Why doesn't UIVisualEffectView work in SwiftUI context menus? - ios

I have a relatively simple view, and I am trying to get UIVisualEffectView to work when used within a context menu.
struct ContentView: View {
var body: some View {
ZStack(alignment: .bottomLeading) {
Image("Flower")
.resizable()
.frame(width: 200, height: 200)
VStack {
Text("Line 1")
Text("Line 2")
}
.frame(width: 200, height: 50)
.background(BlurView())
}
.contextMenu(ContextMenu(menuItems: {
Text("Menu Item 1")
}))
}
}
struct BlurView: UIViewRepresentable {
var style: UIBlurEffect.Style = .systemMaterial
func makeUIView(context: Context) -> UIVisualEffectView {
return UIVisualEffectView(effect: UIBlurEffect(style: style))
}
func updateUIView(_ uiView: UIVisualEffectView, context: Context) {
uiView.effect = UIBlurEffect(style: style)
}
}
When the view loads it works great, but when the context menu is activated the whole blur just disappears.
Hopefully there's a workaround or I'll just have to use a completely different overlay until this is fixed.

This is the way how the contextMenu interferes with the underlying view.
If you don't want this behaviour, you can attach the contextMenu to an invisible overlay, so the underlying view will remain untouched:
struct ContentView: View {
var body: some View {
ZStack(alignment: .bottomLeading) {
Image("testImage")
.resizable()
.frame(width: 200, height: 200)
VStack {
Text("Line 1")
Text("Line 2")
}
.frame(width: 200, height: 50)
.background(BlurView())
}
.overlay(
Color.clear
.contentShape(Rectangle())
.contextMenu(ContextMenu(menuItems: {
Text("Menu Item 1")
}))
)
}
}

Related

Clear background for DatePicker and Image with SwiftUI

I want the image to not have its own background.
But I don’t understand where to set .background or any other way so that it doesn’t stand out
struct CustomDatePicker: View {
#State var date = Date()
let finalDate = Date.now.addingTimeInterval(604800)
var body: some View {
VStack {
ZStack {
DatePicker("label", selection: $date, in: Date.now...finalDate, displayedComponents: .date)
.datePickerStyle(CompactDatePickerStyle())
.labelsHidden()
Image(systemName: "calendar")
.font(.system(size: 21))
.foregroundColor(titleFieldColor)
.userInteractionDisabled()
}
.background(.clear)
}
}
}
struct NoHitTesting: ViewModifier {
func body(content: Content) -> some View {
SwiftUIWrapper { content }.allowsHitTesting(false)
}
}
struct SwiftUIWrapper<T: View>: UIViewControllerRepresentable {
let content: () -> T
func makeUIViewController(context: Context) -> UIHostingController<T> {
UIHostingController(rootView: content())
}
func updateUIViewController(_ uiViewController: UIHostingController<T>, context: Context) {}
}
extension View {
func userInteractionDisabled() -> some View {
self.modifier(NoHitTesting())
}
}
And here full string.
var body: some View {
HStack {
Text(title.count > 0 ? title : nameOfCategory.localized(LocalizationService.shared.language))
.frame(width: 200, height: 40, alignment: .leading)
.font(.system(size: 16))
.foregroundColor(titleFieldColor)
CustomDatePicker()
.background(backgroundFieldColor.opacity(1))
.frame(width: 30, height: 30)
}
.frame(width: 280, height: 40)
.background(backgroundFieldColor)
.clipShape(RoundedRectangle(cornerRadius: 25))
}
I have tried many different options but none of the options work for this line:
I can't reduce the frame of this CustomDatePicker
I made .background the same color as view, did oppacity - 1, tried background(.clear)
This white zone doesn't change at all
How else can you try to fix this?

Swiftui: How to snapshot a view then share?

