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Why must I wrap a call to call to an async/await method in a Task?
Trying to to convert my old URL functionality to SwiftUI with async/await. While the skeleton below works, am puzzled as to why I must place my call to the method within a Task? When I don't use Task I get the error: Cannot pass function of type '() async -> Void' to parameter expecting synchronous function type From the examples I've seen, this wasn't necessary. So I either I've misunderstood something, or I am doing this incorrectly, and am looking for little but of guidance. Thank you Within my SwiftUI view: Button { Task { let request = xFile.makePostRequest(xUser: xUser, script: "requestTicket.pl") var result = await myNewURL.asyncCall(request: request) print("\(result)") } } From a separate class: class MyNewURL: NSObject, ObservableObject { func asyncCall(request: URLRequest) async -> Int { do { let (data, response) = try await URLSession.shared.data(for: request) guard let httpResponse = response as? HTTPURLResponse else { print("error") return -1 } if httpResponse.statusCode == 200 { ... } } catch { return -2 } return 0 } }
1
0
3.6k
Jul ’23
Is there an .onAppear equivalent that works on individual items in a view, and also gets called on redraws?
Within my SwiftUI view I have multiple view items, buttons, text, etc. Within the view, the user selects a ticket, and then clicks a button to upload it. The app then sends the ticket to my server, where the server takes time to import the ticket. So my SwiftUI app needs to make repeated URL calls depending on how far the server has gotten with the ticket. I thought the code below would work. I update the text to show at what percent the server is at. However, it only works once. I guess I thought that onAppear would work with every refresh since it's in a switch statement. If I'm reading my debugger correctly, SwiftUI recalls which switch statement was called last and therefore it views my code below as a refresh rather than a fresh creation. So is there a modifier that would get fired repeatedly on every view refresh? Or do I have to do all my multiple URL calls from outside the SwiftUI view? Something like onInitialize but for child views (buttons, text, etc.) within the main view? switch myNewURL.stage { case .makeTicket: Text(myNewURL.statusMsg) .padding(.all, 30) case .importing: Text(myNewURL.statusMsg) .onAppear{ Task { try! await Task.sleep(nanoseconds: 7000000000) print ("stage two") let request = xFile.makeGetReq(xUser: xUser, script: "getTicketStat.pl") var result = await myNewURL.asyncCall(request: request, xFile: xFile) } } .padding(.all, 30) case .uploadOriginal: Text(myNewURL.statusMsg) .padding(.all, 30) case .JSONerr: Text(myNewURL.statusMsg) .padding(.all, 30) }
1
0
1.1k
Jul ’23
Can I install Xcode on an external HD?
I hope this isn't too off-topic, but I'm in a bind My HD is so full that I can't download any new iOS' in Xcode. Actually, there's a lot I can't do. According to the storage part of System Details, Developer is over 100 GB. I have a huge external HD and would like to completely remove and clean Xcode, and the reinstall it on the external HD. 1 - Is this allowed? Some people say that all apps must be installed in the Applications folder. Checking the web I get both answers. 2 - If it is allowed, is there a way to properly clean out? Because every website I found that describes this procedure is touting their own cleanup app. Thank you
1
0
1.6k
Nov ’23
How can I dismiss keyboard on TextField losing focus?
Am trying to figure out how to dismiss the iOS keyboard if my TextFields do not have focus. Obviously when clicking a button I can call a dismiss keyboard function. But what I wanted to learn was how to dismiss the keyboard of if the user hits return OR clicks off of the TextFields. Before I could figure out the "user hit return part" I got stuck at the user being able to click away from the TextFields. While I can add a onTapGesture to the text fields, I wonder if I can do something like detecting a tapGesture to the entire screen, so that if the user taps on any blank space I could call the dismiss keyboard function. import SwiftUI struct ContentView: View { @State var textField1 = "" @State var textField2 = "" @State var hasFocus = "No text field has focus" @FocusState var leftTyping : Bool @FocusState var rightTyping : Bool var body: some View { VStack { Text(hasFocus) .font(.largeTitle) HStack { TextField("left" , text: $textField1) .focused($leftTyping) .onChange(of: leftTyping) { if leftTyping == false, rightTyping == false { hideKeyboard() hasFocus = "No text field has focus" } else if leftTyping { hasFocus = "focus on left field" } } TextField("right", text: $textField2) .focused($rightTyping) .onChange(of: rightTyping) { if leftTyping == false, rightTyping == false { hideKeyboard() hasFocus = "No text field has focus" } else if rightTyping { hasFocus = "focus on right field" } } } Button ("steal focus"){ hideKeyboard() hasFocus = "No text field has focus" } .buttonStyle(.borderedProminent) .tint(.brown) .font(.largeTitle) .padding(10) .foregroundStyle(.white) } .padding() } func hideKeyboard() { UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil) } } #Preview { ContentView() } Is there a way to do this?
