I created a modal but it seems to have a bug on the selection. When scrolling the left, it scrolls the right, I have to go to the very edge of the left to be able to scroll, this is how it looks:
import SwiftUI
struct ContentView: View {
#State var showingModal = false
#State var hours: Int = 0
#State var minutes: Int = 0
var body: some View {
ZStack {
VStack {
Button("Show me"){
self.showingModal = true
}
if $showingModal.wrappedValue {
VStack(alignment: .center) {
ZStack{
Color.black.opacity(0.4)
.edgesIgnoringSafeArea(.vertical)
// this one is it
VStack(spacing: 20) {
Text("Time between meals")
.bold().padding()
.frame(maxWidth: .infinity)
.background(Color.yellow)
.foregroundColor(Color.white)
HStack {
Spacer()
VStack {
Picker("", selection: $hours){
ForEach(0..<4, id: \.self) { i in
Text("\(i) hours").tag(i)
}
}
.frame(width: 150, height: 120)
.clipped()
}
VStack {
Picker("", selection: $minutes){
ForEach(0..<60, id: \.self) { i in
Text("\(i) min").tag(i)
}
}
.frame(width: 150, height: 120)
.clipped()
}
}
Spacer()
Button(action: {
self.showingModal = false
}){
Text("Close")
} .padding()
}
.frame(width:300, height: 300)
.background(Color.white)
.cornerRadius(20).shadow(radius: 20)
}
}
}
}
}
}
}
How can I fix that little bug? I tried playing around with the layout but no use... any help would be appreciated
What if I told you the reason your Picker not working was this line?
.cornerRadius(20).shadow(radius: 20)
Unfortunately, SwiftUI is still quite buggy and sometimes it doesn't do what it is supposed to do and especially Pickers are not that reliable. I guess we'll need to wait and see the next iteration of SwiftUI, but for now you can replace that line with the code below:
.mask(RoundedRectangle(cornerRadius: 20))
.shadow(radius: 20)
There are just modifiers which affect all view hierarchy (ie. all subviews) that can change resulting layout/presentation/behaviour. And .cornerRadius and .shadow are such type modifiers.
The solution is to apply (as intended) those modifiers only to entire constructed view, and here it is
.compositingGroup() // <<< fix !!
.cornerRadius(20).shadow(radius: 20)
where .compositionGroup is intended to make above view hierarchy flat rendered and all below modifiers applied to only to that flat view.
Related
I'd like to implement an animation in SwiftUI that "reveals" the content of a view to enable expand/collapse functionality. The content of the view I want to collapse and expand is complex: It's not just a simple box, but it's a view hierarchy of dynamic height and content, including images and text.
I've experimented with different options, but it hasn't resulted in the desired effect. Usually what happens is that when I "expand", the whole view was shown right away with 0% opacity, then gradually faded in, with the buttons under the expanded view moving down at the same time. That's what happened when I was using a conditional if statement that actually added and removed the view. So that makes sense.
I then experimented with using a frame modifier: .frame(maxHeight: isExpanded ? .infinity : 0). But that resulted in the contents of the view being "squished" instead of revealed.
I made a paper prototype of what I want:
Any ideas on how to achieve this?
Something like this might work. You can modify the height of what you want to disclose to be 0 when hidden or nil when not so that it'll go for the height defined by the views. Make sure to clip the view afterwards so the contents are not visible outside of the frame's height when not disclosed.
struct ContentView: View {
#State private var isDisclosed = false
var body: some View {
VStack {
Button("Expand") {
withAnimation {
isDisclosed.toggle()
}
}
.buttonStyle(.plain)
VStack {
GroupBox {
Text("Hi")
}
GroupBox {
Text("More details here")
}
}
.frame(height: isDisclosed ? nil : 0, alignment: .top)
.clipped()
HStack {
Text("Cancel")
Spacer()
Text("Book")
}
}
.frame(maxWidth: .infinity)
.background(.thinMaterial)
.padding()
}
}
No, this wasn't trying to match your design, either. This was just to provide a sample way of creating the animation.
