I'm trying to connect 2 views. One is a ScrollView and the other is a List. Does anyone know how to do that? Putting both into a singular ScrollView doesn't work, and calling APIResponseView().environmentObject(Model()) inside of ContentView() also doesn't work.
struct MyApp: App {
var body: some Scene {
WindowGroup {
VStack{
ContentView() // this is a ScrollView
APIResponseView().environmentObject(Model()) // this is a List
}
}
}
}
As you can see, the views aren't connected:
Image found here
If you want to have the ScrollView move out of view when scrolling the list, you have to put the ScrollView INSIDE the list:
struct ContentView: View {
#State private var test = false
var body: some View {
// List
List {
// ScrollView
ScrollView(.horizontal) {
HStack {
ForEach(0..<6) { i in
Text("ScrollView \(i)")
.frame(width: 150, height: 200)
.background(
RoundedRectangle(cornerRadius: 10)
.fill(.blue)
)
}
}
}
ForEach(0..<10) { item in
HStack {
VStack {
Text("Overheadline")
.font(.caption)
.foregroundColor(.secondary)
Text("List Item \(item)")
}
Spacer()
RoundedRectangle(cornerRadius: 10)
.fill(.gray)
.frame(width: 50, height: 50)
}
}
}
.listStyle(.plain)
}
}
Related
I am trying to understand MatchGeometryEffect a little better. I am trying to put it on each cell of a list in a scrollView. I want it to be where if showAlternate is false, the main cell is show but if showAlternate is true , then the individual cell will show the else of the conditional which would be a larger cell ( not part of the code yet). I have the matchedGeometryEffect on the ForEach right now but how can I do each cell indvidually?
struct ContentView: View {
#Binding var countries: [Country]
#State var showAlternate = false;
#Namespace var namespace;
var body: some View {
NavigationView {
ScrollView {
ForEach(Array(countries.enumerated()), id: \.1.id) { (index,country) in
LazyVStack {
HStack {
NavigationLink(
destination: CountryView(country: country),
label: {
HStack {
Image(country.image)
.resizable()
.scaledToFit()
Text(country.display_name)
.foregroundColor(Color.black)
.padding(.leading)
Spacer()
}
.padding(.top, 12.0)
.frame(height: 80)
}
).buttonStyle(FlatLinkStyle())
}
.padding(.horizontal, 16.0)
.overlay(Divider(), alignment: .top)
}
}
.background(Rectangle().opacity(0.2).matchedGeometryEffect(id: "shape", in: namespace))
}
}
.font(Font.custom("Avenir", size: 22))
}
}
I can't find the answer to this anywhere, hopefully one of you can help me out.
I have a MainView with some content. And with the press of a button I want to open a DetailView. I am using a ZStack to layer the DetailView on the top, filling the screen.
But with the following code I can't get it to work. The DetailView does not have a transition when it inserts and it stops at removal. I have tried with and without setting the zIndex manually, and a custom assymetricalTransition. Couldn't get that to work. Any solutions?
//MainView
#State var showDetail: Bool = false
var body: some View {
ZStack {
VStack {
Text("Hello MainWorld")
Button(action: {
withAnimation(.spring()) {
self.showDetail.toggle()
}
}) {
Text("Show detail")
}
}
if showDetail {
ContentDetail(showDetail: $showDetail)
.transition(.move(edge: .bottom))
}
}
.edgesIgnoringSafeArea(.all)
}
And here is the DetailView:
//DetailView
#Binding var showDetail: Bool
var body: some View {
VStack (spacing: 25) {
Text("Hello, DetailWorld!")
Button(action: { withAnimation(.spring()) {
self.showDetail.toggle()
}
}) {
Text("Close")
}
.padding(.bottom, 50)
}
.frame(width: UIScreen.main.bounds.width,
height: UIScreen.main.bounds.height)
.background(Color.yellow)
.edgesIgnoringSafeArea(.all)
}
The result of this code is this:
I'm running Xcode 11.4.1 so implicit animations doesn't seem to work either. Really stuck here, hope one of you can help me out! Thanks :)
Here is a solution. Tested with Xcode 11.4 / iOS 13.4.
struct MainView: View {
#State var showDetail: Bool = false
var body: some View {
ZStack {
Color.clear // extend ZStack to all area
VStack {
Text("Hello MainWorld")
Button(action: {
self.showDetail.toggle()
}) {
Text("Show detail")
}
}
if showDetail {
DetailView(showDetail: $showDetail)
.transition(AnyTransition.move(edge: .bottom))
}
}
.animation(Animation.spring()) // one animation to transitions
.edgesIgnoringSafeArea(.all)
}
}
struct DetailView: View {
#Binding var showDetail: Bool
var body: some View {
VStack (spacing: 25) {
Text("Hello, DetailWorld!")