0
0
882
Dec ’23
Where can I find a tutorial on using GeometryReader within a View's background (closure) modifier?
Someone showed me the code below, when I was trying to figure out how to detect which views were being intercepted by one continuous DragGesture. It works, but I would like to find a tutorial whre I can learn what's going on here. From what I can tell, the background modifier is a closure, that calls a function which has a GeometryReader which returns a view. I've Googled .background as a closure in swiftui and still can't find any form of tutorial that discuss what is going on here. Not looking for the answers, looking to learn. Thank you struct ContentView: View { @State private var dragLocation = CGPoint.zero @State private var dragInfo = " " private func dragDetector(for name: String) -> some View { GeometryReader { proxy in let frame = proxy.frame(in: .global) let isDragLocationInsideFrame = frame.contains(dragLocation) let isDragLocationInsideCircle = isDragLocationInsideFrame && Circle().path(in: frame).contains(dragLocation) Color.clear .onChange(of: isDragLocationInsideCircle) { oldVal, newVal in if dragLocation != .zero { dragInfo = "\(newVal ? "entering" : "leaving") \(name)..." } } } } var body: some View { ZStack { Color(white: 0.2) VStack(spacing: 50) { Text(dragInfo) .foregroundStyle(.white) HStack { Circle() .fill(.red) .frame(width: 100, height: 100) .background { dragDetector(for: "red") } Circle() .fill(.white) .frame(width: 100, height: 100) .background { dragDetector(for: "white") } Circle() .fill(.blue) .frame(width: 100, height: 100) .background { dragDetector(for: "blue") } } } } .gesture( DragGesture(coordinateSpace: .global) .onChanged { val in dragLocation = val.location } .onEnded { val in dragLocation = .zero dragInfo = " " } ) } }
0
0
434
Jan ’24
Is there a trick to viewing an EnvironmentObject in Xcode debugger? They currently show up as invalid Expression.
I am trying to watch an @EnvironmentObject in the Xcode debugger and it comes up as an Invalid Expression in the View pane. If I want to view it, I need to declare it as a local variable and then assign it the value of the passed in @EnvironmentObject. While not impossible, it's a lot of work. Or maybe I am doing something incorrectly and this is a symptom of that? Would like to resolve this. encl: Example code & Screenshot, where choice is the passed/unviewable EnviornmentObject and ch is the local variable I use to view it in the debugger Project "TestingApp" File: TestingApp import SwiftUI @main struct TestingApp: App { @StateObject private var choice = Choices() var body: some Scene { WindowGroup { ContentView() .environmentObject(choice) } } } File: Choices import Foundation @MainActor class Choices: ObservableObject { @Published var aChoice = 1 @Published var bChoice = 2 } File: ContentView import SwiftUI struct ContentView: View { @EnvironmentObject private var choice: Choices var body: some View { VStack { let ch = choice Text("\(choice.aChoice)") .font(.largeTitle) .padding(.bottom) Text("2") .font(.largeTitle) } .padding() } } #Preview { ContentView() }
0
0
622
Mar ’24
Can a button call a new view without using NavigationStack/Link/View?
Is it possible to switch to a new View without using NavigationStack or NavigationLink or NavigationView? I know I can do it with a Bool, which either shows the second view, or the first, and then toggles the Bool. But can't I do something like this? Which obviously doesn't work. struct BasicButton: View { var buttonLabel = "Create User" var body: some View { Button { CreateUser() //another SwiftUI view, not a function } label: { Text(buttonLabel) } } }
3
0
940
May ’24
How can I enable HTTP exceptions in Xcode 15?
