有没有办法在SwiftUI中创建WKExtendedRuntimeSession的新会话

Question

我在watchOS中创建了一个简单的倒计时计时器。当您按下start时，计时器启动，session.start也被声明。背景下一切都很好。然后，当它通过按钮或计时器停止时，会话将无效。

顺便说一下，我正在阅读这里的文档

它指出一次只能安排一个会话；如果需要重新安排会话，请使当前会话无效，然后安排一个新会话"；

所以我的问题是，如何在SwiftUI中创建新会话这是我的代码：

import SwiftUI
struct TestView: View {
@State var start = false
@State var number = 10
@State var time = Timer.publish(every: 1, on: .main, in: .common).autoconnect()
var session = WKExtendedRuntimeSession()
var body: some View {
VStack {
Text("(number)")
Spacer()
Button(action: {
self.start.toggle()
if self.start {
session.start()
} else {
session.invalidate()
}
}) {
Text(self.start ? "Stop" : "Start")
}
}.onReceive(self.time) { (_) in
if self.start {
if number > 0 {
number -= 1
} else {
self.start.toggle()
number = 10
session.invalidate()
}
}

}

}
}

Answer 1

最好在课堂上进行，如Coordinator

class SessionCoordinator {
private var session: WKExtendedRuntimeSession?
func start() {
guard session?.state != .running else { return }
// create or recreate session if needed
if nil == session || session?.state == .invalid {
session = WKExtendedRuntimeSession()
}
session?.start()
}
func invalidate() {
session?.invalidate()
}
}
struct TestView: View {
let coordinator = SessionCoordinator()
@State var start = false
@State var number = 10
@State var time = Timer.publish(every: 1, on: .main, in: .common).autoconnect()
var body: some View {
VStack {
Text("(number)")
Spacer()
Button(action: {
self.start.toggle()
if self.start {
coordinator.start()
} else {
coordinator.invalidate()
}
}) {
Text(self.start ? "Stop" : "Start")
}
}.onReceive(self.time) { (_) in
if self.start {
if number > 0 {
number -= 1
} else {
self.start.toggle()
number = 10
coordinator.invalidate()
}
}
}
}
}