Button(action: {
self.showDetail.toggle()
}) {
Text("Close")
}
.padding(.bottom, 50)
}
.frame(maxWidth: .infinity, maxHeight: .infinity) // fill in container
.background(Color.yellow)
}
}
My goal is to have custom modals present over an root view that is essentially a tabbed view. So, I wrapped the TabView in a ZStack and am using an ObservableOBject. But I don't feel I'm doing it the right way.
In my other file, I have the Custom modal "subviews" which has an enum, too, which I think is the right approach to take. But I cannot figure out how to dismiss a modal after it is visible.
It must be #EnvironmentObject, but I don't know what if anything to put in the scene delegate, etc. ("Hacking with Swift" is failing me here, although it's a great resource.)
My idea is that views from the tabbed view will have various buttons which present different modal views, populated later with data specific to say a user and set of fields for data entry.
Right now, I just want to understand how to present and dismiss them.
Here is my root view
import SwiftUI
struct ContentView: View {
#ObservedObject var modal = CustomModal()
var body: some View {
ZStack {
TabView {
ZStack {
Color.pink.opacity(0.2)
Button(action: {
withAnimation{
self.modal.visibleModal = VisibleModal.circle
}
}) {
Text("Circle").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.pink.opacity(0.5)).foregroundColor(.white)
.cornerRadius(12)
}
.tabItem{
VStack{
Image(systemName: "1.square.fill")
Text("One")
}
}.tag(1)
ZStack {
Color.blue.opacity(0.2)
Button(action: {
self.modal.visibleModal = VisibleModal.squircle
}) {
Text("Square").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.blue.opacity(0.5)).foregroundColor(.white)
.cornerRadius(12)
}
.tabItem{
VStack{
Image(systemName: "2.square.fill")
Text("Two")
}
}.tag(2)
}.accentColor(.purple)
VStack {
containedView()
}
}
}
func containedView() -> AnyView {
switch modal.visibleModal {
case .circle: return AnyView(CircleView())
case .squircle: return AnyView(SquircleView())
case .none: return AnyView(Text(""))
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
And here is my second file with the enum and "subview" modals
import SwiftUI
class CustomModal: ObservableObject {
#Published var visibleModal: VisibleModal = VisibleModal.none
}
enum VisibleModal {
case circle, squircle, none
}
struct CircleView: View {
var body: some View {
ZStack {
Color.pink.blur(radius: 0.4)
Circle().fill()
.frame(width: 300)
.foregroundColor(Color.white.opacity(0.75))
dismissButton()
}.edgesIgnoringSafeArea(.all)
}
}
struct SquircleView: View {
var body: some View {
ZStack{
Color.green.blur(radius: 0.4)
RoundedRectangle(cornerRadius: 48, style: .continuous)
.frame(width: 300, height: 300).foregroundColor(Color.white.opacity(0.75))
dismissButton()
}.edgesIgnoringSafeArea(.all)
}
}
struct dismissButton: View {
#ObservedObject var modal = CustomModal()
var body: some View {
VStack{
Spacer()
Button(action: {
self.modal.visibleModal = VisibleModal.none
}) {
Text("Dismiss").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.white.opacity(0.35)).foregroundColor(.white)
.cornerRadius(12)
.padding(.bottom, 44)
}
}
}
Are you just trying to pass your observable object to the new view?
func containedView() -> some View {
switch modal.visibleModal {
case .circle: return CircleView()
.environmentObject(self.modal)
case .squircle: return SquircleView()
.environmentObject(self.modal)
case .none: return Text("")
}
}
Unless I am misunderstanding the question.
Okay, after a lot of fiddling, it works.
Now my code is as follows.