Before Xcode 15, when I could access the info.plist file, I was able to add exceptions to the App Transport Security Settings so I could connect with my home server, which has no HTTPS, just HTTP. But in Xcode 15 I have no idea, not can I buy a clue with google, on how to do this. Please help! Thanks p.s. I should probably add that one site mentioned going to the Target section of your project allows easy access to info.plist. Yet for some strange reason, there is no item in Targets, which is odd, as I can debug my. project.
1
0
407
Jun ’24
How can I enable HTTP exceptions in Xcode 15?
Before Xcode 15, when I could access the info.plist file, I was able to add exceptions to the App Transport Security Settings so I could connect with my home server, which has no HTTPS, just HTTP. But in Xcode 15 I have no idea, not can I buy a clue with google, on how to do this. Please help! Thanks p.s. I should probably add that one site mentioned going to the Target section of your project allows easy access to info.plist. Yet for some strange reason, there is no item in Targets, which is odd, as I can debug my. project.
0
0
848
Jun ’24
Why must I wrap a call to call to an async/await method in a Task?
Trying to to convert my old URL functionality to SwiftUI with async/await. While the skeleton below works, am puzzled as to why I must place my call to the method within a Task? When I don't use Task I get the error: Cannot pass function of type '() async -> Void' to parameter expecting synchronous function type From the examples I've seen, this wasn't necessary. So I either I've misunderstood something, or I am doing this incorrectly, and am looking for little but of guidance. Thank you Within my SwiftUI view: Button { Task { let request = xFile.makePostRequest(xUser: xUser, script: "requestTicket.pl") var result = await myNewURL.asyncCall(request: request) print("\(result)") } } From a separate class: class MyNewURL: NSObject, ObservableObject { func asyncCall(request: URLRequest) async -> Int { do { let (data, response) = try await URLSession.shared.data(for: request) guard let httpResponse = response as? HTTPURLResponse else { print("error") return -1 } if httpResponse.statusCode == 200 { ... } } catch { return -2 } return 0 } }
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0
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3.6k
Activity
Jul ’23
Is there an .onAppear equivalent that works on individual items in a view, and also gets called on redraws?
Within my SwiftUI view I have multiple view items, buttons, text, etc. Within the view, the user selects a ticket, and then clicks a button to upload it. The app then sends the ticket to my server, where the server takes time to import the ticket. So my SwiftUI app needs to make repeated URL calls depending on how far the server has gotten with the ticket. I thought the code below would work. I update the text to show at what percent the server is at. However, it only works once. I guess I thought that onAppear would work with every refresh since it's in a switch statement. If I'm reading my debugger correctly, SwiftUI recalls which switch statement was called last and therefore it views my code below as a refresh rather than a fresh creation. So is there a modifier that would get fired repeatedly on every view refresh? Or do I have to do all my multiple URL calls from outside the SwiftUI view? Something like onInitialize but for child views (buttons, text, etc.) within the main view? switch myNewURL.stage { case .makeTicket: Text(myNewURL.statusMsg) .padding(.all, 30) case .importing: Text(myNewURL.statusMsg) .onAppear{ Task { try! await Task.sleep(nanoseconds: 7000000000) print ("stage two") let request = xFile.makeGetReq(xUser: xUser, script: "getTicketStat.pl") var result = await myNewURL.asyncCall(request: request, xFile: xFile) } } .padding(.all, 30) case .uploadOriginal: Text(myNewURL.statusMsg) .padding(.all, 30) case .JSONerr: Text(myNewURL.statusMsg) .padding(.all, 30) }
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1
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0
Views
1.1k
Activity
Jul ’23
Change the default simulator on Xcode 12.5
It's a small thing, but every time I open my current Xcode project the default iOS device to run my app on is my phone. Is there a way to change it to one of the simulators? i.e. iPhone Pro 11?
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4
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2
Views
23k
Activity
Sep ’23
Can I install Xcode on an external HD?
