Is it possible to create a custom horizontal indicator that has empty and filled circles to show how many images there are and the current position?
The below attempt uses a lazyHStack and OnAppear but, judging from the console output, it doesn't work properly since scrolling back and forth doesn't recall the onAppear consistently.
import SwiftUI
struct ContentView: View {
let horizontalScrollItems = ["wind", "hare.fill", "tortoise.fill", "rosette" ]
var body: some View {
GeometryReader { geometry in
ScrollView(.horizontal, showsIndicators: false) {
LazyHStack {
ForEach(horizontalScrollItems, id: \.self) { symbol in
Image(systemName: symbol)
.font(.system(size: 200))
.frame(width: geometry.size.width)
.onAppear(){print("\(symbol)")}
}
}
}
}
}
}
This is the desired indicator. I'm just not sure how to properly fill and empty each circle as the user scrolls back and forth. Appreciate the help!
You can get the desired result using TabView() and PageTabViewStyle()
Note : This will work from SwiftUI 2.0
Here is the code :
struct ContentView: View {
let horizontalScrollItems = ["wind", "hare.fill", "tortoise.fill", "rosette" ]
var body: some View {
GeometryReader { geometry in
TabView(){
ForEach(horizontalScrollItems, id: \.self) { symbol in
Image(systemName: symbol)
.font(.system(size: 200))
.frame(width: geometry.size.width)
}
}
.tabViewStyle(PageTabViewStyle())
.indexViewStyle(PageIndexViewStyle(backgroundDisplayMode: .always))
}
}
}
Result :
Related
Besides the funny fliped text issue (which is NOT important in this question), The following code generates a weird transition when used with . flipsForRightToLeftLayoutDirection(true) modifier:
struct ContentView: View {
var body: some View {
ScrollView(.horizontal, showsIndicators: false) {
LazyHStack {
ForEach(0..<10) {
Text("Item \($0)")
.foregroundColor(.white)
.frame(width: 100, height: 100)
.background(Color.red)
.contextMenu {
Button("delete", role: .destructive) { }
}
}
}
}
.flipsForRightToLeftLayoutDirection(true)
.environment(\.layoutDirection, .rightToLeft)
}
}
Take a look at this gif:
I have tried to apply .flipsForRightToLeftLayoutDirection(false) to the:
Text (after and before .contextMenu modifier
LazyHStack
And many other places and combinations with no luck.
How can I prevent these mysterious transitions?
I am having an alignment problem while using SwiftUI.
Maybe I should say a layout issue. Anyway here is the situation:
This is the relevant part of the app interface:
One can see that while the text ("+++++") is centered, the flag is not. It is slightly shifted to the left. This left-shifting is precisely my problem. I would like the image to be centered as the text is.
Here follows the code, I would like to know what I am doing wrong for the image not to be centered:
import SwiftUI
struct TheNiceView: View {
........
var body: some View {
VStack {
HStack {
Spacer()
TheButtonView()
Spacer()
}
HStack {
Spacer()
Button(action: {})
{
Text("+++++")
.font(.largeTitle)
.foregroundColor(.gray)
.fontWeight(.heavy)
}
Spacer()
}
}
}
}
struct TheButtonView: View {
........
let imgSide:CGFloat = 72.0
var body: some View {
HStack {
Button(action: {})
{
Image(uiImage: ThaiFlagImg)
.resizable()
.frame(width: imgSide, height: imgSide)
}
}
}
}
Just in case this may be useful, this is the image used for the flag:
1
Thailand flag has five horizontal stripes in the colours red, white, blue, white and red. The image you use has 7 srtips.
2
Using the Spacers and HStack are unnecessary.
I used the following image without the Spacers and HStack, both the +++ button and the flag are aligned in the center.
https://upload.wikimedia.org/wikipedia/commons/a/a9/Flag_of_Thailand.svg
struct TheNiceView: View {
var body: some View {
VStack {
TheButtonView()
Button(action: {}) {
Text("+++++")
.font(.largeTitle)
.foregroundColor(.gray)
.fontWeight(.heavy)
}
}
}
}
struct TheButtonView: View {
let imgSide:CGFloat = 72.0
var body: some View {
Button(action: {}){
Image( "ThaiFlagImg")
.resizable()
.frame(width: imgSide, height: imgSide)
}
}
}
I am trying to create a List View where rows looks like this:
However, I am unable to align the Circle on the leading side. Tried using Spacer(), HStack within VStack, it just doesn't work. Here's my code and its output.
struct PeopleView: View {
let people = ["Adam", "James"]
var body: some View {
NavigationView {
List {
ForEach(people, id: \.self) { person in
HStack {
Circle()
VStack {
Text("\(person)")
}
}
}
}
.navigationBarTitle("People", displayMode: .inline)
}
}
}
Actually you don't need shape itself in this case, but only as a mask to visually present text in circle.
So the solution can be like following
HStack {
Text(person.prefix(2).uppercased()).bold()
.foregroundColor(.white)
.padding()
.background(Color.red)
.mask(Circle()) // << shaping text !!
Spacer()
VStack {
Text("\(person)")
}
}
Some views in SwiftUI fill all available space. Such views are shapes, colors, spacers, dividers, and GeometryReader.
Your Circle is a shape and it behaves similarly like a Spacer (in terms of filling space).
If you replace Circle with an image of a circle it will work:
ForEach(people, id: \.self) { person in
HStack {
Image(systemName: "circle.fill")
.imageScale(.large)
Spacer()
VStack {
Text("\(person)")
}
}
}
That is happening because you did not give a fixed (or relative) frame to the Circle Shape, so the Circle is taking up the maximum available width.