Root view
struct ContentView: View {
#EnvironmentObject var isModalVisible: CustomModal
#ObservedObject var modal = CustomModal()
var body: some View {
ZStack {
TabView {
ZStack {
Color.pink.opacity(0.2)
Button(action: {
withAnimation{
self.isModalVisible.isModalVisible.toggle()
self.modal.currentModal = VisibleModal.circle
}
}) {
Text("Circle").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.pink.opacity(0.5)).foregroundColor(.white)
.cornerRadius(12)
}
.tabItem{
VStack{
Image(systemName: "1.square.fill")
Text("One")
}
}.tag(1)
ZStack {
Color.blue.opacity(0.2)
Button(action: {
self.isModalVisible.isModalVisible.toggle()
self.modal.currentModal = VisibleModal.squircle
}) {
Text("Square").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.blue.opacity(0.5)).foregroundColor(.white)
.cornerRadius(12)
}
.tabItem{
VStack{
Image(systemName: "2.square.fill")
Text("Two")
}
}.tag(2)
}.accentColor(.purple)
if self.isModalVisible.isModalVisible {
VStack {
containedView()
}
}
}
}
func containedView() -> AnyView {
switch modal.currentModal {
case .circle: return AnyView(CircleView())
case .squircle: return AnyView(SquircleView())
case .none: return AnyView(Text(""))
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView().environmentObject(CustomModal())
}
}
and the second file with the supporting views and classes and enums:
import SwiftUI
class CustomModal: ObservableObject {
#Published var isModalVisible = false
#Published var currentModal: VisibleModal = .none
}
enum VisibleModal {
case circle, squircle, none
}
struct CircleView: View {
#EnvironmentObject var env: CustomModal
var body: some View {
ZStack {
Color.pink.blur(radius: 0.4)
Circle().fill()
.frame(width: 300)
.foregroundColor(Color.white.opacity(0.75))
dismissButton()
}.edgesIgnoringSafeArea(.all)
}
}
struct SquircleView: View {
var body: some View {
ZStack{
Color.green.blur(radius: 0.4)
RoundedRectangle(cornerRadius: 48, style: .continuous)
.frame(width: 300, height: 300).foregroundColor(Color.white.opacity(0.75))
dismissButton()
}.edgesIgnoringSafeArea(.all)
}
}
struct dismissButton: View {
#EnvironmentObject var env: CustomModal
var body: some View {
VStack{
Spacer()
Button(action: {
self.env.isModalVisible.toggle()
print("TAPPED")
}) {
Text("Dismiss").font(.headline)
}
.frame(width: 270, height: 64)
.background(Color.white.opacity(0.35)).foregroundColor(.white)
.cornerRadius(12)
.padding(.bottom, 44)
}
}
}
It still can be refactored. I'm sure. I'd also be happy to hear any comments on how to improve it. But it seems to work.
NOTE: This code ContentView().environmentObject(CustomModal()) is put in the previewP{rovider code and in SceneDelegate.
The question is as simple as in the title. I am trying to put a Picker which has the style of SegmentedPickerStyle to NavigationBar in SwiftUI. It is just like the native Phone application's history page. The image is below
I have looked for Google and Github for example projects, libraries or any tutorials and no luck. I think if nativa apps and WhatsApp for example has it, then it should be possible. Any help would be appreciated.
SwiftUI 2 + toolbar:
struct DemoView: View {
#State private var mode: Int = 0
var body: some View {
Text("Hello, World!")
.toolbar {
ToolbarItem(placement: .principal) {
Picker("Color", selection: $mode) {
Text("Light").tag(0)
Text("Dark").tag(1)
}
.pickerStyle(SegmentedPickerStyle())
}
}
}
}
You can put a Picker directly into .navigationBarItems.
The only trouble I'm having is getting the Picker to be centered. (Just to show that a Picker can indeed be in the Navigation Bar I put together a kind of hacky solution with frame and Geometry Reader. You'll need to find a proper solution to centering.)
struct ContentView: View {
#State private var choices = ["All", "Missed"]
#State private var choice = 0
#State private var contacts = [("Anna Lisa Moreno", "9:40 AM"), ("Justin Shumaker", "9:35 AM")]
var body: some View {
GeometryReader { geometry in
NavigationView {
List {
ForEach(self.contacts, id: \.self.0) { (contact, time) in
ContactView(name: contact, time: time)
}
.onDelete(perform: self.deleteItems)
}
.navigationBarTitle("Recents")
.navigationBarItems(
leading:
HStack {
Button("Clear") {
// do stuff
}
Picker(selection: self.$choice, label: Text("Pick One")) {
ForEach(0 ..< self.choices.count) {
Text(self.choices[$0])
}
}
.frame(width: 130)
.pickerStyle(SegmentedPickerStyle())
.padding(.leading, (geometry.size.width / 2.0) - 130)
},
trailing: EditButton())
}
}
}
func deleteItems(at offsets: IndexSet) {
contacts.remove(atOffsets: offsets)
}
}
struct ContactView: View {
var name: String
var time: String
var body: some View {
HStack {
VStack {
Image(systemName: "phone.fill.arrow.up.right")
.font(.headline)
.foregroundColor(.secondary)
Text("")
}
VStack(alignment: .leading) {
Text(self.name)
.font(.headline)
Text("iPhone")
.foregroundColor(.secondary)
}
Spacer()
Text(self.time)
.foregroundColor(.secondary)
}
}
}
For those who want to make it dead center, Just put two HStack to each side and made them width fixed and equal.