I found this code for taking a snapshot of a view in SwiftUI, and also found this gist for how to bring up UIActivityController in SwiftUI. It works ok but the biggest issue I am having is when you tap share the UIActivityController is blank, if you tap share again it will work as expected but I can't figure out why it doesn't work the first time? If I change to a static image or text to share it works as expected? Any thoughts?
import SwiftUI
//construct enum to decide which sheet to present:
enum ActiveSheet: String, Identifiable { // <--- note that it's now Identifiable
case photoLibrary, shareSheet
var id: String {
return self.rawValue
}
}
struct ShareHomeView: View {
#State private var shareCardAsImage: UIImage? = nil
#State var activeSheet: ActiveSheet? = nil // <--- now an optional property
var shareCard: some View {
ZStack {
VStack {
Spacer()
LinearGradient(
gradient: Gradient(colors: [.black, .red]),
startPoint: .topLeading,
endPoint: .bottomTrailing
)
.cornerRadius(10.0)
.padding(.horizontal)
Spacer()
}
SubView()
.padding(.horizontal)
VStack {
HStack {
HStack(alignment: .center) {
Image(systemName: "gamecontroller")
.resizable()
.aspectRatio(contentMode: .fit)
.frame(height: 40)
.padding(.leading)
VStack(alignment: .leading, spacing: 3) {
Text("My App")
.foregroundColor(.white)
.font(.headline)
.fontWeight(.bold)
Text("Wed 30 Mar 22")
.foregroundColor(.white)
.font(.headline)
// .fontWeight(.bold)
}
}
Spacer()
}
.padding([.leading, .top])
Spacer()
}
} //End of ZStack
.frame(height: 350)
}
var body: some View {
NavigationView {
VStack {
HStack {
Spacer()
Button {
self.activeSheet = .photoLibrary
} label: {
Image(systemName: "photo")
.resizable()
.scaledToFit()
.frame(height: 40)
}
.padding(.trailing)
}
//GeometryReader { geometry in
shareCard
// } //End of GeometryReader
Button(action: {
shareCardAsImage = shareCard.asImage()
self.activeSheet = .shareSheet
}) {
HStack {
Image(systemName: "square.and.arrow.up")
.font(.system(size: 20))
Text("Share")
.font(.headline)
}
.frame(minWidth: 0, maxWidth: .infinity, minHeight: 50, maxHeight: 50)
.background(Color.blue)
.foregroundColor(.white)
.cornerRadius(20)
}
.padding(.horizontal)
} //End of Master VStack
//sheet choosing view to display based on selected enum value:
.sheet(item: $activeSheet) { sheet in // <--- sheet is of type ActiveSheet and lets you present the appropriate sheet based on which is active
switch sheet {
case .photoLibrary:
Text("TODO")
case .shareSheet:
if let unwrappedImage = shareCardAsImage {
ShareSheet(photo: unwrappedImage)
}
}
}
//Needed to Wrap in a Navigation View and hide title so that dark mode would work, otherwise this sheet was always in the iPhone's light or dark mode
.navigationBarHidden(true)
.navigationTitle("")
}
}
}
struct RecoveryShareHomeView_Previews: PreviewProvider {
static var previews: some View {
ShareHomeView().preferredColorScheme(.dark)
ShareHomeView().preferredColorScheme(.light)
}
}
extension View {
func asImage() -> UIImage {
let controller = UIHostingController(rootView: self)
// locate far out of screen
controller.view.frame = CGRect(x: 0, y: CGFloat(Int.max), width: 1, height: 1)
UIApplication.shared.windows.first!.rootViewController?.view.addSubview(controller.view)
let size = controller.sizeThatFits(in: UIScreen.main.bounds.size)
controller.view.bounds = CGRect(origin: .zero, size: size)
controller.view.sizeToFit()
let image = controller.view.asImage()
controller.view.removeFromSuperview()
return image
}
}
extension UIView {
func asImage() -> UIImage {
let renderer = UIGraphicsImageRenderer(bounds: bounds)
return renderer.image { rendererContext in
// [!!] Uncomment to clip resulting image
// rendererContext.cgContext.addPath(
// UIBezierPath(roundedRect: bounds, cornerRadius: 20).cgPath)
// rendererContext.cgContext.clip()
// As commented by #MaxIsom below in some cases might be needed
// to make this asynchronously, so uncomment below DispatchQueue
// if you'd same met crash
// DispatchQueue.main.async {
layer.render(in: rendererContext.cgContext)
// }
}
}
}
import LinkPresentation
//This code is from https://gist.github.com/tsuzukihashi/d08fce005a8d892741f4cf965533bd56
struct ShareSheet: UIViewControllerRepresentable {
let photo: UIImage
func makeUIViewController(context: Context) -> UIActivityViewController {
//let text = ""
//let itemSource = ShareActivityItemSource(shareText: text, shareImage: photo)
let activityItems: [Any] = [photo]
let controller = UIActivityViewController(
activityItems: activityItems,
applicationActivities: nil)
return controller
}
func updateUIViewController(_ vc: UIActivityViewController, context: Context) {
}
}
struct SubView: View {
var body: some View {
HStack {
Image(systemName: "star")
Text("Test View")
Image(systemName: "star")
}
}
}
Add [shareCardAsImage] so that the current value is captured inside sheet:
.sheet(item: $activeSheet) { [shareCardAsImage] sheet in
This is necessary because your item doesn't capture it explicitly, which is generally how item is used. You could also solve it by adding an associated value on your ActiveSheet that stores the image in item.