I hope this isn't too off-topic, but I'm in a bind My HD is so full that I can't download any new iOS' in Xcode. Actually, there's a lot I can't do. According to the storage part of System Details, Developer is over 100 GB. I have a huge external HD and would like to completely remove and clean Xcode, and the reinstall it on the external HD. 1 - Is this allowed? Some people say that all apps must be installed in the Applications folder. Checking the web I get both answers. 2 - If it is allowed, is there a way to properly clean out? Because every website I found that describes this procedure is touting their own cleanup app. Thank you
Replies
1
Boosts
0
Views
1.6k
Activity
Nov ’23
How can I dismiss keyboard on TextField losing focus?
Am trying to figure out how to dismiss the iOS keyboard if my TextFields do not have focus. Obviously when clicking a button I can call a dismiss keyboard function. But what I wanted to learn was how to dismiss the keyboard of if the user hits return OR clicks off of the TextFields. Before I could figure out the "user hit return part" I got stuck at the user being able to click away from the TextFields. While I can add a onTapGesture to the text fields, I wonder if I can do something like detecting a tapGesture to the entire screen, so that if the user taps on any blank space I could call the dismiss keyboard function. import SwiftUI struct ContentView: View { @State var textField1 = "" @State var textField2 = "" @State var hasFocus = "No text field has focus" @FocusState var leftTyping : Bool @FocusState var rightTyping : Bool var body: some View { VStack { Text(hasFocus) .font(.largeTitle) HStack { TextField("left" , text: $textField1) .focused($leftTyping) .onChange(of: leftTyping) { if leftTyping == false, rightTyping == false { hideKeyboard() hasFocus = "No text field has focus" } else if leftTyping { hasFocus = "focus on left field" } } TextField("right", text: $textField2) .focused($rightTyping) .onChange(of: rightTyping) { if leftTyping == false, rightTyping == false { hideKeyboard() hasFocus = "No text field has focus" } else if rightTyping { hasFocus = "focus on right field" } } } Button ("steal focus"){ hideKeyboard() hasFocus = "No text field has focus" } .buttonStyle(.borderedProminent) .tint(.brown) .font(.largeTitle) .padding(10) .foregroundStyle(.white) } .padding() } func hideKeyboard() { UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil) } } #Preview { ContentView() } Is there a way to do this?
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0
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0
Views
882
Activity
Dec ’23
Why is Playground taking so long of just three lines of code?
Using Xcode 15.0.1 The playground, for the code below, has been in "Launching ok" for over two minutes. Anything that I should look into? A little mind boggling actually. import UIKit var msg = "Hello World" print ("\(msg)")
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2
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0
Views
1.4k
Activity
Dec ’23
Where can I find a tutorial on using GeometryReader within a View's background (closure) modifier?
Someone showed me the code below, when I was trying to figure out how to detect which views were being intercepted by one continuous DragGesture. It works, but I would like to find a tutorial whre I can learn what's going on here. From what I can tell, the background modifier is a closure, that calls a function which has a GeometryReader which returns a view. I've Googled .background as a closure in swiftui and still can't find any form of tutorial that discuss what is going on here. Not looking for the answers, looking to learn. Thank you struct ContentView: View { @State private var dragLocation = CGPoint.zero @State private var dragInfo = " " private func dragDetector(for name: String) -> some View { GeometryReader { proxy in let frame = proxy.frame(in: .global) let isDragLocationInsideFrame = frame.contains(dragLocation) let isDragLocationInsideCircle = isDragLocationInsideFrame && Circle().path(in: frame).contains(dragLocation) Color.clear .onChange(of: isDragLocationInsideCircle) { oldVal, newVal in if dragLocation != .zero { dragInfo = "\(newVal ? "entering" : "leaving") \(name)..." } } } } var body: some View { ZStack { Color(white: 0.2) VStack(spacing: 50) { Text(dragInfo) .foregroundStyle(.white) HStack { Circle() .fill(.red) .frame(width: 100, height: 100) .background { dragDetector(for: "red") } Circle() .fill(.white) .frame(width: 100, height: 100) .background { dragDetector(for: "white") } Circle() .fill(.blue) .frame(width: 100, height: 100) .background { dragDetector(for: "blue") } } } } .gesture( DragGesture(coordinateSpace: .global) .onChanged { val in dragLocation = val.location } .onEnded { val in dragLocation = .zero dragInfo = " " } ) } }
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0
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0
Views
434
Activity
Jan ’24
Is there a trick to viewing an EnvironmentObject in Xcode debugger? They currently show up as invalid Expression.
