已发布的对象未更新
我正在构建Watchos Companion应用程序。从视图中，有一个读写和写入价值的滑块。 iOS和WatchOS应用程序之间正在传达此值。
struct ReadingView: View {
@EnvironmentObject var watcher: ViewModelWatch
var body: some View {
CompactSlider(value: $watcher.sliderValue, in: -1000...1000, step: 50, direction: .center) {
VStack {
Text("Compensation")
Text(String(format: "%.0fK", watcher.sliderValue))
}
}
.onChange(of: watcher.sliderValue) { newValue in
ViewModelWatch.shared.session.transferUserInfo(["compensationValue": newValue])
}
}
}
这就是我的模型的样子：
class ViewModelWatch : NSObject, WCSessionDelegate, ObservableObject {
static let shared = ViewModelWatch()
var session: WCSession = .default
@Published var sliderValue = 0.0
init(session: WCSession = .default){
self.session = session
super.init()
self.session.delegate = self
session.activate()
}
func session(_ session: WCSession, didReceiveUserInfo userInfo: [String : Any] = [:]) {
self.sliderValue = userInfo["compensationValue"] as? Double ?? 0.0
}
}
步骤和正在发生的事情：
在iOS和WatchOS上启动了应用程序。
从iOS应用中发送了“ redsessvalue” UserInfo，并在
didReceiveUserInfo中收到了Watch App中的“ iOS应用程序”更新中的slider视图。从Watch App中发送了“ redsestvalue” UserInfo，并以
。didReceiveUserInfo在iOS应用程序中收到，iOS应用程序中的slider视图很好。
问题：
- 现在，当我重复第二步IE时，请从iOS应用程序发送“ redsessvalue” UserInfo来观看应用程序，
compactslider不更新。
就像一旦@publed var sliderValue = 0.0由compactslider编写，当通过didReceive> didreceiveuserinfo更新时，它不会更新视图。
I'm building a WatchOS companion app. In a View there's a Slider that reads and writes value. This value is being communicated between iOS and WatchOS app.
struct ReadingView: View {
@EnvironmentObject var watcher: ViewModelWatch
var body: some View {
CompactSlider(value: $watcher.sliderValue, in: -1000...1000, step: 50, direction: .center) {
VStack {
Text("Compensation")
Text(String(format: "%.0fK", watcher.sliderValue))
}
}
.onChange(of: watcher.sliderValue) { newValue in
ViewModelWatch.shared.session.transferUserInfo(["compensationValue": newValue])
}
}
}
This is how my model looks like:
class ViewModelWatch : NSObject, WCSessionDelegate, ObservableObject {
static let shared = ViewModelWatch()
var session: WCSession = .default
@Published var sliderValue = 0.0
init(session: WCSession = .default){
self.session = session
super.init()
self.session.delegate = self
session.activate()
}
func session(_ session: WCSession, didReceiveUserInfo userInfo: [String : Any] = [:]) {
self.sliderValue = userInfo["compensationValue"] as? Double ?? 0.0
}
}
Steps and what's happening:
Ran the apps on both iOS and WatchOS.
Sent "compensationValue" UserInfo from iOS app and received in
didReceiveUserInfoin the Watch app, the Slider view in iOS app updates just fine.Sent "compensationValue" UserInfo from Watch app and received in
didReceiveUserInfoin the iOS app, the Slider view in iOS app updates just fine.
Issue:
- Now when I repeat the 2nd step i.e., send "compensationValue" UserInfo from iOS app to Watch app, the
CompactSliderdoesn't update.
It's like once @Published var sliderValue = 0.0 is written by CompactSlider, it doesn't update views when updated by didReceiveUserInfo.
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将
私有添加到此行中，如果您的代码中有一个不使用同一实例的区域中的区域，它将公开。
您应该仅使用
viewModelWatch.shared，以便它们可以共享信息。viewModelWatch（）的另一个调用将与viewModelWatch.shared分开Add
privateto this lineIt will expose if there is an area in your code where you are not using the same instance.
You should only be using
ViewModelWatch.sharedso they can share information.Another call of
ViewModelWatch()will be separate fromViewModelWatch.shared尝试在主队列上分配值，例如
或制作视图模型
mainactor如果部署目标版本允许Try to assign value on main queue, like
or make view model
MainActorif deployment target version allows