Add this method to View extension.
extension View {
func navigationBarItems<L, C, T>(leading: L, center: C, trailing: T) -> some View where L: View, C: View, T: View {
self.navigationBarItems(leading:
HStack{
HStack {
leading
}
.frame(width: 60, alignment: .leading)
Spacer()
HStack {
center
}
.frame(width: 300, alignment: .center)
Spacer()
HStack {
//Text("asdasd")
trailing
}
//.background(Color.blue)
.frame(width: 100, alignment: .trailing)
}
//.background(Color.yellow)
.frame(width: UIScreen.main.bounds.size.width-32)
)
}
}
Now you have a View modifier which has the same usage of navigationBatItems(:_). You can edit the code based on your needs.
Usage example:
.navigationBarItems(leading: EmptyView(), center:
Picker(selection: self.$choice, label: Text("Pick One")) {
ForEach(0 ..< self.choices.count) {
Text(self.choices[$0])
}
}
.pickerStyle(SegmentedPickerStyle())
}, trailing: EmptyView())
UPDATE
There was the issue of leading and trailing items were violating UINavigationBarContentView's safeArea. While I was searching through, I came across another solution in this answer. It is little helper library called SwiftUIX. If you do not want install whole library -like me- I created a gist just for navigationBarItems. Just add the file to your project.
But do not forget this, It was stretching the Picker to cover all the free space and forcing StatusView to be narrower. So I had to set frames like this;
.navigationBarItems(center:
Picker(...) {
...
}
.frame(width: 150)
, trailing:
StatusView()
.frame(width: 70)
)
If you need segmentcontroll to be in center you need to use GeometryReader, below code will provide picker as title, and trailing (right) button.
You set up two view on the sides left and right with the same width, and the middle view will take the rest.
5 is the magic number depends how width you need segment to be.
You can experiment and see the best fit for you.
GeometryReader {
Text("TEST")
.navigationBarItems(leading:
HStack {
Spacer().frame(width: geometry.size.width / 5)
Spacer()
picker
Spacer()
Button().frame(width: geometry.size.width / 5)
}.frame(width: geometry.size.width)
}
But better solution is if you save picker size and then calculate other frame sizes, so picker will be same on ipad & iphone
#State var segmentControllerWidth: CGFloat = 0
var body: some View {
HStack {
Spacer()
.frame(width: (geometry.size.width / 2) - (segmentControllerWidth / 2))
.background(Color.red)
segmentController
.fixedSize()
.background(PreferenceViewSetter())
profileButton
.frame(width: (geometry.size.width / 2) - (segmentControllerWidth / 2))
}
.onPreferenceChange(PreferenceViewKey.self) { preferences in
segmentControllerWidth = preferences.width
}
}
struct PreferenceViewSetter: View {
var body: some View {
GeometryReader { geometry in
Rectangle()
.fill(Color.clear)
.preference(key: PreferenceViewKey.self,
value: PreferenceViewData(width: geometry.size.width))
}
}
}
struct PreferenceViewData: Equatable {
let width: CGFloat
}
struct PreferenceViewKey: PreferenceKey {
typealias Value = PreferenceViewData
static var defaultValue = PreferenceViewData(width: 0)
static func reduce(value: inout PreferenceViewData, nextValue: () -> PreferenceViewData) {
value = nextValue()
}
}
Simple answer how to center segment controller and hide one of the buttons.
#State var showLeadingButton = true
var body: some View {
HStack {
Button(action: {}, label: {"leading"})
.opacity(showLeadingButton ? true : false)
Spacer()
Picker(selection: $selectedStatus,
label: Text("SEGMENT") {
segmentValues
}
.id(UUID())
.pickerStyle(SegmentedPickerStyle())
.fixedSize()
Spacer()
Button(action: {}, label: {"trailing"})
}
.frame(width: UIScreen.main.bounds.width)
}
In my SwiftUI application, I'm trying to implement a UI similar to this:
I've added the two rows for category 1 and category 2. The result looks like this:
NavigationView {
VStack(alignment: .leading) {
CategoryRow(...)