Consider the utilization of DisclosureGroup. The following code should be a good approach to your idea.
struct ContentView: View {
var body: some View {
List(0...20, id: \.self) { idx in
DisclosureGroup {
HStack {
Image(systemName: "person.circle.fill")
VStack(alignment: .leading) {
Text("ABC")
Text("Test Test")
}
}
HStack {
Image(systemName: "globe")
VStack(alignment: .leading) {
Text("ABC")
Text("X Y Z")
}
}
HStack {
Image(systemName: "water.waves")
VStack(alignment: .leading) {
Text("Bla Bla")
Text("123")
}
}
HStack{
Button("Cancel", role: .destructive) {}
Spacer()
Button("Book") {}
}
} label: {
HStack {
Spacer()
Text("Expand")
}
}
}
}
The result looks like:
I coded this in under 5 minutes. So of course the design can be optimized to your demands, but the core should be understandable.
import SwiftUI
struct TaskViewCollapsible: View {
#State private var isDisclosed = false
let header: String = "Review Page"
let url: String
let tasks: [String]
var body: some View {
VStack {
HStack {
VStack(spacing: 5) {
Text(header)
.font(.system(size: 22, weight: .semibold))
.foregroundColor(.black)
.padding(.top, 10)
.padding(.horizontal, 20)
.frame(maxWidth: .infinity, alignment: .leading)
Text(url)
.font(.system(size: 12, weight: .regular))
.foregroundColor(.black.opacity(0.4))
.padding(.horizontal, 20)
.frame(maxWidth: .infinity, alignment: .leading)
}
Spacer()
Image(systemName: self.isDisclosed ? "chevron.up" : "chevron.down")
.padding(.trailing)
.padding(.top, 10)
}
.onTapGesture {
withAnimation {
isDisclosed.toggle()
}
}
FetchTasks()
.padding(.horizontal, 20)
.padding(.bottom, 5)
.frame(height: isDisclosed ? nil : 0, alignment: .top)
.clipped()
}
.background(
RoundedRectangle(cornerRadius: 8)
.fill(.black.opacity(0.2))
)
.frame(maxWidth: .infinity)
.padding()
}
#ViewBuilder
func FetchTasks() -> some View {
ScrollView(.vertical, showsIndicators: true) {
VStack {
ForEach(0 ..< tasks.count, id: \.self) { value in
Text(tasks[value])
.font(.system(size: 16, weight: .regular))
.foregroundColor(.black)
.padding(.vertical, 0)
.frame(maxWidth: .infinity, alignment: .leading)
}
}
}
.frame(maxHeight: CGFloat(tasks.count) * 20)
}
}
struct TaskViewCollapsible_Previews: PreviewProvider {
static var previews: some View {
TaskViewCollapsible(url: "trello.com", tasks: ["Hello", "Hello", "Hello"])
}
}
I am having problems with making a simple systemIcon flash in SwiftUI.
I got the animation working, but it has a silly behaviour if the layout of
a LazyGridView changes or adapts. Below is a video of its erroneous behaviour.
The flashing bell stays in place but when the layout rearranges the bell
starts transitioning in from the bottom of the parent view thats not there anymore.
Has someone got a suggestion how to get around this?
Here is a working example which is similar to my problem
import SwiftUI
struct FlashingBellLazyVGrid: View {
#State var isAnimating = false
#State var showChart = true
var body: some View {
let columns = [GridItem(.adaptive(minimum: 300), spacing: 50, alignment: .center)]
VStack {
Button(action: {
showChart.toggle()
}) {
VStack {
Circle()
.fill(showChart ? Color.green : Color.red)
.shadow(color: Color.gray, radius: 5, x: 2, y: 2)
Text("Charts")
.foregroundColor(Color.primary)
}.frame(width: 150, height: 50)
}
ScrollView {
LazyVGrid (
columns: columns, spacing: 50
) {
ForEach(0 ..< 25) { item in
ZStack {
Rectangle()
.fill(Color.red)
.cornerRadius(15)
VStack {
HStack {
Text(/*#START_MENU_TOKEN#*/"Hello, World!"/*#END_MENU_TOKEN#*/)
Spacer()
Image(systemName: "bell.fill")
.foregroundColor(Color.yellow)
.opacity(self.isAnimating ? 1 : 0)
.animation(Animation.easeInOut(duration: 0.66).repeatForever(autoreverses: false))
.onAppear{ self.isAnimating = true }
}.padding(50)
if showChart {
Rectangle()
.fill(Color.green)
.frame(height: 200)
}
}
}
}
}
}
}
}
}
struct FlashingBellLazyVGrid_Previews: PreviewProvider {
static var previews: some View {
FlashingBellLazyVGrid()
}
}
how it looks like before you click the showChart button at the top
After you toggle the button it looks like the bells are erroneously moving into place from the bottom of the screen. and toggling it back to its original state doesn't resolve this bug subsequently.
