Animation transition scale does not work in swiftui - swiftui

I am trying to run the following transition in a View but does not work as expected. The HELLO WORLD Text should be at first visible. Then on tap of the button it should scale based on the private var zoomOutTransition. The transition is triggered but i see a second Text staying on the screen. Any help appreciated!!!
import SwiftUI
public struct SimpleAnimation: View {
#State
private var scaleEightImage = false
private var zoomOutTransition: AnyTransition {
return .asymmetric(
insertion: .identity.animation(nil),
removal: .scale(
scale: 1000, anchor: UnitPoint(x: 0.494, y: 0.05))
.animation(
.easeInOut(duration: 10.0)
.delay(0.1)
)
)
}
public var body: some View {
ZStack {
Color.clear
VStack {
Spacer()
if scaleEightImage {
Text("HELLO WORLD!")
.foregroundColor(Color.black)
.transition(zoomOutTransition)
} else if !scaleEightImage {
Text("HELLO WORLD!")
.foregroundColor(Color.black)
}
}
VStack {
Button {
DispatchQueue.main.asyncAfter(deadline: .now() + 2) {
withAnimation {
viewModel.scaleEightImage.toggle()
}
}
} label: {
Text("tappppp me")
.foregroundColor(Color.black)
}
}
}
}

The text stays on the screen because you have 2 Text() views - one that shows when scaleEightImage is true, another one for when scaleEightImage is false.
You just need to show the text only when scaleEightImage is false:
VStack {
Spacer()
if !scaleEightImage {
Text("HELLO WORLD!")
.foregroundColor(Color.black)
.transition(zoomOutTransition)
}
}

Related

swiftui transition not work on extracted view

I just build a small pop up with .spring() animation that I want to use later in my app, but the back transition is not smooth. It simply disappear from the hierarchy. So here is my code:
struct TestPopUp: View {
#State var screen: Bool = false
var body: some View {
ZStack {
Color.white
.edgesIgnoringSafeArea(.all)
VStack {
Button("Click") {
withAnimation(.spring()) {
screen.toggle()
}
}
.font(.largeTitle)
if screen {
NewScreen(screen: $screen)
.padding(.top, 300)
.transition(.move(edge: .bottom))
}
}
struct NewScreen: View {
#Binding var screen: Bool
var body: some View {
ZStack(alignment: .topLeading) {
Color.black
.edgesIgnoringSafeArea(.all)
Button {
screen.toggle()
} label: {
Image(systemName: "xmark")
.foregroundColor(.white)
.font(.largeTitle)
.padding(20)
}
}
}
}
Transition popup
As you can see in the video, the view disappears. But I want the same transition backwards.
You have to animate the transition both ways, in and out. Therefore, NewScreen becomes:
struct NewScreen: View {
#Binding var screen: Bool
var body: some View {
ZStack(alignment: .topLeading) {
Color.black
.edgesIgnoringSafeArea(.all)
Button {
withAnimation(.spring()) { // Animate here!
screen.toggle()
}
} label: {
Image(systemName: "xmark")
.foregroundColor(.white)
.font(.largeTitle)
.padding(20)
}
}
}
}

