问题描述
我正在测试用于共享活动的新 FaceTime API。即使我跟随开发人员会议,我的数据偶尔也会不同步。我相信这可能与我在下面遇到的运行时错误有关。
“不允许从后台线程发布更改;确保在模型更新时从主线程发布值(通过如 receive(on:) 之类的操作符)。”线
@Published var groupSession: GroupSession<DrawTogether>?
var messenger: GroupSessionMessenger?
func configureGroupSession(_ groupSession: GroupSession<DrawTogether>){
reset()
let messenger = GroupSessionMessenger(session: groupSession)
self.messenger = messenger
self.groupSession = groupSession
groupSession.$activeParticipants
.sink { activeParticipants in
let newParticipants =
activeParticipants.subtracting(groupSession.activeParticipants)
async {
do {
try await messenger.send(CanvasMessage(elements: self.elements),to: .only(newParticipants))
} catch {
print("Unable to update new participants")
}
}
}
.store(in: &subscriptions)
let emojiTask = detach { [weak self] in
for await (message,_) in messenger.messages(of:
UpsertEmojiMessage.self){
await self?.handle(message)
}
}
tasks.insert(emojiTask)
let task = detach { [weak self] in
for await (message,_) in messenger.messages(of: CanvasMessage.self) {
await self?.handle(message)
}
}
tasks.insert(task)
groupSession.join()
}
func handle(_ message: UpsertEmojiMessage) {
let element = Element(emoji: message.emoji,postion: message.position)
elements.append(element)
}
func handle(_ message: CanvasMessage) {
//guard message.elements.count > self.elements.count else { return }
self.elements = message.elements // Warning occurs on this line
}
解决方法
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