Is there a way to increase the tappable area of a Picker in SwiftUI?

I have created a custom picker that is larger than the native SwiftUI picker. This picker is being used on an iPad which is why I need it larger than usual. When I use the picker, I can't tap on the padding portions. The picker is only opened when I tap directly in the horizontal center of my picker. I have read about using a .frame() modifier to change the tappable area of things like buttons, but that does not seem to work here when I try to add a frame modifier to the base Picker itself. Here is an image of the additional area (in orange) I would like to make tappable
And here is my code:
import SwiftUI
struct CustomPickerStyle: ViewModifier {
var labelText: String
var width: CGFloat
func body(content: Content) -> some View {
Menu {
content
} label: {
HStack {
if let labelText = labelText {
Text(labelText)
.font(.title2)
.fontWeight(.bold)
Spacer()
Image(systemName: "triangle.fill")
.resizable()
.frame(width: 12, height: 8)
.rotationEffect(.degrees(180))
}
}
}
.frame(maxWidth: width, alignment: .leading)
.padding()
.background(.white)
.overlay(
RoundedRectangle(cornerRadius: 3)
.stroke(.gray, lineWidth: 2)
)
}
}
extension View {
func customPickerStyle(labelText: String, width: CGFloat) -> some View {
self.modifier(CustomPickerStyle(labelText: labelText, width: width))
}
}
struct CustomPicker: View {
enum Flavor: String, CaseIterable, Identifiable {
case chocolate, vanilla, strawberry
var id: Self { self }
}
#State private var selectedFlavor: Flavor = .chocolate
var body: some View {
Picker("Flavor", selection: $selectedFlavor) {
Text("Chocolate").tag(Flavor.chocolate)
Text("Vanilla").tag(Flavor.vanilla)
Text("Strawberry").tag(Flavor.strawberry)
}
.customPickerStyle(labelText: selectedFlavor.rawValue, width: 200)
}
}
struct SwiftUIView_Previews: PreviewProvider {
static var previews: some View {
CustomPicker()
}
}
Just move your padding and background stylings directly inside the label:
struct CustomPickerStyle: ViewModifier {
var labelText: String
var width: CGFloat
func body(content: Content) -> some View {
Menu {
content
} label: {
HStack {
if let labelText = labelText {
Text(labelText)
.font(.title2)
.fontWeight(.bold)
Spacer()
Image(systemName: "triangle.fill")
.resizable()
.frame(width: 12, height: 8)
.rotationEffect(.degrees(180))
}
}
.frame(maxWidth: width, alignment: .leading)
.padding()
.background(.white)
.overlay(
RoundedRectangle(cornerRadius: 3)
.stroke(.gray, lineWidth: 2)
)
}
}
}

How to clip a view while using a SwiftUI .move transition / animation

I'm trying to animate in a view and make it appear as if it's a sort of drawer opening from another view. This is all fine except if the first view is not opaque. It appears that you can see the animating view the moment it begins animating. Is there a way to clip this so it appears that the view is growing from the top of the bottom view?
Even without opacity this is an issue if where you're animating in from isn't a covered (demoed in second gif)
Sample Code:
struct ContentView: View {
#State private var showingSecondView: Bool = false
var body: some View {
VStack(spacing: 0) {
Spacer()
if showingSecondView {
ZStack {
Color.green.opacity(0.25)
Text("Second View")
}
.frame(width: 300, height: 300)
.transition(.move(edge: .bottom))
}
ZStack {
Color.black.opacity(1)
Text("First View")
}
.frame(width: 300, height: 300)
Button("Animate In / Out") {
showingSecondView.toggle()
}
.padding()
}
.animation(.easeInOut, value: showingSecondView)
}
}
It is possible to do by clipping exact container of 'drawer'. Here is a demo of possible approach.
Tested with Xcode 13.2 / iOS 15.2 (Simulator slow animation is ON for better demo)
var body: some View {
VStack(spacing: 0) {
Spacer()
VStack {
if showingSecondView {
ZStack {
Color.green.opacity(0.25)
Text("Second View")
}
.transition(.move(edge: .bottom))
} else {
Color.clear // << replacement for transition visibility
}
}
.frame(width: 300, height: 300)
.animation(.easeInOut, value: showingSecondView) // << animate drawer !!
.clipped() // << clip drawer area
ZStack {
Color.black.opacity(0.2)
Text("First View")
}
.frame(width: 300, height: 300)
Button("Animate In / Out") {
showingSecondView.toggle()
}
.padding()
}
}
Here a way for you:
struct ContentView: View {
#State private var isSecondViewPresented: Bool = false
var body: some View {
VStack(spacing: 0) {
Spacer()
ZStack {
Color.green.opacity(0.25).cornerRadius(20)
Text("Second View")
}
.frame(width: 300, height: 300)
.offset(y: isSecondViewPresented ? 0 : 300)
.clipShape(RoundedRectangle(cornerRadius: 20))
ZStack {
Color.black.opacity(0.1).cornerRadius(20)
Text("First View")
}
.frame(width: 300, height: 150)
Button("Animate In / Out") {
isSecondViewPresented.toggle()
}
.padding()
}
.animation(.easeInOut, value: isSecondViewPresented)
}
}

