与Reactive和非Reactive iOS项目一样，如果您有一个UI元素（例如正在选择的按钮或表视图单元格）将视图控制器推送到导航堆栈，如果有的话由于某种原因滞后（特别是在较旧的设备上）重复点击会导致重复推送，从而导致用户体验不良。
通常你可以在第一次点击后禁用该元素。
例如：
@IBAction func myButtonTap() {
button.isEnabled = false
doTheRestOfTheAction()
}
我对RxSwift相对较新。我试图找出一个适当的反应方式来实现这个来修复我的应用程序中的一些错误，其中重复推送视图。
一些想法：
可以使用debounce或throttle，但看起来像是一个绑带，并不一定会解决所有情况。
我目前认为最好的方法是在预期事件发生后处理订阅。
let disposable = tableView.rx.itemSelected
.subscribe(onNext: { [weak self] indexPath in
self?.performSegue(withIdentifier: "MySegueIdentifier", sender: self)
})
...
func prepareForSegue() {
myDisposable.dispose()
finishPrepareForSegue()
}
虽然如果你想在订阅块中取消订阅，编译器会抱怨在自己的初始值中使用变量，这是有道理的。我想有一些解决方法，但我想知道，有更好的方法吗？也许是我失踪的反应运营商？
试图搜索类似的例子，但结果有限。
由于
编辑：也许是takeUntil运算符？
答案 0 :(得分：1)
我在公司看到很多事情就是使用Rx Variable loginInFlight，Variable<boolean>就是class LoginViewController: UIViewController {
@IBOutlet weak var signInButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
...
// This commandAvailable is what I was talking about above
viewModel?
.loginCommandAvailable
.subscribe(onNext: {[unowned self] (available: Bool) in
self.signInButton.isEnabled = available
})
.addDisposableTo(disposeBag)
signInButton.rx.tap
.map {
// Send Login Command
return viewModel?.loginCommand()
}.subscribe(onNext: { (result: LoginResult)
// If result was successful we can send the user to the next screen
}).addDisposableTo(disposeBag)
}
}
。这默认为false，当命令运行登录时，我们将其翻转为true。此布尔值也与登录按钮绑定，因此一旦用户单击登录，任何后续点击都不会执行任何操作。您可以在用户可以点击某些内容来更改屏幕的位置实施此操作，以确保尚未有正在进行的通话/事件。
我们关注MVVM，所以这是一个基于此的例子。我试图只显示它下方的准系统，所以希望下面的一切仍然有意义。
enum LoginResult: Error {
case success
case failure
}
class LoginViewModel {
private let loginInFlight = Variable<Bool>(false)
private var emailAddressProperty = Variable<String>("")
var emailAddress: Driver<String> {
return emailAddressProperty
.asObservable()
.subscribeOn(ConcurrentDispatchQueueScheduler(queue: DispatchQueue.global()))
.asDriver(onErrorJustReturn: "")
}
...
var loginCommandAvailable: Observable<Bool> {
// We let the user login if login is not currently happening AND the user entered their email address
return Observable.combineLatest(emailAddressProperty.asObservable(), passwordProperty.asObservable(), loginInFlight.asObservable()) {
(emailAddress: String, password: String, loginInFlight: Bool) in
return !emailAddress.isEmpty && !password.isEmpty && !loginInFlight
}
}
func loginCommand() -> Driver<LoginResult> {
loginInFlight.value = true
// Make call to login
return authenticationService.login(email: emailAddressProperty.value, password: passwordProperty.value)
.map { result -> LoginResult in
loginInFlight.value = false
return LoginResult.success
}
}
}
class LoginViewController: UIViewController {
@IBOutlet weak var signInButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
...
// This commandAvailable is what I was talking about above
viewModel?
