当我尝试接收@EnvironmentObject的@Published属性时,有没有办法防止onReceive在视图初始加载时触发?
这是视图:
struct ContentView: View {
@EnvironmentObject var appState: AppState
var body: some View {
VStack {
Text(appState.test)
.padding()
}
.onAppear() {
appState.test = "World"
}
.onReceive(appState.$test) { test in
print("Hello from onReceive: \(test)")
}
}
}
这是环境对象:
public class AppState: ObservableObject {
@Published public var test = "hello"
}
输出:
Hello from onReceive: hello
Hello from onReceive: World
我猜第一个函数是在注入环境对象时触发的。除了在onAppear中设置一些hackish bool之外,还有其他方法可以防止这种情况吗?理想情况下,我只想看到“来自onReceive的问候:世界”。这只是一个简单的例子。在我的实际应用程序中,我正在从服务中获取数据,在环境对象中当清除错误状态时,我希望它会触发onReceive并执行其他逻辑,然后重新获取。