[
Looks like the animation is basing itself off of the original size of the view. In order to trick it into recognizing the new view size, I used .id(UUID()) on the outside of the grid. In a real world application, you'd probably want to be careful to store this ID somewhere and only refresh it when needed -- not on every re-render like I'm doing:
struct FlashingBellLazyVGrid: View {
#State var showChart = true
let columns = [GridItem(.adaptive(minimum: 300), spacing: 50, alignment: .center)]
var body: some View {
VStack {
Button(action: {
showChart.toggle()
}) {
VStack {
Circle()
.fill(showChart ? Color.green : Color.red)
.shadow(color: Color.gray, radius: 5, x: 2, y: 2)
Text("Charts")
.foregroundColor(Color.primary)
}.frame(width: 150, height: 50)
}
ScrollView {
LazyVGrid (
columns: columns, spacing: 50
) {
ForEach(0 ..< 25) { item in
ZStack {
Rectangle()
.fill(Color.red)
.cornerRadius(15)
VStack {
SeparateComponent()
if showChart {
Rectangle()
.fill(Color.green)
.frame(height: 200)
}
}
}
}
}
.id(UUID()) //<-- Here
}
}
}
}
struct SeparateComponent : View {
#State var isAnimating : Bool = false
var body: some View {
HStack {
Text("Hello, World!")
Spacer()
Image(systemName: "bell.fill")
.foregroundColor(Color.yellow)
.opacity(self.isAnimating ? 1 : 0)
.animation(Animation.easeInOut(duration: 0.66).repeatForever(autoreverses: false))
.onAppear{
self.isAnimating = true
}
}
.padding(50)
}
}
I also separated out the blinking component into its own view, since there were already problematic things happening with the existing logic with onAppear, which wouldn't affect newly-scrolled-to items correctly. This may need refactoring for your particular case as well, but this should get you started.
I'm adding controls to a SwiftUI Form to assist the user enter data (and constrain the entries!). Although there is a lot to like about Forms, I've discovered that things that work nicely outside this container do very unexpected things inside it and it's not always obvious how to compensate for this.
The plan is to have the data field displayed as a single row. When the row is tapped, the control slides out from behind the data field - the row will need to expand (height) to accommodate the control.
I'm using Swift Playgrounds to develop the proof of concept (or failure in my case). The idea is to use a ZStack which will allow a nice sliding animation by overlaying the views and giving them a different zIndex and applying the offset when the data field view is tapped. Sounds simple but of course the Form row does not expand when the ZStack is expanded.
Adjusting the frame of the ZStack while expanding causes all sorts of weird changes in padding (or at least it looks like it) which can be compensated for by counter-offsetting the "top" view but this causes other unpredictable behaviour. Pointers and ideas gratefully accepted.
import SwiftUI
struct MyView: View {
#State var isDisclosed = false
var body: some View {
Form {
Spacer()
VStack {
ZStack(alignment: .topLeading) {
Rectangle()
.fill(Color.red)
.frame(width: 100, height: 100)
.zIndex(1)
.onTapGesture { self.isDisclosed.toggle() }
Rectangle()
.fill(Color.blue)
.frame(width: 100, height: 100)
.offset(y: isDisclosed ? 50 : 0)
.animation(.easeOut)
}
}
Spacer()
}
}
}
Collapsed stack
Expanded stack - view overlaps adjacent row
Result when adjusting ZStack vertical frame when expanded - top padding increases
Here is possible solution with fluent row height change (using AnimatingCellHeight modifier taken from my solution in SwiftUI - Animations triggered inside a View that's in a list doesn't animate the list as well ).
Tested with Xcode 11.4 / iOS 13.4
struct MyView: View {
#State var isDisclosed = false
var body: some View {
Form {
Spacer()
ZStack(alignment: .topLeading) {
Rectangle()
.fill(Color.red)
.frame(width: 100, height: 100)
.zIndex(1)
.onTapGesture { withAnimation { self.isDisclosed.toggle() } }
HStack {
Rectangle()
.fill(Color.blue)
.frame(width: 100, height: 100)
}.frame(maxHeight: .infinity, alignment: .bottom)
}
.modifier(AnimatingCellHeight(height: isDisclosed ? 150 : 100))
Spacer()
}
}
}
Use alignmentGuide instead of offset.
...
//.offset(y: isDisclosed ? 50 : 0)
.alignmentGuide(.top, computeValue: { dimension in dimension[.top] - (self.isDisclosed ? 50 : 0) })
...
offset doesn't affect its view's frame. that's why Form doesn't react as expected. On the contrary, alignmentGuide does.