CategoryRow(...)
Spacer()
}
.navigationBarTitle(Text("Featured"))
}
Now, when added the view for the third category – an VStack with images – the following happens:
This happened, after I replaced Spacer(), with said VStack:
VStack(alignment: .leading) {
Text("Rivers")
.font(.headline)
ForEach(self.categories["Rivers"]!.identified(by: \.self)) { landmark in
landmark.image(forSize: 200)
}
}
My CategoryRow is implemented as follows:
VStack(alignment: .leading) {
Text(title)
.font(.headline)
ScrollView {
HStack {
ForEach(landmarks) { landmark in
CategoryItem(landmark: landmark, isRounded: self.isRounded)
}
}
}
}
Question
It seems that the views are compressed. I was not able to find any compression resistance or content hugging priority modifiers to fix this.
I also tried to use .fixedSize() and .frame(width:height:) on CategoryRow.
How can I prevent the compression of these views?
Update
I've tried embedding the whole outer stack view in a scroll view:
NavigationView {
ScrollView { // also tried List
VStack(alignment: .leading) {
CategoryRow(...)
CategoryRow(...)
ForEach(...) { landmark in
landmark.image(forSize: 200)
}
}
.navigationBarTitle(Text("Featured"))
}
}
...and the result is worse:
You might prevent the views in VStack from being compressed by using
.fixedSize(horizontal: false, vertical: true)
For example:
I have the following VStack:
VStack(alignment: .leading){
ForEach(group.items) {
FeedCell(item: $0)
}
}
Which render compressed Text()
When I add .fixedSize(horizontal: false, vertical: true)
it doesn't compress anymore
VStack(alignment: .leading){
ForEach(group.items) {
FeedCell(item: $0)
.fixedSize(horizontal: false, vertical: true)
}
}
You could try to add a layoutPriority()operator to your first VStack. This is what the documentation says about the method:
In a group of sibling views, raising a view’s layout priority encourages that view to shrink later when the group is shrunk and stretch sooner when the group is stretched.
So it's a bit like the content compression resistance priority in Autolayout. But the default value here is 0, so you just have to set it to 1 to get the desired effect, like this:
VStack(alignment: .leading) {
CategoryRow(...)
CategoryRow(...)
Spacer()
}.layoutPriority(1)
VStack(alignment: .leading) {
...
}
Hope it works!
It looks like is not enough space for all your views in VStack, and it compresses some of them. You can embed it into the ScrollView
NavigationView {
ScrollView {
VStack(alignment: .leading) {
CategoryRow(...)
CategoryRow(...)
/// you images and so on
}
}
}
struct ContentView1: View {
var body: some View {
NavigationView {
ScrollView {
VStack {
CategoryListView {
CategoryView()
}
CategoryListView {
SquareCategoryView()
}
CategoryListView {
RectangleCategoryView()
}
}
.padding()
}
.navigationTitle("Featured")
}
}
}
struct CategoryListView<Content>: View where Content: View {
private let viewSize: CGFloat = 150
var content: () -> Content
init(#ViewBuilder content: #escaping () -> Content) {
self.content = content
}
var body: some View {
VStack {
HStack {
Text("Category name")
Spacer()
}
ScrollView(.horizontal, showsIndicators: false){
HStack {
ForEach(0..<10) { _ in
content()
}
}
}
}
}
}
struct ContentView1_Previews: PreviewProvider {
static var previews: some View {
ContentView1()
}
}
struct CategoryView: View {
private let viewSize: CGFloat = 150
var body: some View {
Circle()
.fill()
.foregroundColor(.blue)
.frame(width: viewSize, height: viewSize)
}
}
struct RectangleCategoryView: View {
private let viewSize: CGFloat = 350
var body: some View {
Rectangle()
.fill()
.foregroundColor(.blue)
.frame(width: viewSize, height: viewSize * 9 / 16)
}
}
struct SquareCategoryView: View {
private let viewSize: CGFloat = 150
var body: some View {
Rectangle()
.fill()
.foregroundColor(.blue)
.frame(width: viewSize, height: viewSize)
}
}
I think your topmost view (in the NavigationView) needs to be a List, so that it is scrollable:
NavigationView {
List {
...
Or use a ScrollView.
A stack automatically fits within a screen. If you want your content to exceed this, you would have used a ScrollView or a TableView etc i UIKit
EDIT:
Actually, a little Googling brought this result, which seems to be exactly what you are making:
https://developer.apple.com/tutorials/swiftui/composing-complex-interfaces