Going to another View from SwiftUI to UIKit? - swift

I use uihostingcontroller to load a SwiftUI view in a UIKit View.
in my SwiftUI view, I create some horizontal ScrollViews with some stuff in them.
I need to be able to click/tap on these elements and go to another view in my UIKit.
Is this possible?
I found this but this shows to "reload" the UIKit into the SwiftUI view which is not what I want to do and I don't think this is the correct way of doing this anyway:
Is there any way to change view from swiftUI to UIKit?
This is my SwiftUI code:
import SwiftUI
struct videosContentView: View {
var body: some View {
ScrollView{
ForEach(0..<2) {_ in
Section(header: Text("Important tasks")) {
VStack{
ScrollView(.horizontal){
HStack(spacing: 20) {
ForEach(0..<10) {
Text("Item \($0)")
.font(.headline)
.frame(width: 160, height: 200)
.background(Color.gray)
/*.padding()*/
.addBorder(Color.white, width: 1, cornerRadius: 10)
/*.overlay(
RoundedRectangle(cornerRadius: 16)
.stroke(Color.blue, lineWidth: 4)
)*/
}
}
}
}
}
}
}
}
}
struct videosContentView_Previews: PreviewProvider {
static var previews: some View {
videosContentView()
}
}
extension View {
public func addBorder<S>(_ content: S, width: CGFloat = 1, cornerRadius: CGFloat) -> some View where S : ShapeStyle {
let roundedRect = RoundedRectangle(cornerRadius: cornerRadius)
return clipShape(roundedRect)
.overlay(roundedRect.strokeBorder(content, lineWidth: width))
}
}
EDIT:
Based on suggestion in the comments, I tried this but this doesn't work:
Button(action: {
let secondViewController = self.storyboard.instantiateViewControllerWithIdentifier("home") as home
self.navigationController.pushViewController(secondViewController, animated: true)
}) {
Text("Dismiss me")
.font(.headline)
.frame(width: 160, height: 200)
.background(Color.gray)
.addBorder(Color.white, width: 1, cornerRadius: 10)
}

struct YourSwiftUIView: View {
#State var push = false
var body: some View {
if push {
YourUIViewController()
}else {
//your content
Button(action: {
withAnimation() {
push.toggle()
}
}) {
Text("Dismiss me")
.font(.headline)
.frame(width: 160, height: 200)
.background(Color.gray)
}
}
}
}
struct YourUIViewController: UIViewControllerRepresentable {
typealias UIViewControllerType = UIViewController
func makeUIViewController(context: UIViewControllerRepresentableContext<YourUIViewController>) -> UIViewController {
let yourUIViewController = UIViewController() //your UIViewController
return yourUIViewController
}
func updateUIViewController(_ uiViewController: UIViewController, context: UIViewControllerRepresentableContext<YourUIViewController>) {
}
}
this will change from the swiftuiview to the UIViewController.

Related

How to hide a swiftUI view by touching anywhere outside of it

I have a view that call an alert that is another smaller view, whenever the second View is shown, I want to hide it when clicking outside of it.
How can I do that?
struct AlertView: View{
let screenSize = UIScreen.main.bounds
#Binding var alertIsShown: Bool
var body: some View{
VStack{
Button("Cancel") {
self.alertIsShown=false
}
}.padding()
.frame(width: screenSize.width * 0.85, height: screenSize.height * 0.6)
.background(Color(red: 0.4627, green: 0.8392, blue: 1.0))
.clipShape(RoundedRectangle(cornerRadius: 20.0, style: .continuous))
.offset(y: alertIsShown ? 0 : screenSize.height)
.animation(.spring())
.shadow(color: Color(.white), radius: 6, x: -9, y: -0)
}
}
}
For the main view that call the alert:
struct MainView: View {
#State private var alertIsShown = false
#State var liveOrdersList: [String] = ["item-1", "item-2"]
var body: some View {
VStack{
NavigationView{
List{
ForEach(liveOrdersList, id: \.self) { order in
HStack {
VStack(alignment: .leading){
Text("\(order.totalPrice)")
}
Spacer()
Button("add") {
withAnimation(.linear(duration: 0.3)) {
alertIsShown.toggle()
}
}
}
}
}
}
}
}
if alertIsShown{ //here I call the aler
AlertView(alertIsShown: $alertIsShown)
}
}
The list of buttons call the alert view.
How can I hide it when tapping outside of it?
You could try this approach, using .simultaneousGesture(...), as shown in this example code, to hide the AlertView by touching anywhere outside of it.
struct ContentView: View {
var body: some View {
MainView()
}
}
struct MainView: View {
#State var alertIsShown = false
// for testing
#State var liveOrdersList: [String] = ["item-1", "item-2", "item-3", "item-4", "item-5"]
var body: some View {
NavigationView {
VStack {
List {
ForEach(liveOrdersList, id: \.self) { order in
HStack {
VStack(alignment: .leading) {
Text("\(order)")
}
Spacer()
Button("add") {
withAnimation(.linear(duration: 0.3)) {
alertIsShown.toggle()
}
}
}
}
}
// -- here
.simultaneousGesture(alertIsShown ? TapGesture().onEnded {
alertIsShown = false
} : nil)
if alertIsShown {
AlertView(alertIsShown: $alertIsShown)
}
}
}
}
}

