Using AppKit you can add NSMenuItems to an
NSMenu. I saw that there is something similar to NSMenu in SwiftUI, namely
MenuButton. But I cannot find any documentation on how it works.
I tried the following:MenuButton("+") { Button("New contact") { print("Create new contact") } Button("New group") { print("Create new group") }}And that looks almost OK butThe buttons have a different background color than the menu (notice the slightly lighter color above and beneath the menu items).When I hover the menu items, their background color doesn't change like a normal macOS menu.I also tried to change the background color manually using the .background() modifier but that doesn't affect the full width of the menu item.
I suppose this is because I am placing Buttons inside the
MenuButton while it is probably expecting some other SwiftUI element. What elements should I place inside MenuButtons to create a normal-looking macOS menu?
See this stackoverflow post for more detailed images that describe what I mean: https://stackoverflow.com/questions/59837991/how-to-add-menu-items-to-a-menubutton-in-swiftui
damiaan
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for
Post
Replies
Boosts
Views
Activity
How can we drag views coupled to an NSItemProvider with a custom typeIdentifier or UTI ?
I know you can use the following methods in conjunction with predefined UTI types (like kUTTypeText etc.): onDrag(_: () -> NSItemProvider) -> some View - https://developer.apple.com/documentation/swiftui/view/3289004-ondrag
onDrop(of: [String], isTargeted: Binding<Bool>?, perform action: ([NSItemProvider]) -> Bool) -> some View - https://developer.apple.com/documentation/swiftui/view/3289007-ondrop
But what if I want to use an itemProvider with a custom UTI?
I tried:
import SwiftUI
struct ContentView: View {
static let type = "com.devian.sampleapp.customstring.dragdroptype"
@State var dropZoneIsHovered = false
var body: some View {
VStack {
Text("Hello")
.padding()
.onDrag(createItem)
Text("Dropzone")
.padding()
.background(dropZoneIsHovered ? Color.gray : nil)
.onDrop(
of: [ContentView.type],
isTargeted: $dropZoneIsHovered,
perform: acceptDrop(items:)
)
}.padding()
}
func createItem() -> NSItemProvider {
NSItemProvider(
item: "Hello" as NSString,
typeIdentifier: ContentView.type
)
}
func acceptDrop(items: [NSItemProvider]) -> Bool {
print("Hurray we received a custom item")
return true
}
}
But the dropzone does not accept custom UTI's
I also tried to export the custom UTI using Info.plist:
<array>
<dict>
<key>UTTypeConformsTo</key>
<array>
<string>public.data</string>
</array>
<key>UTTypeIdentifier</key>
<string>com.devian.sampleapp.customstring.dragdroptype</string>
<key>UTTypeTagSpecification</key>
<dict/>
</dict>
</array>
But that did not work either. Then I tried to add it as a document type in Info.plist
<array>
<dict>
<key>CFBundleTypeRole</key>
<string>None</string>
<key>LSItemContentTypes</key>
<array>
<string>com.devian.sampleapp.customstring.dragdroptype</string>
</array>
<key>LSTypeIsPackage</key>
<integer>0</integer>
</dict>
</array>
Nothing of the above works on macOS. What am I doing wrong?
I need to implement a custom discovery protocol using UDP. It works like this: You broadcast a beacon to a broadcast address (like 255.255.255.255).
You wait for clients that respond to your beacon.
The problem is: how can I get the addresses of the clients once they send their response?
Sending
I sent the beacon like this:
let connection = NWConnection(
to: .hostPort(
host: .ipv4(.broadcast),
port: .init(integerLiteral: discoveryPort)
),
using: .udp
)
connection.start(queue: .main)
connection.send(
content: beacon,
completion: .contentProcessed(sendCompleted)
)
Receiving
To receive the responses from the clients I use
connection.receiveMessage {
(message: Data?, context: NWConnection.ContentContext?, isComplete: Bool, optionalError: NWError?) in
// Great I got a response...
// But how do I know where this is coming from?
}
I tried to create a framer that splits a stream of ASCII bytes into frames separated by the pipe ascii character: "|".