How to show Profile Icon next to Large Navigation Bar Title in SwiftUI?

I am developing an App that supports multiple Profiles. I really like the way Apple displays the Profile Icon next to the Large Navigation Bar Title in all their Apps. See the Screenshot below:
My Question is the following:
Is it possible to achieve this in SwiftUI? And if so, how?
If it's not possible in pure SwiftUI, how can I achieve it including UIKit Code?
Thanks for your help.
I solved this by using SwiftUI-Introspect, to "Introspect underlying UIKit components from SwiftUI".
Here is an example of a view:
struct ContentView: View {
#State private var lastHostingView: UIView!
var body: some View {
NavigationView {
ScrollView {
ForEach(1 ... 50, id: \.self) { index in
Text("Index: \(index)")
}
.frame(maxWidth: .infinity)
}
.navigationTitle("Large title")
.introspectNavigationController { navController in
let bar = navController.navigationBar
let hosting = UIHostingController(rootView: BarContent())
guard let hostingView = hosting.view else { return }
// bar.addSubview(hostingView) // <--- OPTION 1
// bar.subviews.first(where: \.clipsToBounds)?.addSubview(hostingView) // <--- OPTION 2
hostingView.backgroundColor = .clear
lastHostingView?.removeFromSuperview()
lastHostingView = hostingView
hostingView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
hostingView.trailingAnchor.constraint(equalTo: bar.trailingAnchor),
hostingView.bottomAnchor.constraint(equalTo: bar.bottomAnchor, constant: -8)
])
}
}
}
}
Bar content & profile picture views:
struct BarContent: View {
var body: some View {
Button {
print("Profile tapped")
} label: {
ProfilePicture()
}
}
}
struct ProfilePicture: View {
var body: some View {
Circle()
.fill(
LinearGradient(
gradient: Gradient(colors: [.red, .blue]),
startPoint: .topLeading,
endPoint: .bottomTrailing
)
)
.frame(width: 40, height: 40)
.padding(.horizontal)
}
}
The .frame(width: 40, height: 40) & hostingView.bottomAnchor constant will need to be adjusted to your needs.
And the results for each option (commented in the code):
Option 1
Option 2
View sticks when scrolled
View disappearing underneath on scroll
Without NavigationView
I done this with pure SwiftUI. You have to replace the Image("Profile") line with your own image (maybe from Assets or from base64 data with UIImage).
HStack {
Text("Apps")
.font(.largeTitle)
.fontWeight(.bold)
Spacer()
Image("Profile")
.resizable()
.scaledToFit()
.frame(width: 40, height: 40)
.clipShape(Circle())
}
.padding(.all, 30)
This products following result:
With NavigationView
Let's assume that you have NavigationView and inside that there's only ScrollView and .navigationTitle. You can add that profile image there by using overlay.
NavigationView {
ScrollView {
//your content here
}
.overlay(
ProfileView()
.padding(.trailing, 20)
.offset(x: 0, y: -50)
, alignment: .topTrailing)
.navigationTitle(Text("Apps"))
}
Where ProfileView could be something like this:
struct ProfileView: View {
var body: some View {
Image("Profile")
.resizable()
.scaledToFit()
.frame(width: 40, height: 40)
.clipShape(Circle())
}
}
The result will be like this...
...which is pretty close to the App Store:

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