SwiftUI View method called but output missing

I have the View AlphabetLetterDetail:
import SwiftUI
struct AlphabetLetterDetail: View {
var alphabetLetter: AlphabetLetter
var letterAnimView : LetterAnimationView
var body: some View {
VStack {
Button(action:
animateLetter
) {
Image(uiImage: UIImage(named: "alpha_be_1")!)
.resizable()
.scaledToFit()
.frame(width: 60.0, height: 120.0)
}
letterAnimView
}.navigationBarTitle(Text(verbatim: alphabetLetter.name), displayMode: .inline)
}
func animateLetter(){
print("tapped")
letterAnimView.timerWrite()
}
}
containing the View letterAnimView of Type LetterAnimationView:
import SwiftUI
struct LetterAnimationView: View {
#State var Robot : String = ""
let LETTER =
["alpha_be_1_81",
"alpha_be_1_82",
"alpha_be_1_83",
"alpha_be_1_84",
"alpha_be_1_85",
"alpha_be_1_86",
"alpha_be_1_87",
"alpha_be_1_88",
"alpha_be_1_89",
"alpha_be_1_90",
"alpha_be_1"]
var body: some View {
VStack(alignment:.center){
Image(Robot)
.resizable()
.frame(width: 80, height: 160, alignment: .center)
.onAppear(perform: timerWrite)
}
}
func timerWrite(){
var index = 0
let _ = Timer.scheduledTimer(withTimeInterval: 0.08, repeats: true) {(Timer) in
Robot = LETTER[index]
print("one frame")
index += 1
if (index > LETTER.count - 1){
Timer.invalidate()
}
}
}
}
This gives me a fine animation, as coded in func timerWrite() and performed by .onAppear(perform: timerWrite).
After commenting //.onAppear(perform: timerWrite) I try animating by clicking
Button(action: animateLetter)
but nothing happens.
Maybe I got two different instances of letterAnimView, if so why?
Can anybody of you competent guys intentify my mistake?
Regards - Klaus
You don't want to store Views, they are structs so they are copied. Instead, create an ObservableObject to encapsulate this functionality.
I created RobotModel here with other minor changes:
class RobotModel: ObservableObject {
private static let atlas = [
"alpha_be_1_81",
"alpha_be_1_82",
"alpha_be_1_83",
"alpha_be_1_84",
"alpha_be_1_85",
"alpha_be_1_86",
"alpha_be_1_87",
"alpha_be_1_88",
"alpha_be_1_89",
"alpha_be_1_90",
"alpha_be_1"
]
#Published private(set) var imageName: String
init() {
imageName = Self.atlas.last!
}
func timerWrite() {
var index = 0
let _ = Timer.scheduledTimer(withTimeInterval: 0.08, repeats: true) { [weak self] timer in
guard let self = self else { return }
self.imageName = Self.atlas[index]
print("one frame")
index += 1
if index > Self.atlas.count - 1 {
timer.invalidate()
}
}
}
}
struct AlphabetLetterDetail: View {
#StateObject private var robot = RobotModel()
let alphabetLetter: AlphabetLetter
var body: some View {
VStack {
Button(action: animateLetter) {
Image(uiImage: UIImage(named: "alpha_be_1")!)
.resizable()
.scaledToFit()
.frame(width: 60.0, height: 120.0)
}
LetterAnimationView(robot: robot)
}.navigationBarTitle(Text(verbatim: alphabetLetter.name), displayMode: .inline)
}
func animateLetter() {
print("tapped")
robot.timerWrite()
}
}
struct LetterAnimationView: View {
#ObservedObject var robot: RobotModel
var body: some View {
VStack(alignment:.center){
Image(robot.imageName)
.resizable()
.frame(width: 80, height: 160, alignment: .center)
.onAppear(perform: robot.timerWrite)
}
}
}