Problem implementing scrollTo in SwiftUI using Slider and Button

I'm trying to reposition a list using scrollTo with a Slider and Button and have 2 problems. The list has Sections with id's and nested Texts below, so the scrolling (by Slider or Button) is to the Section heads only.
Here are the problems:
Slider works fine except that the animation briefly shows the list at the top (you can see the navigationTitle go to full size) before it scrolls to the desired position correctly.
The Button moves the Slider but appears to not find the id's in the Section, so it doesn't reposition to the right Section.
Anyone have any ideas?
struct Floors: Identifiable {
let id: String
let name: String
}
struct UnitLine: Identifiable {
let id=UUID()
let name: String
}
struct UnitKeyboardView: View {
#Environment(\.presentationMode) var presentationMode
#State private var sliderValue = 8.0
var body: some View {
let floors=[Floors(id:"8",name:"8"),Floors(id:"9",name:"9"),Floors(id:"10",name:"10"),Floors(id:"11",name:"11"),Floors(id:"12",name:"12"),Floors(id:"13",name:"13"),Floors(id:"14",name:"14"),Floors(id:"15",name:"15"),Floors(id:"16",name:"16"),Floors(id:"17",name:"17"),Floors(id:"18",name:"18"),Floors(id:"19",name:"19"),Floors(id:"20",name:"20"),Floors(id:"21",name:"21"),Floors(id:"22",name:"22"),Floors(id:"23",name:"23"),Floors(id:"24",name:"24"),Floors(id:"25",name:"25"),Floors(id:"26",name:"26"),Floors(id:"27",name:"27"),Floors(id:"28",name:"28"),Floors(id:"29",name:"29")]
let unitlines=[UnitLine(name:"01"),UnitLine(name:"02"),UnitLine(name:"03"),UnitLine(name:"04"),UnitLine(name:"05"),UnitLine(name:"06"),UnitLine(name:"07"),UnitLine(name:"08")]
NavigationView {
ScrollViewReader {proxy in
VStack {
Spacer()
List {
ForEach(floors) { i in
Section(header: Text("Floor \(i.name)")) {
ForEach(unitlines) { u in
Text(u.name)
.padding(.trailing,200)
.contentShape(Rectangle())
.onTapGesture {
print("tapped")
presentationMode.wrappedValue.dismiss()
}
}
}
}
}
HStack {
Spacer()
Text("Flr: \(Int(sliderValue))")
.font(.title)
.padding(10)
Button {
if sliderValue>8 {
sliderValue=sliderValue-1.0
proxy.scrollTo(String(Int(sliderValue)), anchor: .topLeading)
}
else { print("slider below (\(sliderValue))") }
print(proxy)
} label: {
Image(systemName: "minus")
}
.frame(width:30, height:15)
.padding(10)
.background(Color.red)
.clipShape(Capsule())
Slider(value: $sliderValue, in: 8...42, step: 1.0, onEditingChanged: {_ in
withAnimation {
proxy.scrollTo(String(Int(sliderValue)), anchor: .topLeading)
print(String(Int(sliderValue)))
}
}
)
.background(Color.cyan)
.border(Color.blue, width: 1)
.padding(10)
Button {
if sliderValue<42 {
print(sliderValue)
sliderValue=sliderValue+1.0
print(sliderValue)
proxy.scrollTo(String(Int(sliderValue)), anchor: .topLeading)
}
} label: {
Image(systemName: "plus")
}
.frame(width:30, height:15)
.padding(10)
.background(Color.green)
.clipShape(Capsule())
Spacer()
}
.background(Color.gray)
}
}
.navigationTitle("Select Address")
}
}
}

SwiftUI: How to pass an argument from one view to the next with dynamically generated buttons?

