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swift - 如何在 'pure' Swift 中创建一个弱协议(protocol)引用(没有@objc)

weak引用在Swift中似乎不起作用,除非将protocol声明为@objc,我不希望这样纯Swift应用。此代码给出编译错误(weakcannotbeappliedtonon-classtypeMyClassDelegate):classMyClass{weakvardelegate:MyClassDelegate?}protocolMyClassDelegate{}我需要在协议(protocol)前加上@objc,然后它就可以工作了。问题:完成弱delegate的“纯”Swift方法是什么? 最佳答案 您需要将协议(proto

Objects are trying to be loaded during a domain backup. This is not allowed as it will lead to undef

 UNITY运行时报错Objectsaretryingtobeloadedduringadomainbackup.Thisisnotallowedasitwillleadtoundefinedbehaviour!解决方法是关闭在编辑器中打开的SHADERGRAPH窗口 

Property xxx was accessed during render but is not defined on instance. 和 ResizeObserver loop limit

问题出现,在Vue3中引入了elementui相关报错关于今天在Vue3中遇到的Property"size"wasaccessedduringrenderbutisnotdefinedoninstance.然后还报错了ResizeObserverlooplimit/(ㄒoㄒ)/~~出现的报错意思是"属性'xxx(size)'在渲染期间被访问,但未在实例上定义"引入elementui中Vue3template里的相关代码 解决方案(☆▽☆)只需要在对应的组件中在实例中定义即可😊import{ref}from'vue'exportdefault{name:'MyProject',setup(){c

启动kafka报错ERROR Fatal error during KafkaServer startup. Prepare to shutdown ,找到原因就要可以解决

一、错误报的错:ERRORFatalerrorduringKafkaServerstartup.Preparetoshutdown(kafka.server.KafkaServer)kafka.common.InconsistentBrokerIdException:Configuredbroker.id0doesn’tmatchstoredbroker.idSome(1)inmeta.properties.Ifyoumovedyourdata,makesureyourconfiguredbroker.idmatches.Ifyouintendtocreateanewbroker,yousho

启动kafka报错ERROR Fatal error during KafkaServer startup. Prepare to shutdown ,找到原因就要可以解决

一、错误报的错:ERRORFatalerrorduringKafkaServerstartup.Preparetoshutdown(kafka.server.KafkaServer)kafka.common.InconsistentBrokerIdException:Configuredbroker.id0doesn’tmatchstoredbroker.idSome(1)inmeta.properties.Ifyoumovedyourdata,makesureyourconfiguredbroker.idmatches.Ifyouintendtocreateanewbroker,yousho

C# - 连接 : keep-alive Header is Not Being Sent During HttpWebRequest

我正在尝试使用我的HttpWebRequest发送以下header:连接:保持事件状态但是,header永远不会发送。Fiddler2显示每当我在GoogleChrome中请求页面时,都会发送header。但是,我的应用程序出于某种原因拒绝发送此header。我已将KeepAlive属性设置为true(默认情况下它是true),但header仍然没有发送。我试图用多个HttpWebRequests发送这个header,但它们基本上都是这样的:HttpWebRequestlogIn6=(HttpWebRequest)WebRequest.Create(newUri(responseFro

C# - 连接 : keep-alive Header is Not Being Sent During HttpWebRequest

我正在尝试使用我的HttpWebRequest发送以下header:连接:保持事件状态但是,header永远不会发送。Fiddler2显示每当我在GoogleChrome中请求页面时,都会发送header。但是,我的应用程序出于某种原因拒绝发送此header。我已将KeepAlive属性设置为true(默认情况下它是true),但header仍然没有发送。我试图用多个HttpWebRequests发送这个header,但它们基本上都是这样的:HttpWebRequestlogIn6=(HttpWebRequest)WebRequest.Create(newUri(responseFro

ImportError: ERROR: recursion is detected during loading of “cv2“ binary extensions. Check OpenCV in

1.importcv2错误ImportError:ERROR:recursionisdetectedduringloadingof“cv2”binaryextensions.CheckOpenCVinstallation.2.解决cv2版本太高,需要降低cv2版本2.1在anaconda环境下使用condalist查看当前cv2的版本为4.6.0.66,如下图:2.2使用pipuninstallopencv-python==4.6.0.66(指定卸载的当前cv2版本号)2.3安装低版本的cv2:pipinstallopencv-python=4.5.3.56(指定低版本的cv2版本号)2.4检

maven编译failed to transfer from http://0.0.0.0/ during a previous attempt.

Causedby:org.eclipse.aether.resolution.ArtifactResolutionException:com.sitech.cmap:platform-top:pom:3.2.5-SNAPSHOTfailedtotransferfromhttp://0.0.0.0/duringapreviousattempt.Thisfailurewascachedinthelocalrepositoryandresolutionisnotreattempteduntiltheupdateintervalofmaven-default-http-blockerhaselapse

链接KAFKA异常:Authentication failed during authentication due to invalid credentials with SASL mechanism

使用带kerberos认证的Kafka客户端链接kafka创建topic出现如下异常:AuthenticationfailedduringauthenticationduetoinvalidcredentialswithSASLmechanism。kafkaserver后台只有如下异常信息:Failed authenticationwith/192.168.0.1 (AuthenticationfailedduringauthenticationduetoinvalidcredentialswithSASLmechanismGSSAPI)(org.apache.kafka.common.net