I am trying to watch an @EnvironmentObject in the Xcode debugger and it comes up as an Invalid Expression in the View pane. If I want to view it, I need to declare it as a local variable and then assign it the value of the passed in @EnvironmentObject. While not impossible, it's a lot of work. Or maybe I am doing something incorrectly and this is a symptom of that? Would like to resolve this. encl: Example code & Screenshot, where choice is the passed/unviewable EnviornmentObject and ch is the local variable I use to view it in the debugger Project "TestingApp" File: TestingApp import SwiftUI @main struct TestingApp: App { @StateObject private var choice = Choices() var body: some Scene { WindowGroup { ContentView() .environmentObject(choice) } } } File: Choices import Foundation @MainActor class Choices: ObservableObject { @Published var aChoice = 1 @Published var bChoice = 2 } File: ContentView import SwiftUI struct ContentView: View { @EnvironmentObject private var choice: Choices var body: some View { VStack { let ch = choice Text("\(choice.aChoice)") .font(.largeTitle) .padding(.bottom) Text("2") .font(.largeTitle) } .padding() } } #Preview { ContentView() }
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0
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0
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622
Activity
Mar ’24
Calling up iOS keyboard on a SwiftUI view with no TextFields
Would like to be able to bring up the iOS keyboard in a SwiftUI view without having to use a TextField? The goal would be to capture each keyup, or keydown, using .onKeyPress While I thought I could create a TextField not visible to the user, was hoping there was a cleaner way.
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0
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0
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514
Activity
Mar ’24
Is there an app to read CoreData data directly?
Is there any app out there that lets you browse through a CoreData database? When I first started to learn Swift, an app called Liya seemed to work. But alas, no longer. it would just make it easier if there was anything out there that let you browse the data directly. Thanks
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1
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0
Views
621
Activity
Mar ’24
Xcode 15 preview won't run till I do a debug session and run the simulator first
So like the title says, when I start up Xcode the preview won;t work till I run a debug session using the simulator. Sometimes the debug session is unable to start the simulator, which I can start manually then run a debug session. Once all the above is done, preview works. Any idea what is causing this behavior?
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2
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0
Views
765
Activity
May ’24
Can a button call a new view without using NavigationStack/Link/View?
Is it possible to switch to a new View without using NavigationStack or NavigationLink or NavigationView? I know I can do it with a Bool, which either shows the second view, or the first, and then toggles the Bool. But can't I do something like this? Which obviously doesn't work. struct BasicButton: View { var buttonLabel = "Create User" var body: some View { Button { CreateUser() //another SwiftUI view, not a function } label: { Text(buttonLabel) } } }
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3
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0
Views
940
Activity
May ’24
Can I open two separate Xcode windows with the same project ?
Can I open two separate Xcode windows with the same project ? I have multiple monitors, so would love to be able use them to view different files of the same project. Is there a way?
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1
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0
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722
Activity
May ’24
How can I enable HTTP exceptions in Xcode 15?
Before Xcode 15, when I could access the info.plist file, I was able to add exceptions to the App Transport Security Settings so I could connect with my home server, which has no HTTPS, just HTTP. But in Xcode 15 I have no idea, not can I buy a clue with google, on how to do this. Please help! Thanks p.s. I should probably add that one site mentioned going to the Target section of your project allows easy access to info.plist. Yet for some strange reason, there is no item in Targets, which is odd, as I can debug my. project.
Replies
1
Boosts
0
Views
407
Activity
Jun ’24
How can I enable HTTP exceptions in Xcode 15?
Before Xcode 15, when I could access the info.plist file, I was able to add exceptions to the App Transport Security Settings so I could connect with my home server, which has no HTTPS, just HTTP. But in Xcode 15 I have no idea, not can I buy a clue with google, on how to do this. Please help! Thanks p.s. I should probably add that one site mentioned going to the Target section of your project allows easy access to info.plist. Yet for some strange reason, there is no item in Targets, which is odd, as I can debug my. project.
Replies
0
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0
Views
848
Activity
Jun ’24