Problem:
I am unable to force my alpha, beta, or gamma buttons to turn ON when an input parameter is passed from Landing.swift.
I do not understand why when onAppear fires in the stack, the output becomes:
gamma is the title
beta is the title
alpha is the title
gamma is the title
beta is the title
alpha is the title
Confused -> Why is this outputting 2x when the ForEach loop has only 3 elements inside?
Background:
I am trying to pass a parameter from one view (Landing.swift) to another (ContentView.swift) and then based on that parameter force the correct button (in ContentView) to trigger an ON state so it's selected. I have logic shown below in ButtonOnOff.swift that keeps track of what's selected and not.
For instance, there are 3 buttons in ContentView (alpha, beta, and gamma) and based on the selected input button choice from Landing, the respective alpha, beta, or gamma button (in ContentView) should turn ON.
I am dynamically generating these 3 buttons in ContentView and want the flexibility to extend to possibly 10 or more in the future. Hence why I'm using the ForEach in ContentView. I need some help please understanding if I'm incorrectly using EnvironmentObject/ObservedObject or something else.
Maintaining the ON/OFF logic works correctly with the code. That is, if you manually press alpha, it'll turn ON but the other two will turn OFF and so forth.
Thanks for your help in advance! :)
Testing.swift
import SwiftUI
#main
struct Testing: App {
#StateObject var buttonsEnvironmentObject = ButtonOnOff()
var body: some Scene {
WindowGroup {
Landing().environmentObject(buttonsEnvironmentObject)
}
}
}
Landing.swift
import SwiftUI
struct Landing: View {
#State private var tag:String? = nil
var body: some View {
NavigationView {
ZStack{
HStack{
NavigationLink(destination: ContentView(landingChoice:tag ?? ""), tag: tag ?? "", selection: $tag) {
EmptyView()
}
Button(action: {
self.tag = "alpha"
}) {
HStack {
Text("alpha")
}
}
Button(action: {
self.tag = "beta"
}) {
HStack {
Text("beta")
}
}
Button(action: {
self.tag = "gamma"
}) {
HStack {
Text("gamma")
}
}
}
.navigationBarHidden(true)
}
.navigationViewStyle(StackNavigationViewStyle())
}
}
}
ContentView.swift
import SwiftUI
struct ContentView: View {
var btnName:String
#EnvironmentObject var buttonEnvObj:ButtonOnOff
init(landingChoice:String){
self.btnName = landingChoice
print("\(self.btnName) is the input string")
}
var body: some View {
VStack{
Form{
Section{
ScrollView(.horizontal, showsIndicators: false) {
HStack(spacing:10) {
ForEach(0..<buttonEnvObj.buttonNames.count) { index in
BubbleButton(label: "\(buttonEnvObj.buttonNames[index])")
.padding(EdgeInsets(top: 5, leading: 5, bottom: 5, trailing: 0))
.onAppear {
print("\(buttonEnvObj.buttonNames[index]) is the title")
}
}
}
}.frame(height: 50)
}
}
}
}
}
struct BubbleButton: View{
#EnvironmentObject var buttonBrandButtons:ButtonOnOff
var label: String
var body: some View{
HStack{
Button(action: {
print("Button action")
buttonBrandButtons.changeState(buttonName: self.label)
}) {
ZStack {
VStack{
HStack {
Spacer()
Text(label)
.font(.system(size: 12,weight:.regular, design: .default))
.foregroundColor(buttonBrandButtons.buttonBrand[self.label]! ? Color.white : Color.gray)
Spacer()
}
}
.frame(height:30)
.fixedSize()
}
}
.background(buttonBrandButtons.buttonBrand[self.label]! ? Color.blue : .clear)
.cornerRadius(15)
.overlay(buttonBrandButtons.buttonBrand[self.label]! ?
RoundedRectangle(cornerRadius: 15).stroke(Color.blue,lineWidth:1) : RoundedRectangle(cornerRadius: 15).stroke(Color.gray,lineWidth:1))
.animation(.linear, value: 0.15)
}
}
}
ButtonOnOff.swift
import Foundation
class ButtonOnOff:ObservableObject{
var buttonNames = ["alpha","beta","gamma"]
#Published var buttonBrand:[String:Bool] = [
"alpha":false,
"beta":false,
"gamma":false
]
func changeState(buttonName:String) -> Void {
for (key,_) in buttonBrand{
if key == buttonName && buttonBrand[buttonName] == true{
buttonBrand[buttonName] = false
} else{
buttonBrand[key] = (key == buttonName) ? true : false
}
}
print(buttonBrand)
}
}
For a short answer just add
.onAppear(){
buttonEnvObj.changeState(buttonName: self.btnName)
}
to ContentView that will highlight the button that was selected.
As for a solution that can be expanded at will. I would suggest a single source of truth for everything and a little simplifying.
struct Landing: View {
#EnvironmentObject var buttonEnvObj:ButtonOnOff
#State private var tag:String? = nil
var body: some View {
NavigationView {
ZStack{
HStack{
NavigationLink(destination: ContentView(), tag: tag ?? "", selection: $tag) {
EmptyView()
}
//Put your buttons here
HStack{
//Use the keys of the dictionary to create the buttons
ForEach(buttonEnvObj.buttonBrand.keys.sorted(by: <), id: \.self){ key in
//Have the button set the value when pressed
Button(action: {
self.tag = key
buttonEnvObj.changeState(buttonName: key)
}) {
Text(key)
}
}
}
}
.navigationBarHidden(true)
}
.navigationViewStyle(StackNavigationViewStyle())
}
}
}
struct ContentView: View {
#EnvironmentObject var buttonEnvObj:ButtonOnOff
var body: some View {
VStack{
Form{
Section{
ScrollView(.horizontal, showsIndicators: false) {
HStack(spacing:10) {
//Change this to use the dictionary
ForEach(buttonEnvObj.buttonBrand.sorted(by: {$0.key < $1.key }), id:\.key) { key, value in
BubbleButton(key: key, value: value)
.padding(EdgeInsets(top: 5, leading: 5, bottom: 5, trailing: 0))
.onAppear {
print("\(value) is the title")
}
}
}
}.frame(height: 50)
}
}
}
}
}
struct BubbleButton: View{
#EnvironmentObject var buttonBrandButtons:ButtonOnOff
var key: String
var value: Bool
var body: some View{
HStack{
Button(action: {
print("Button action")
buttonBrandButtons.changeState(buttonName: key)
}) {
ZStack {
VStack{
HStack {
Spacer()
Text(key)
.font(.system(size: 12,weight:.regular, design: .default))
.foregroundColor(value ? Color.white : Color.gray)
Spacer()
}
}
.frame(height:30)
.fixedSize()
}
}
.background(value ? Color.blue : .clear)
.cornerRadius(15)
.overlay(value ?
RoundedRectangle(cornerRadius: 15).stroke(Color.blue,lineWidth:1) : RoundedRectangle(cornerRadius: 15).stroke(Color.gray,lineWidth:1))
.animation(.linear, value: 0.15)
}
}
}
class ButtonOnOff:ObservableObject{
//Get rid of this so you can keep the single source
//var buttonNames = ["alpha","beta","gamma"]
//When you want to add buttons just add them here it will all adjust
#Published var buttonBrand:[String:Bool] = [
"alpha":false,
"beta":false,
"gamma":false
]
func changeState(buttonName:String) -> Void {
for (key,_) in buttonBrand{
if key == buttonName && buttonBrand[buttonName] == true{
buttonBrand[buttonName] = false
} else{
buttonBrand[key] = (key == buttonName) ? true : false
}
}
print(buttonBrand)
}
}

