swiftui

SwiftUI Line Graph Animation using Vector Arithmetic

Why do you want to avoid Metal? Enabling its support is as easy as wrapping your LineGraphShapes into Group and modifying it with a drawingGroup(). Try it out: … Group { let gradient = LinearGradient( gradient: Gradient(colors: [Color.red, Color.blue]), startPoint: .leading, endPoint: .trailing ) LineGraphShape(points: points[selectedPointType], closePath: true) .fill(gradient) LineGraphShape(points: points[selectedPointType], closePath: false) .stroke( gradient, … Read more

SwiftUI – Get size of child?

Updated and generalized @arsenius code. Now you can easily bind a parent view’s state variable. struct ChildSizeReader<Content: View>: View { @Binding var size: CGSize let content: () -> Content var body: some View { ZStack { content() .background( GeometryReader { proxy in Color.clear .preference(key: SizePreferenceKey.self, value: proxy.size) } ) } .onPreferenceChange(SizePreferenceKey.self) { preferences in self.size … Read more

SwiftUI List color background

iOS 16 Since Xcode 14 beta 3, You can change the background of all lists and scrollable contents using this modifier: .scrollContentBackground(.hidden) You can pass in .hidden to make it transparent. So you can see the color or image underneath. iOS 15 and below All SwiftUI’s Lists are backed by a UITableView (until iOS 16). … Read more

SwiftUI – State change in UITextField causes the frameWidth to grow uncontrolled and ignore bounds/frame

You need to decrease priority of content resistance in makeUIView (so content would not push external layout set in SwiftUI) like below func makeUIView(context: UIViewRepresentableContext<MyField>) -> UITextField { let field = UITextField(frame: .zero) field.setContentCompressionResistancePriority(.defaultLow, for: .horizontal) …

How to detect a tap gesture location in SwiftUI?

Well, after some tinkering around and thanks to this answer to a different question of mine, I’ve figured out a way to do it using a UIViewRepresentable (but by all means, let me know if there’s an easier way!) This code works for me! struct ContentView : View { @State var points:[CGPoint] = [CGPoint(x:0,y:0), CGPoint(x:50,y:50)] … Read more

What is Geometry Reader in SwiftUI?

UPDATE Since I posted the answer, I have also written an article on how GeometryReader works. Check it out for a more detailed explanation: https://swiftui-lab.com/geometryreader-to-the-rescue/ GeometryReader is a view that gives you access to the size and position of it’s parent. For example: struct MyView: View { var body: some View { GeometryReader { geometry … Read more

SwiftUI dismiss modal

Using @State property wrapper (recommended) struct ContentView: View { @State private var showModal = false var body: some View { Button(“Show Modal”) { self.showModal.toggle() }.sheet(isPresented: $showModal) { ModalView(showModal: self.$showModal) } } } struct ModalView: View { @Binding var showModal: Bool var body: some View { Text(“Modal view”) Button(“Dismiss”) { self.showModal.toggle() } } } Using presentationMode … Read more

SwiftUI @Binding Initialize

When you use your LoggedInView in your app you do need to provide some binding, such as an @State from a previous view or an @EnvironmentObject. For the special case of the PreviewProvider where you just need a fixed value you can use .constant(false) E.g. #if DEBUG struct LoggedInView_Previews : PreviewProvider { static var previews: … Read more

Get CGRect of View

Update: improved and simplified a possible solution to read rect of any view in any coordinate space via helper extension. Works since Xcode 11.1, retested with Xcode 13.3. Main part: func rectReader(_ binding: Binding<CGRect>, _ space: CoordinateSpace = .global) -> some View { GeometryReader { (geometry) -> Color in let rect = geometry.frame(in: space) DispatchQueue.main.async … Read more

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