I now have a working implementation using alignment guides as suggested by Kyokook. I have softened the somewhat jarring row height change by adding an opacity animation to the Stepper as it slides out. This also helps to prevent a slightly glitchy overlap of the row title when the control is closed.
struct ContentView: View {
// MARK: Logic state
#State private var years = 0
#State private var months = 0
#State private var weeks = 0
// MARK: UI state
#State var isStepperVisible = false
var body: some View {
Form {
Text("Row 1")
VStack {
// alignment guide must be explicit for the ZStack & all child ZStacks
// must use the same alignment guide - weird stuff happens otherwise
ZStack(alignment: .top) {
HStack {
Text("AGE")
.bold()
.font(.footnote)
Spacer()
Text("\(years) years \(months) months \(weeks) weeks")
.foregroundColor(self.isStepperVisible ? Color.blue : Color.gray)
}
.frame(height: 35) // TODO: Without this, text in HStack vertically offset. Investigate. (HStack align doesn't help)
.background(Color.white) // Prevents overlap of text during transition
.zIndex(3)
.contentShape(Rectangle())
.onTapGesture {
self.isStepperVisible.toggle()
}
HStack(alignment: .center) {
StepperComponent(value: $years, label: "Years", bounds: 0...30, isVisible: $isStepperVisible)
StepperComponent(value: $months, label: "Months", bounds: 0...12, isVisible: $isStepperVisible)
StepperComponent(value: $weeks, label: "Weeks", bounds: 0...4, isVisible: $isStepperVisible)
}
.alignmentGuide(.top, computeValue: { dimension in dimension[.top] - (self.isStepperVisible ? 40 : 0) })
}
}
Text("Row 3")
}
}
}
struct StepperComponent<V: Strideable>: View {
// MARK: Logic state
#Binding var value: V
var label: String
var bounds: ClosedRange<V>
//MARK: UI state
#Binding var isVisible: Bool
var body: some View {
ZStack(alignment: .top) {
Text(label.uppercased()).font(.caption).bold()
.frame(alignment: .center)
.zIndex(1)
.opacity(self.isVisible ? 1 : 0)
.animation(.easeOut)
Stepper(label, value: self.$value, in: bounds)
.labelsHidden()
.alignmentGuide(.top, computeValue: { dimension in dimension[.top] - (self.isVisible ? 25 : 0) })
.frame(alignment: .center)
.zIndex(2)
.opacity(self.isVisible ? 1 : 0)
.animation(.easeOut)
}
}
}
There is still some room for improvement here but on the whole I'm pleased with the result :-)
Thanks to both Kyokook (for putting me straight on offset()) and Asperi.
I think the Kyokook's solution (using AlignmentGuides) is simpler and would be my preference in that it's leveraging Apple's existing API and seems to cause less unpredictable movement of the views in their container. However, the row height changes abruptly and isn't synchronised. The animation in the Asperi's example is smoother but there is some bouncing of the views within the row (it's almost as if the padding or insets are changing and then being reset at the end of the animation). My approach to animation is a bit hit-and-miss so any further comments would be welcome.
Solution 1 (frame consistent, animation choppy):
struct ContentView: View {
#State var isDisclosed = false
var body: some View {
Form {
Text("Row 1")
VStack {
ZStack(alignment: .topLeading) {
Rectangle()
.fill(Color.red)
.frame(width: 100, height: 100)
.zIndex(1)
.onTapGesture {
self.isDisclosed.toggle()
}
Rectangle()
.fill(Color.blue)
.frame(width: 100, height: 100)
.alignmentGuide(.top, computeValue: { dimension in dimension[.top] - (self.isDisclosed ? 100 : 0) })
.animation(.easeOut)
Text("Row 3")
}
}
Text("Row 3")
}
}
}
Solution 2 (smoother animation but frame variance):
struct ContentView: View {
#State var isDisclosed = false
var body: some View {
Form {
Text("Row 1")
VStack {
ZStack(alignment: .topLeading) {
Rectangle()
.fill(Color.red)
.frame(width: 100, height: 100)
.zIndex(1)
.onTapGesture {
withAnimation { self.isDisclosed.toggle() }
}
HStack {
Rectangle()
.fill(Color.blue)
.frame(width: 100, height: 100)
}.frame(maxHeight: .infinity, alignment: .bottom)
}
.modifier(AnimatingCellHeight(height: isDisclosed ? 200 : 100))
}
Text("Row 3")
}
}
}
struct AnimatingCellHeight: AnimatableModifier {
var height: CGFloat = 0
var animatableData: CGFloat {
get { height }
set { height = newValue }
}
func body(content: Content) -> some View {
content.frame(height: height)
}
}
I changed the y offset of a list, and now it's being clipped.