SwiftUI Popover Size is not expanding to fit content

Here is my code
struct ContentView: View {
#State var showingPopover = false
var body: some View {
VStack {
Spacer()
Text("Hello World")
Spacer()
HStack {
Spacer()
Button {
self.showingPopover.toggle()
} label: {
Image(systemName: "plus.circle")
}
.popover(isPresented: $showingPopover) {
List(0..<100) { Text("\($0)") }
}.padding(30)
}
}
}
}
This should produce a really nice popover coming from the plus button. But all I get is a really squashed down popover.
Any idea what I am missing here? Is there a way to tell the popover to expand more (without specifying a size)?
You may use a ScrollView and ForEach instead of a List:
struct ContentView: View {
#State var showingPopover = false
var body: some View {
VStack {
Spacer()
Text("Hello World")
Spacer()
HStack {
Spacer()
Button(action: {
self.showingPopover.toggle()
}) {
Image(systemName: "plus.circle")
}
.padding(30)
}
}
// can be attached to the button as well (as in the question)
.popover(isPresented: $showingPopover,
attachmentAnchor: .point(.bottomTrailing),
arrowEdge: .bottom) {
ScrollView(.vertical, showsIndicators: false) {
ForEach(0 ..< 100) {
Text("\($0)")
}
}
}
}
}
You can provide a custom frame for the List. Also, don't forget to embed List inside a ScrollView if you want it to scroll.
ScrollView {
List(0..<100) {
Text("\($0)")
}
.frame(width: 100, height: 250)
}

SwiftUI TextField acts disabled in VStack inside ZStack (simulating an Alert with a TextField)

