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swift - 错误 - 无法在不可变值 : function call returns immutable value 上使用可变成员

所以我有这个自定义结构publicstructFeature{varfeatureID:String=""varfeatureName:String=""varmatchingFieldValue:String=""varpolygonCollection=[MyPolygon]()mutatingfuncsetFeatureID(featureID:String){self.featureID=featureID}funcgetMatchingFieldValue()->String{returnmatchingFieldValue}mutatingfuncsetMatchingFi

ue4 Create Process () return 570”

IhadtogotoEdit>Projectsettings>Packaging,thenscrolldowntothe“Project”tabandfind“FullRebuild”Tickthattotrueandthatfixedmyissue.我必须去编辑>项目设置>打包,然后向下滚动到“项目”选项卡并找到“完全重建”勾选为真,这解决了我的问题。 

hive报错:FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask.

使用hive创建表的时候报错:FAILED:ExecutionError,returncode1fromorg.apache.hadoop.hive.ql.exec.DDLTask.MetaException(message:Gotexception:java.net.ConnectExceptionCallFromnode01/192.168.126.100tonode01:9000failedonconnectionexception:java.net.ConnectException:Connectionrefused;Formoredetailssee: http://wiki.apa

ios - AVSpeechSynthesizer 错误 : An AVSpeechUtterance shall not be enqueued twice

我有点卡住了。这是我的代码:letspeaker=AVSpeechSynthesizer()varplayQueue=[AVSpeechUtterance]()//currentqueuevarbackedQueue=[AVSpeechUtterance]()//queuebackup...funcmoveBackward(_currentUtterance:AVSpeechUtterance){speaker.stopSpeaking(at:.immediate)letcurrentIndex=getCurrentIndexOfText(currentUtterance)//outo

ios - 快速翻转 View : issues with whole screen flipping + tap gesture only works twice

我想创建一个简单的翻转效果,但我不明白我这里遇到的问题:整个屏幕都在翻转,不仅仅是View,有没有办法只翻转100,100平方?我只能翻转两次,然后水龙头就不能用了,你知道为什么吗?importUIKitclassViewController:UIViewController{varfromOneToTwo:Bool=truevarview1:UIImageView!varview2:UIImageView!vartap:UITapGestureRecognizer!funchandleTap(tap:UITapGestureRecognizer){println("1/fromOne

swift - NSCalendar.startOfDayForDate(日期 :) equivalent for iOS 7 with non-optional return type

是否可以更改NSDate对象,使结果等同于NSCalendar.startOfDayForDate(date:)?该方法仅适用于iOS8及更高版本,但我正在寻找适用于iOS7的方法。我看过两种方法:NSCalendar.dateFromComponents(comps:)如下所述:NSDatebeginningofdayandendofday.例如,像这样:classfuncstartOfDay(date:NSDate,calendar:NSCalendar)->NSDate{if#available(iOS8,*){returncalendar.startOfDayForDate(d

iOS : Add a UIView returned by Braintree to the screen

我正在按照Braintree的指南将dropIn功能添加到iOS应用程序。为了显示dropIn,我使用以下方法:funcshowDropIn(clientTokenOrTokenizationKey:String){letrequest=BTDropInRequest()letdropIn=BTDropInController(authorization:clientTokenOrTokenizationKey,request:request){(controller,result,error)inif(error!=nil){print("ERROR")}elseif(result?

objective-c - Xcode 10.2 Swift 错误 : Function types cannot be represented in Objective-C unless their parameters and returns can be

我今天将Xcode更新到10.2,但出现以下错误:Methodcannotbemarked@objcbecausethetypeoftheparameter2cannotberepresentedinObjective-CFunctiontypescannotberepresentedinObjective-CunlesstheirparametersandreturnscanbeIdon'tunderstandwhy在10.1中完全没问题。这是我多年来一直使用的示例,没有任何问题。我怎样才能使这段代码无错误地编译?@objcpublicfuncmyFunction(inputStri

hive报错——FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.StatsTask

今天向分区表插入数据insertintotable--------的时候执行完报错了:FAILED:ExecutionError,returncode1fromorg.apache.hadoop.hive.ql.exec.StatsTask重启了电脑也没用,修改了yarn-site.xml和mapred-site.xml增加yarn和mapreduce可用内存都没用然后同学让我加了一句话setsethive.stats.column.autogather=false 执行这个以后再执行insert语句,就不报错,插入数据成功了!不过!!!需要注意的是,之前的insert语句虽然报错了,但是已经

SAP ABAP 释放 TR 遇到错误消息 ended with return code 8 的含义和处理办法

我的知识星球里有朋友提问:se09释放请求号报错:endedwithreturncode:===>8这是ABAPTransportRequest释放时的一个Generic错误消息。熟悉ABAP编程的朋友都知道,很多ABAP关键字执行后,通过系统变量sy-subrc的值来判断是否执行成功,0代表成功,4或者8代表失败。这个系统变量在笔者这篇ABAP教程里有详细介绍:ABAP编程语言中的系统字段(SystemFields)ABAP传输请求的释放也不例外。ABAPTransportRequest(ABAP传输请求)是SAP系统中用于将开发人员在开发系统中创建和修改的ABAP对象(例如程序、表、视图、