yellow)
.cornerRadius(6)
}
}
Option 2: Using HStack with Spacers
HStack {
Spacer(minLength: 20) // horizontal margin
Button(action: {
}) {
Text("Hello World")
.font(Font.custom("SFProDisplay-Semibold", size: 19))
.frame(maxWidth:.infinity)
.padding([.top, .bottom], 10) // vertical padding
.background(Color.yellow)
.foregroundColor(Color.white)
.cornerRadius(6)
}
Spacer(minLength: 20)
}.frame(maxWidth:.infinity)
My thought process here is that although option 1 is more succinct, I would choose option 2 since it's less coupled to its parent's size (through GeometryReader) and more in line of how I think SwiftUI is meant to use HStack, VStack, etc.
I was working with buttons and texts that need user interaction when I faced this same issue. After looking and testing many answers (including some from this post) I ended up making it works in the following way:
For buttons:
/* WITH IMAGE */
Button {
print("TAppeD")
} label: {
Image(systemName: "plus")
.frame(width: 40, height: 40)
}
/* WITH TEXT */
Button {
print("TAppeD")
} label: {
Text("My button")
.frame(height: 80)
}
For Texts:
Text("PP")
.frame(width: 40, height: 40)
.contentShape(Rectangle())
.onTapGesture {
print("TAppeD")
}
In the case of the texts, I only need the .contentShape(Rectangle()) modifier when the Text doesn't have a .background in order to make the entire Text frame responsive to tap gesture, while with buttons I use my Text or Image view with a frame and neither a .background nor a .contentShape is needed.
Image of the following code in preview (I'm not allowed to include pictures yet )
import SwiftUI
struct ContentView: View {
#State var tapped: Bool = true
var body: some View {
VStack {
RoundedRectangle(cornerRadius: 19)
.frame(width: 40, height: 40)
.foregroundColor(tapped ? .red : .green)
Spacer()
HStack (spacing: 0) {
Text("PP")
.frame(width: 40, height: 40)
.contentShape(Rectangle())
.onTapGesture {
tapped.toggle()
}
Button {
print("TAppeD")
tapped.toggle()
} label: {
Image(systemName: "plus")
.frame(width: 40, height: 40)
}
.background(Color.red)
Button {
print("TAppeD")
tapped.toggle()
} label: {
Text("My button")
.frame(height: 80)
}
.background(Color.yellow)
}
Spacer()
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
this way makes the button area expand properly
but if the color is .clear, it dosen't work🤷‍♂️
Button(action: {
doSomething()
}, label: {
ZStack {
Color(.white)
Text("some texts")
}
})
When I used HStack then it worked for button whole width that's fine, But I was facing issue with whole button height tap not working at corners and I fixed it in below code:
Button(action:{
print("Tapped Button")
}) {
VStack {
//Vertical whole area covered
Text("")
Spacer()
HStack {
//Horizontal whole area covered
Text("")
Spacer()
}
}
}
If your app needs to support both iOS/iPadOS and macOS, you may want to reference my code!
Xcode 14.1 / iOS 14.1 / macOS 13.0 / 12-09-2022
Button(action: {
print("Saved to CoreData")
}) {
Text("Submit")
.frame(minWidth: 100, maxWidth: .infinity, minHeight: 44, maxHeight: 60, alignment: .center)
.foregroundColor(Color.white)
#if !os(macOS)
.background(Color.accentColor)
#endif
}
#if os(macOS)
.background(Color.accentColor)
#endif
.cornerRadius(7)
Easier work around is to add .frame(maxWidth: .infinity) modifier.
and wrap your button inside a ContainerView. you can always change the size of the button where it's being used.
Button(action: tapped) {
HStack {
if let icon = icon {
icon
}
Text(title)
}
.frame(maxWidth: .infinity) // This one
}