I'm working with the latest Swift and want to write a transparent app for Macs. The window should be transparent as I said, also the edges. Does this work at all?
Something like that but that obviously doesn't work...
import SwiftUI
import CoreData
struct ContentView: View {
var body: some View {
Color.clear;
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Related
I am learning SwiftUI and tried to make a simple todo list but I'm having issues understanding why #Binding property doesn't update my preview.
The code is the following.
import SwiftUI
struct TodoRow: View {
#Binding var todo: Todo
var body: some View {
HStack {
Button(action: {
todo.completed.toggle()
}, label: {
Image(systemName: todo.completed ? "checkmark.square" : "square")
})
.buttonStyle(.plain)
Text(todo.title)
.strikethrough(todo.completed)
}
}
}
struct TodoRow_Previews: PreviewProvider {
static var previews: some View {
TodoRow(todo: .constant(Todo.sampleData[0]))
}
}
The preview doesn't update when I click the square button but the app works fine. Am I using it incorrectly?
EDIT:
Even without .constant(#), the preview doesn't work.
struct TodoRow_Previews: PreviewProvider {
#State private static var todo = Todo.sampleData[0]
static var previews: some View {
TodoRow(todo: $todo)
}
}
Found a solution in the article Testing SwiftUI Bindings in Xcode Previews.
In order for previews to change you must create a container view that holds state and wraps the view you're working on.
In my case what I've ended up doing was changing my preview to the following.
struct TodoRow_Previews: PreviewProvider {
// A View that simply wraps the real view we're working on
// Its only purpose is to hold state
struct TodoRowContainer: View {
#State private var todo = Todo.sampleData[0]
var body: some View {
TodoRow(todo: $todo)
}
}
static var previews: some View {
Group {
TodoRow(todo: .constant(Todo.sampleData[0]))
.previewDisplayName("Immutable Row")
TodoRowContainer()
.previewDisplayName("Mutable Row")
}
}
}
Do you know why the back button still showing after I wrote
.navigationBarBackButtonHidden(true)
it seem that Xcode doesn't read it correctly.
import SwiftUI
import CoreData
struct ContentView: View {
#State var goToHome: Bool = false
var body: some View {
NavigationStack {
VStack {
Welcome(gotoSomewhere: $goToHome)
}
.navigationDestination(isPresented: $goToHome) { Home() }
.navigationBarBackButtonHidden(true) //HERE IS THE NAVIGATIONBAR HIDDEN
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView().environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
}
}
I tried to write an NavigationLink but then shows me the alert:
... was deprecated in iOS 16.0: use NavigationLink(value:label:)
inside a NavigationStack or NavigationSplitView
This modifier .navigationBarBackButtonHidden(true) should be on home.
Home().navigationBarBackButtonHidden(true)
And yes the NavigationLink will be deprecated in the future, it's up to you whether it's important or not to include at the moment in your app.
I was in the process of creating an application in which I use information about Color Filters and more specifically Grayscale. And property UIAccessibility.isGrayscaleEnabled stopped working. I created a simple view in which I check whether the information about bold or color invert works. And it works. Only for grayscale it doesn't. What might be the issue here?
import SwiftUI
import UIKit
struct ContentView: View {
var body: some View {
VStack {
Text("Bold: " + String(UIAccessibility.isBoldTextEnabled))
Text("Grayscale: " + String(UIAccessibility.isGrayscaleEnabled))
Text("Invert: " + String(UIAccessibility.isInvertColorsEnabled))
}
.padding()
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
I am a beginner and would appreciate any advice ☺️ Thanks!
I have a simple test watchOS application with a TextField in a secondary view (navigated to from a NavigationLink).
However, when the TextField is canceled or submitted, it will pop back out to the root view instead of staying in the current view. I can't find any information on this anywhere else. Any fixes?
ContentView:
import SwiftUI
struct ContentView: View {
var body: some View {
NavigationView{
NavigationLink("what", destination: DestinationView())
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
DestinationView:
import SwiftUI
struct DestinationView: View {
#State private var message: String = ""
var body: some View {
TextField(
"Send Something...",
text: $message
)
}
}
struct DestinationView_Previews: PreviewProvider {
static var previews: some View {
DestinationView()
}
}
I found the issue..
I was using a NavigationView, which is deprecated. I removed it and now it's working as intended. (XCode 13.2.1, watchOS 8.3)
*facepalm*
I am working on a project that at some point it receives a notification. When that happens, I need to show a View. I am not able to catch notification from any View so I am looking for a way to change to control it from outside of View structs. After the View's purpose is done, I need to dismiss it where the app left off. Think like the native behaviour when there is an active call.
I thought I could use sheet however I could not find any way to trigger it for every View that could be active when the notifications come. Or maybe trying to extend native View class would work but again, no luck finding a tutorial.
Any help will be appreciated.
Just update your model based on notification. There is not necessary to define .sheet (modal view) everywhere in your view hierarchy. Doing it in root view should be enough.
To demonstrate that (copy - paste - run) I create small project where I mimic notification with SwiftUI Toggle.
import SwiftUI
class Model: ObservableObject {
#Published var show = false
}
struct SubView: View {
#EnvironmentObject var model: Model
var tag: Int
var body: some View {
VStack {
NavigationLink(destination: SubView(tag: tag + 1).environmentObject(model)) {
Text("subview \(tag)")
}
if tag == 2 {
Toggle(isOn: $model.show) {
Text("toggle")
}.padding()
}
}.navigationBarTitle("subview \(tag)")
}
}
struct ContentView: View {
#ObservedObject var model = Model()
var body: some View {
NavigationView {
SubView(tag: 0).environmentObject(model)
}.sheet(isPresented: $model.show) {
Text("sheet")
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
with the result