Music NowPlaying above TabView in SwiftUI

I'm new in SwiftUI, I have an app that plays some audios from URLs in UIKit and I'm upgrading it to SwiftUI
I'm following this tutorial to have a bottom "now playing bar"
https://itnext.io/add-a-now-playing-bar-with-swiftui-to-your-app-d515b03f05e3
The problem is: my bar is below the tabView, but I want it above the tabView
I don't know how to solve this. Maybe the tutorial is outdated because of an old SwiftUI version?
This is what I'm doing:
import SwiftUI
#main
struct MyApp: App {
#State var playerOffset: CGFloat = 0
var body: some Scene {
WindowGroup {
TabView {
VideosView()
.tabItem { Image(systemName: "film").accentColor(.black)
Text("Videos")}
AudiosView()
.tabItem { Image(systemName: "headphones").accentColor(.black)
Text("Audios")}
}
NowPlayingBar(content: ListenNowView()).tag(0).tabItem { Label("Listen Now", systemImage: "play.circle.fill") }
}
}
}
struct Blur: UIViewRepresentable {
var style: UIBlurEffect.Style = .systemChromeMaterial
func makeUIView(context: Context) -> UIVisualEffectView {
return UIVisualEffectView(effect: UIBlurEffect(style: style))
}
func updateUIView(_ uiView: UIVisualEffectView, context: Context) {
uiView.effect = UIBlurEffect(style: style)
}
}
struct NowPlayingBar<Content: View>: View {
var content: Content
#ViewBuilder var body: some View {
ZStack(alignment: .bottom) {
//content
ZStack {
Rectangle().foregroundColor(Color.white.opacity(0.0)).frame(width: UIScreen.main.bounds.size.width, height: 65).background(Blur())
HStack {
Button(action: {}) {
HStack {
Image("cover").resizable().frame(width: 45, height: 45).shadow(radius: 6, x: 0, y: 3).padding(.leading)
Text("Shake It Off").padding(.leading, 10)
Spacer()
}
}.buttonStyle(PlainButtonStyle())
Button(action: {}) {
Image(systemName: "play.fill").font(.title3)
}.buttonStyle(PlainButtonStyle()).padding(.horizontal)
Button(action: {}) {
Image(systemName: "forward.fill").font(.title3)
}.buttonStyle(PlainButtonStyle()).padding(.trailing, 30)
}
}
}
}
}
struct ListenNowView: View {
#State private var showMediaPlayer = false
var body: some View {
Button(action: {
self.showMediaPlayer.toggle()
}) {
HStack {
Image("Cover").resizable().frame(width: 45, height: 45).shadow(radius: 6, x: 0, y: 3).padding(.leading)
Text("Shake It Off").padding(.leading, 10)
Spacer()
}
}.buttonStyle(PlainButtonStyle()).fullScreenCover(isPresented: $showMediaPlayer) {
}
}
}
Inside your window group there is a mistake. The tutorial says "Now we only need to wrap our individual views in the NowPlayingBar(content: _) to prepare for this feature."
Doing this way will work :
TabView {
NowPlayingBar(content: VideosView())
.tabItem { Image(systemName: "film").accentColor(.black)
Text("Videos")}.tag(0)
NowPlayingBar(content: AudiosView())
.tabItem { Image(systemName: "headphones").accentColor(.black)
Text("Audios")}.tag(1)
NowPlayingBar(content: ListenNowView())
.tabItem { Label("Listen Now", systemImage: "play.circle.fill") }
.tag(2)
}

How do I implement #EnvironmentObject for this custom full-screen modal setup?

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.