I need to make an Alert in SwiftUI that has an editable TextField in it. Currently, this isn't supported by SwiftUI (as of Xcode 11.3), so I'm looking for a work-around.
I know I can implement by wrapping the normal UIKit bits in a UIHostingController, but really want to stick with an all-SwiftUI implementation.
I've got two VStacks in a ZStack, with the front one (the one with the TextView) being hidden and disabled until until you tap the button. Take a look at this:
import SwiftUI
struct ContentView: View {
#State var isShowingEditField = false
#State var text: String = "12345"
var body: some View {
ZStack {
VStack {
Text("Value is \(self.text)")
Button(action: {
print("button")
self.isShowingEditField = true
}) {
Text("Tap To Test")
}
}
.disabled(self.isShowingEditField)
.opacity(self.isShowingEditField ? 0.25 : 1.00)
VStack(alignment: .center) {
Text("Edit the text")
TextField("", text: self.$text)
.multilineTextAlignment(.center)
.lineLimit(1)
Divider()
HStack {
Button(action: {
withAnimation {
self.isShowingEditField = false
print("completed... value is \(self.text)")
}
}) {
Text("OK")
}
}
}
.padding()
.background(Color.white)
.shadow(radius: CGFloat(1.0))
.disabled(!self.isShowingEditField)
.opacity(self.isShowingEditField ? 1.0 : 0.0)
}
}
}
This seems like it should work to me. Switching between the two VStacks works well, but the TextField is not editable.
It acts like it's disabled, but it's not. Explicitly .disabled(false) to the TextField doesn't help. Also, it should already be enabled anyway since 1) that's the default, 2) the VStack it's in is specifically being set as enabled, and 3) The OK button works normally.
Ideas/workarounds?
Thanks!
You need to force the TextField updating with some methods. Like the following:
TextField("", text: self.$text)
.multilineTextAlignment(.center)
.lineLimit(1)
.id(self.isShowingEditField)
That is really ridiculous, but the problem disappears if you comment just one line of code:
//.shadow(radius: CGFloat(1.0))
I commented it and everything works. I think you need to use ZStack somewhere in your custom alert view to avoid this.. hm, bug, maybe?
update
try some experiments. If you leave just this code in that View:
struct CustomAlertWithTextField: View {
#State var isShowingEditField = false
#State var text: String = "12345"
var body: some View {
TextField("", text: $text)
.padding()
.shadow(radius: CGFloat(1.0))
}
}
it would not work again. only if you comment .padding() or .shadow(...)
BUT if you relaunch Xcode - this code begin to work (which made me crazy). Tried it at Xcode Version 11.2 (11B52)
update 2 the working code version:
struct CustomAlertWithTextField: View {
#State var isShowingEditField = false
#State var text: String = "12345"
var body: some View {
ZStack {
VStack {
Text("Value is \(self.text)")
Button(action: {
print("button")
self.isShowingEditField = true
}) {
Text("Tap To Test")
}
}
.disabled(self.isShowingEditField)
.opacity(self.isShowingEditField ? 0.25 : 1.00)
ZStack {
Rectangle()
.fill(Color.white)
.frame(width: 300, height: 100)
.shadow(radius: 1) // moved shadow here, so it doesn't affect TextField now
VStack(alignment: .center) {
Text("Edit the text")
TextField("", text: self.$text)
.multilineTextAlignment(.center)
.lineLimit(1)
.frame(width: 298)
Divider().frame(width: 300)
HStack {
Button(action: {
withAnimation {
self.isShowingEditField = false
print("completed... value is \(self.text)")
}
}) {
Text("OK")
}
}
}
}
.padding()
.background(Color.white)
.disabled(!self.isShowingEditField)
.opacity(self.isShowingEditField ? 1.0 : 0.0)
}
}
}
after some research i solved this problem by adding .clipped() to the VStack.
For your problem, it would look like this:
VStack(alignment: .center) {
Text("Edit the text")
TextField("", text: self.$text)
.multilineTextAlignment(.center)
.lineLimit(1)
Divider()
HStack {
Button(action: {
withAnimation {
self.isShowingEditField = false
print("completed... value is \(self.text)")
}
}) {
Text("OK")
}
}
}
.padding()
.clipped() // <- here
.background(Color.white)
.shadow(radius: CGFloat(1.0))
.disabled(!self.isShowingEditField)
.opacity(self.isShowingEditField ? 1.0 : 0.0)