So I made an NWProtocolFramerImplementation as seen in the attached document.
Framer Implementation.swift - https://developer.apple.com/forums/content/attachment/fd158172-dcf3-4a00-9e66-fac477ab3c23
The problem is that from the moment I get a chunk that does not end with "|", the framer gets stuck on that chunk. So the other chunks that come after this incomplete chunk never fully arrive in the framer.parseInput(...) call. Because it always parses chunks of minimumIncompleteLength and hence never arrives to the point where the next "|" is.
Here is a simple reproduction of this problem:
Create a TCP server
Setup the server so that it sends chunks of messages when a client connects.
Connect to the server (created in 1.) using the framer from above.
Start receiving messages.
import Network
let client = DispatchQueue(label: "Server")
let server = DispatchQueue(label: "Client")
let networkParameters = NWParameters.tcp
networkParameters.defaultProtocolStack.applicationProtocols.insert(NWProtocolFramer.Options(definition: PipeFramer.definition), at: 0)
let server = try! NWListener(using: .tcp)
server.newConnectionHandler = { connection in
		print("server: new connection from", connection.endpoint)
		print("server (client \(connection.endpoint)): state", connection.state)
		connection.viabilityUpdateHandler = { viable in
				print("server (client \(connection.endpoint)): state", connection.state)
				if viable {
						print("server: sending")
						connection.send(content: "A|Be||Sea".data(using: .utf8)!, isComplete: false, completion: .idempotent)
						serverQueue.asyncAfter(deadline: .now() + 5) {
								print("server: sending second part")
								connection.send(content: " is longer than expected|0|".data(using: .utf8)!, isComplete: true, completion: .idempotent)
						}
						serverQueue.asyncAfter(deadline: .now() + 8) {
								print("server: sending last part")
								connection.send(content: "Done|".data(using: .utf8)!, isComplete: true, completion: .idempotent)
						}
				}
		}
		connection.start(queue: serverQueue)
}
server.stateUpdateHandler = { state in
		print("server:", state)
		if state == .ready, let port = server.port {
				print("server: listening on", port)
		}
}
server.start(queue: serverQueue)
let client = NWConnection(to: .hostPort(host: "localhost", port: server.port!), using: networkParameters)
func receiveNext() {
		client.receiveMessage { (data, context, complete, error) in
				let content: String
				if let data = data {
						content = String(data: data, encoding: .utf8) ?? data.description
				} else {
						content = data?.debugDescription ?? "<no data>"
				}
				print("client: received \"\(content)\"", context.debugDescription, complete, error?.localizedDescription ?? "No error")
				receiveNext()
		}
}
client.stateUpdateHandler = { state in
		print("client:", state)
		if state == .ready {
				print("client: receiving")
				receiveNext()
		}
}
client.start(queue: clientQueue)
Results in:
server: waiting(POSIXErrorCode: Network is down)
server: ready
server: listening on 54894
client: preparing
client: ready
client: receiving
server: new connection from ::1.53179
server (client ::1.53179): state setup
server (client ::1.53179): state ready
server: sending
client: parsing buffer: "A|Be||Sea"
client: minLength set to 1
client: parsing buffer: "Be||Sea"
client: minLength set to 1
client: parsing buffer: "|Sea"
client: minLength set to 1
client: parsing buffer: "Sea"
client: minLength set to 4
client: parsing buffer: ""
client: minLength set to 1
client: received "A" Optional(Network.NWConnection.ContentContext) true No error
client: received "Be" Optional(Network.NWConnection.ContentContext) true No error
client: received "<no data>" Optional(Network.NWConnection.ContentContext) true No error
client: parsing buffer: "Sea"
client: minLength set to 4
server: sending second part
client: parsing buffer: "Sea "
client: minLength set to 5
client: parsing buffer: "Sea i"
client: minLength set to 6
server: sending last part
client: parsing buffer: "Sea is"
client: minLength set to 7
client: parsing buffer: "Sea is "
client: minLength set to 8
Notice that the fourth and fifth message are never received by the client. How should I write the Framer so that it receives messages after an incoming incomplete chunk?