SwiftUI set position to center of different view

I have two different views, one red rect and one black rect that is always positioned on the bottom of the screen. When I click the red rect it should position itself inside the other rect.
Currently the red rect is positioned statically: .position(x: self.tap ? 210 : 50, y: self.tap ? 777 : 50). Is there a way to replace the 210 and 777 dynamically to the position of the black rects center position?
I know that I can use the GeometryReader to get the views size, but how do I use that size to position a different view? Would this even be the right way?
struct ContentView: View {
#State private var tap = false
var body: some View {
ZStack {
VStack {
Spacer()
RoundedRectangle(cornerRadius: 10)
.frame(maxWidth: .infinity, maxHeight: 50, alignment: .center)
}
.padding()
VStack {
ZStack {
Rectangle()
.foregroundColor(.red)
Text("Click me")
.fontWeight(.light)
.foregroundColor(.white)
}
.frame(width: 50, height: 50)
.position(x: self.tap ? 210 : 50, y: self.tap ? 777 : 50)
.onTapGesture {
withAnimation {
self.tap.toggle()
}
}
}
}
}
}
First define some structure where to store .center position of some View
struct PositionData: Identifiable {
let id: Int
let center: Anchor<CGPoint>
}
The build-in mechanism to save such data and expose them to parent View is to set / read (or react) on values which conforms to PreferenceKey protocol.
struct Positions: PreferenceKey {
static var defaultValue: [PositionData] = []
static func reduce(value: inout [PositionData], nextValue: () -> [PositionData]) {
value.append(contentsOf: nextValue())
}
}
To be able to read the center positions of View we can use well known and widely discussed GeometryReader. I define my PositionReader as a View and here we can simply save its center position in our preferences for further usage. There is no need to translate the center to different coordinate system. To identify the View its tag value must be saved as well
struct PositionReader: View {
let tag: Int
var body: some View {
// we don't need geometry reader at all
//GeometryReader { proxy in
Color.clear.anchorPreference(key: Positions.self, value: .center) { (anchor) in
[PositionData(id: self.tag, center: anchor)]
}
//}
}
}
To demonstrate how to use all this together see next simple application (copy - paste - run)
import SwiftUI
struct PositionData: Identifiable {
let id: Int
let center: Anchor<CGPoint>
}
struct Positions: PreferenceKey {
static var defaultValue: [PositionData] = []
static func reduce(value: inout [PositionData], nextValue: () -> [PositionData]) {
value.append(contentsOf: nextValue())
}
}
struct PositionReader: View {
let tag: Int
var body: some View {
Color.clear.anchorPreference(key: Positions.self, value: .center) { (anchor) in
[PositionData(id: self.tag, center: anchor)]
}
}
}
struct ContentView: View {
#State var tag = 0
var body: some View {
ZStack {
VStack {
Color.green.background(PositionReader(tag: 0))
.onTapGesture {
self.tag = 0
}
HStack {
Rectangle()
.foregroundColor(Color.red)
.aspectRatio(1, contentMode: .fit)
.background(PositionReader(tag: 1))
.onTapGesture {
self.tag = 1
}
Rectangle()
.foregroundColor(Color.red)
.aspectRatio(1, contentMode: .fit)
.background(PositionReader(tag: 2))
.onTapGesture {
self.tag = 2
}
Rectangle()
.foregroundColor(Color.red)
.aspectRatio(1, contentMode: .fit)
.background(PositionReader(tag: 3))
.onTapGesture {
self.tag = 3
}
}
}
}.overlayPreferenceValue(Positions.self) { preferences in
GeometryReader { proxy in
Rectangle().frame(width: 50, height: 50).position( self.getPosition(proxy: proxy, tag: self.tag, preferences: preferences))
}
}
}
func getPosition(proxy: GeometryProxy, tag: Int, preferences: [PositionData])->CGPoint {
let p = preferences.filter({ (p) -> Bool in
p.id == tag
})[0]
return proxy[p.center]
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
The code is almost self explanatory, we use .background(PositionReader(tag:)) to save the center position of View (this could be avoided by applying .anchorPreference directly on the View) and
.overlayPreferenceValue(Positions.self) { preferences in
GeometryReader { proxy in
Rectangle().frame(width: 50, height: 50).position( self.getPosition(proxy: proxy, tag: self.tag, preferences: preferences))
}
}
is used to create small black rectangle which will position itself at center of other Views. Just tap anywhere in green or red rectangles, and the black one will move immediately :-)
Here is view of this sample application running.
Here is possible approach (with a bit simplified your initial snapshot and added some convenient View extension).
Tested with Xcode 11.2 / iOS 13.2
extension View {
func rectReader(_ binding: Binding<CGRect>, in space: CoordinateSpace) -> some View {
self.background(GeometryReader { (geometry) -> AnyView in
let rect = geometry.frame(in: space)
DispatchQueue.main.async {
binding.wrappedValue = rect
}
return AnyView(Rectangle().fill(Color.clear))
})
}
}
struct ContentView: View {
#State private var tap = false
#State private var bottomRect: CGRect = .zero
var body: some View {
ZStack(alignment: .bottom) {
RoundedRectangle(cornerRadius: 10)
.frame(maxWidth: .infinity, maxHeight: 50, alignment: .center)
.padding()
.rectReader($bottomRect, in: .named("board"))
Rectangle()
.foregroundColor(.red)
.overlay(Text("Click me")
.fontWeight(.light)
.foregroundColor(.white)
)
.frame(width: 50, height: 50)
.position(x: self.tap ? bottomRect.midX : 50,
y: self.tap ? bottomRect.midY : 50)
.onTapGesture {
withAnimation {
self.tap.toggle()
}
}
}.coordinateSpace(name: "board")
}
}