I am trying to make it so that when you scroll, you can partially see the text underneath the Title and buttons at the top of the view. In other words, I want the top section of the screen to be slightly transparent.
I added the offset to the list, so that it didn't overlap with the information at the top.
The image above is with the VStack in my code showing. I thought that the VStack might be getting in the way, so I commented it out and the image below was the result:
Here's my code:
var body: some View {
ZStack {
VStack {
HStack {
Button(action: {self.showAccountView.toggle()}) {
Image(systemName: "person.fill")
.renderingMode(.original)
.font(.system(size: 20, weight: .bold))
.frame(width: 44, height: 44)
.modifier(NavButtons())
}
.sheet(isPresented: $showAccountView) {
AccountView()
}
Spacer()
Button(action: { self.showHelpCenter.toggle()}) {
Image(systemName: "questionmark")
.renderingMode(.original)
.font(.system(size: 20, weight: .bold))
.modifier(NavButtons())
}
.sheet(isPresented: $showHelpCenter) {
HelpCenter()
}
}
.frame(maxWidth: .infinity)
.padding(.horizontal)
Spacer()
}
List {
ForEach (store.allLogs) { thing in
VStack (alignment: .leading) {
HStack {
Text("\(thing.date) , \(thing.time)")
}
Text(thing.notes)
.multilineTextAlignment(.leading)
}
}
}.offset(y: 50)
}
}
EDIT:
This is one possible solution:
struct MyList: UIViewRepresentable {
func makeUIView(context: Context) -> UITableView {
let view = UITableView()
view.clipsToBounds = false
return view
}
func updateUIView(_ uiView: UITableView, context: Context) {
}
}
and then you would use makeUIView and updateUIView to update the cells. This is just messy and it's not really using SwiftUI at that point.
Second Edit
I've found this issue with a scrollView as well as a form:
The black is the background. Here's the code for all three:
Group {
List ((0 ... 10), id: \.self) {
Text("Row \($0)")
}
.offset(y: 200)
.border(Color.blue, width: 3)
.background(Color.black)
ScrollView {
Text("Text")
}
.foregroundColor(.white)
.offset(y: 200)
.border(Color.blue, width: 3)
.background(Color.black)
Form {
Text("Text")
}
.offset(y: 200)
.border(Color.blue, width: 3)
.background(Color.black)
}
Here are the wireframes of a List:
Here are the names of frames that are the same height as the List/Form/ScrollView:
List:
PlainList.BodyContent
ListCore.Container
ListRepresentable
View Host
TableWrapper
UpdateCoalescingTableView
Form:
GroupList.BodyContent
ListCore.Container
ListRepresentable
View Host
TableWrapper
UpdateCoalescingTableView
ScrollView:
ScrollViewBody
SystemScrollView
View Host
HostingScrollView
I guess that my question has changed from "how do I do this..." to "Why is this happening?"
I'm pretty confused about what exactly is going on.
UIScrollView.appearance().clipsToBounds = false
Stick this in the body of AppDelegate.swift -> applicationDidFinishLaunchingWithOptions(). It will make all scroll views across your application unclipped by default.
The problem is that a list has a table view (which is a scroll view) underneath. Scroll views by default are clipped. We just need to change that default.
Using LazyHStack instead of HStack solves the clipping problem.
I'm following SwiftUI tutorial to create my first app with SwiftUI but on TVOs and I don't know why but the scroll view item are with background color in grey, and when they are focussed they become white.
I don't find the way to change the color...
Can you help me please ?
My code :
struct LigneCategorie: View {
var nomCategorie: String
var items: [Recette]
var body: some View {
VStack(alignment: .leading) {
Text(self.nomCategorie)
.font(.headline)
.padding(.leading, 15)
.padding(.top, 5)
ScrollView(.horizontal, showsIndicators: false) {
HStack(alignment: .top) {
ForEach(self.items) { recette in
NavigationLink(
destination: RecetteDetail(
recette: recette
)
) {
CategoryItem(recette: recette)
}
}
}
}
.frame(height: 185)
}
}
}
struct CategoryItem: View {
var recette: Recette
var body: some View {
VStack(alignment: .leading) {
recette.image
.renderingMode(.original)
.resizable()
.frame(width: 200, height: 150)
.cornerRadius(10)
Text(recette.name)
.foregroundColor(.primary)
.font(.caption)
}
.padding(.leading, 15)
}
}
Thank you
You can set your school view's background in a preview side. when you click your scroll view you would see a chosen scroll view in preview mode Font,color and similar options must to be appear. But if not, then try this it should be useful.
ScrollView(.horizontal, showsIndicators: false) {
}.color(.gray)