.loginCommandAvailable
.subscribe(onNext: {[unowned self] (available: Bool) in
self.signInButton.isEnabled = available
})
.addDisposableTo(disposeBag)
signInButton.rx.tap
.map {
return viewModel?.loginCommandAvailable
}.flatmap { (available: Bool) -> Observable<LoginResult>
// Send Login Command if available
if (available) {
return viewModel?.loginCommand()
}
}.subscribe(onNext: { (result: LoginResult)
// If result was successful we can send the user to the next screen
}).addDisposableTo(disposeBag)
}
}
2017-09-11 19:04:47,771 WARNING [javax.enterprise.resource.webcontainer.jsf.lifecycle] (default task-37) /welcomePrimefaces.xhtml @46,106 actionListener="#{controlador.testar()}": java.lang.IllegalStateException: Received object of type org.postgresql.util.PGobject: javax.el.ELException: /welcomePrimefaces.xhtml @46,106 actionListener="#{controlador.testar()}": java.lang.IllegalStateException: Received object of type org.postgresql.util.PGobject
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:111)
at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:147)
at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:814)
at javax.faces.component.UICommand.broadcast(UICommand.java:300)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:658)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:326)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:812)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalStateException: Received object of type org.postgresql.util.PGobject
at org.hibernate.spatial.dialect.postgis.PGGeometryTypeDescriptor.toGeometry(PGGeometryTypeDescriptor.java:123)
at org.hibernate.spatial.dialect.postgis.PGGeometryTypeDescriptor$2.doExtract(PGGeometryTypeDescriptor.java:87)
at org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:47)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:235)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:231)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:222)
at org.hibernate.type.AbstractStandardBasicType.hydrate(AbstractStandardBasicType.java:296)
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2840)
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1735)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1661)
at org.hibernate.loader.Loader.getRow(Loader.java:1550)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:733)
at org.hibernate.loader.Loader.processResultSet(Loader.java:978)
at org.hibernate.loader.Loader.doQuery(Loader.java:936)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)
at org.hibernate.loader.Loader.doList(Loader.java:2622)
at org.hibernate.loader.Loader.doList(Loader.java:2605)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2434)
at org.hibernate.loader.Loader.list(Loader.java:2429)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:501)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:371)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1339)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:87)
at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606)
at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:483)
at org.jboss.as.jpa.container.QueryNonTxInvocationDetacher.getResultList(QueryNonTxInvocationDetacher.java:58)
at br.gov.rio.iplanrio.projetox.controle.Controlador.testar(Controlador.java:121)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at javax.el.ELUtil.invokeMethod(ELUtil.java:311)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:415)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)
at com.sun.el.parser.AstValue.invoke(AstValue.java:285)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
... 49 more
2017-09-11 19:04:47,800 SEVERE [javax.enterprise.resource.webcontainer.jsf.context] (default task-37) java.lang.IllegalStateException: Received object of type org.postgresql.util.PGobject
at org.hibernate.spatial.dialect.postgis.PGGeometryTypeDescriptor.toGeometry(PGGeometryTypeDescriptor.java:123)
at org.hibernate.spatial.dialect.postgis.PGGeometryTypeDescriptor$2.doExtract(PGGeometryTypeDescriptor.java:87)
at org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:47)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:235)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:231)
at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:222)
at org.hibernate.type.AbstractStandardBasicType.hydrate(AbstractStandardBasicType.java:296)
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2840)
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1735)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:1661)
at org.hibernate.loader.Loader.getRow(Loader.java:1550)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:733)
at org.hibernate.loader.Loader.processResultSet(Loader.java:978)
at org.hibernate.loader.Loader.doQuery(Loader.java:936)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:342)
at org.hibernate.loader.Loader.doList(Loader.java:2622)
at org.hibernate.loader.Loader.doList(Loader.java:2605)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2434)
at org.hibernate.loader.Loader.list(Loader.java:2429)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:501)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:371)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1339)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:87)
at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606)
at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:483)
at org.jboss.as.jpa.container.QueryNonTxInvocationDetacher.getResultList(QueryNonTxInvocationDetacher.java:58)
at br.gov.rio.iplanrio.projetox.controle.Controlador.testar(Controlador.java:121)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at javax.el.ELUtil.invokeMethod(ELUtil.java:311)
at javax.el.BeanELResolver.invoke(BeanELResolver.java:415)
at javax.el.CompositeELResolver.invoke(CompositeELResolver.java:256)
at com.sun.el.parser.AstValue.invoke(AstValue.java:285)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:147)
at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88)
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:814)
at javax.faces.component.UICommand.broadcast(UICommand.java:300)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:658)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1508)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:326)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:812)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
答案 1 :(得分：0)
不是唯一的解决方案，但这似乎至少在推动表格视图选择的情况下运作良好。它使用takeUntil运算符来停止事件
myTableView.rx.itemSelected
.takeUntil(self.rx.methodInvoked(#selector(viewWillDisappear)))
.subscribe(onNext: { [weak self] indexPath in
self?.performSegue(withIdentifier: "MySegueIdentifier", sender: self)
)}
.dispose(by: self.myDisposeBag)
虽然请注意，如果您可以返回查看控制器，那么您可能需要重新订阅，可能是将订阅移至viewDidAppear。也许这是一种更有效的方法，但并不需要重新订阅。
另一个选项是take(1)而不是takeUntil(…)，但在返回视图控制器时仍需要重新订阅。