If you add a frame(width:height:), everything should work correctly:
struct PeopleView: View {
let people = ["Adam", "James"]
var body: some View {
NavigationView {
List {
ForEach(people, id: \.self) { person in
HStack {
Circle()
.frame(width: 50, height: 50)
VStack {
Text("\(person)")
}
}
}
}
.navigationBarTitle("People", displayMode: .inline)
}
}
}
I have a complex view in List row:
var body: some View {
VStack {
VStack {
FullWidthImageView(ad)
HStack {
Text("\(self.price) \(self.ad.currency!)")
.font(.headline)
Spacer()
SwiftUI.Image(systemName: "heart")
}
.padding([.top, .leading, .trailing], 10.0)
Where FullWidthImageView is view with defined contexMenu modifier.
But when I long-press on an image I see not the only image in preview, but all row view.
There is no other contextMenu on any element.
How to make a preview in context with image only?
UPD. Here is a simple code illustrating the problem
We don't have any idea why in your case it doesn't work, until we see your FullWidthImageView and how you construct the context menu. Asperi's answer is working example, and it is correctly done! But did it really explain your trouble?
The trouble is that while applying .contextMenu modifier to only some part of your View (as in your example) we have to be careful.
Let see some example.
import SwiftUI
struct FullWidthImageView: View {
#ObservedObject var model = modelStore
var body: some View {
VStack {
Image(systemName: model.toggle ? "pencil.and.outline" : "trash")
.resizable()
.aspectRatio(contentMode: .fit)
.frame(width: 200)
}.contextMenu(ContextMenu {
Button(action: {
self.model.toggle.toggle()
}) {
HStack {
Text("toggle image to?")
Image(systemName: model.toggle ? "trash" : "pencil.and.outline")
}
}
Button("No") {}
})
}
}
class Model:ObservableObject {
#Published var toggle = false
}
let modelStore = Model()
struct ContentView: View {
#ObservedObject var model = modelStore
var body: some View {
VStack {
FullWidthImageView()
Text("Long press the image to change it").bold()
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
while running, the "context menu" modified View seems to be "static"!
Yes, on long press, you see the trash image, even though it is updated properly while you dismiss the context view. On every long press you see trash only!
How to make it dynamic? I need that the image will be the same, as on my "main View!
Here we have .id modifier. Let see the difference!
First we have to update our model
class Model:ObservableObject {
#Published var toggle = false
var id: UUID {
UUID()
}
}
and next our View
FullWidthImageView().id(model.id)
Now it works as we expected.
For another example, where "standard" state / binding simply doesn't work check SwiftUI hierarchical Picker with dynamic data crashes
UPDATE
As a temporary workaround you can mimic List by ScrollView
import SwiftUI
struct Row: View {
let i:Int
var body: some View {
VStack {
Image(systemName: "trash")
.resizable()
.aspectRatio(contentMode: .fit)
.frame(width: 200)
.contextMenu(ContextMenu {
Button("A") {}
Button("B") {}
})
Text("I don’t want to show in preview because I don’t have context menu modifire").bold()
}.padding()
}
}
struct ContentView: View {
var body: some View {
VStack {
ScrollView {
ForEach(0 ..< 20) { (i) in
VStack {
Divider()
Row(i: i)
}
}
}
}
}
}
It is not optimal, but in your case it should work
Here is a code (simulated possible your scenario) that works, ie. only image is shown for context menu preview (tested with Xcode 11.3+).
struct FullWidthImageView: View {
var body: some View {
Image("auto")
.resizable()
.aspectRatio(contentMode: .fit)
.frame(width: 200)
.contextMenu(ContextMenu() {
Button("Ok") {}
})
}
}
struct TestContextMenu: View {
var body: some View {
VStack {
VStack {
FullWidthImageView()
HStack {
Text("100 $")
.font(.headline)
Spacer()
Image(systemName: "heart")
}
.padding([.top, .leading, .trailing], 10.0)
}
}
}
}
It's buried in the replies here, but the key discovery is that List is changing the behavior of .contextMenu -- it creates "blocks" that pop up with the menu instead of attaching the menu to the element specified. Switching out List for ScrollView fixes the issue.
I'm trying to reproduce the Apple tutorial(Composing Complex Interfaces) and I have a very weird problem. My CategoryItem view is being displayed as a blue frame.
If I remove the NavigationLink which wraps it, everything works fine but with that one it doesn't.
struct CategoryRow: View {
var categoryName: String
var items: [Landmark]
var body: some View {
VStack(alignment: .leading) {
Text(self.categoryName)
.font(.headline)
.padding(.leading, 15)
.padding(.top, 5)
ScrollView(.horizontal, showsIndicators: false) {
HStack(alignment: .top, spacing: 0) {
ForEach(self.items) { landmark in
NavigationLink(
destination: LandmarkDetail(
landmark: landmark
)
) {
CategoryItem(landmark: landmark)
}
}
}
}.frame(height: 185)
}
}
}
NavigationLink has a blue accent color by default, just call .accentColor(Color.clear) on it
Or you could try this:
NavigationView {
NavigationLink(destination: Text("Detail view here")) {
Image("YourImage")
}
.buttonStyle(PlainButtonStyle())
}
https://www.hackingwithswift.com/quick-start/swiftui/how-to-disable-the-overlay-color-for-images-inside-button-and-navigationlink
renderingMode(.original) is what did it for me; .accentColor(Color.clear) made the image invisible (my best explanation here is because it didn't have a transparency).
NavigationView {
NavigationLink(destination: Text("Detail view here")) {
Image("YourImage")
.renderingMode(.original)
}
}
As the answer above mentioned, How to disable the overlay color for images inside Button and NavigationLink is a good write up as well.