草庐IT

swift 3 :fatal error: Double value cannot be converted to Int because it is either infinite or NaN

当我调用这个方法时,收到一个错误。如何在分配给小时、分钟或秒时处理NaN或无限值?这是我的代码:privatefuncsecondsToFormattedString(totalSeconds:Float64)->String{lethours:Int=Int(totalSeconds.truncatingRemainder(dividingBy:86400)/3600)letminutes:Int=Int(totalSeconds.truncatingRemainder(dividingBy:3600)/60)letseconds:Int=Int(totalSeconds.trunc

iOS 在 Instagram 上的分享 : The file couldn’t be saved because the specified URL type isn’t supported

我有以下代码可以在swift3iOS10.1中在Instagram上分享图片:funcshareOnInstagram(_photo:UIImage,text:String?){letinstagramUrl=URL(string:"instagram://app")!ifUIApplication.shared.canOpenURL(instagramUrl){letimageData=UIImageJPEGRepresentation(photo,1.0)!letcaptionString=text??""letwritePath=URL(string:NSTemporaryDir

ios - NSKeyValueObservation : Cannot remove an observer for the key path from object because it is not registered as an observer

我的应用出现随机崩溃(我无法在我拥有的设备上重现),但有以下异常(exception):CannotremoveanobserverFoundation.NSKeyValueObservation0xaddressforthekeypath"readyForDisplay"fromAVPlayerLayer0xaddressbecauseitisnotregisteredasanobserver.当我释放一个包含AVPlayerLayer的UIView时会发生这种情况。我的初始化:privatevarplayerLayer:AVPlayerLayer{returnself.layera

ios - "The data couldn’ t be read because it is missing”在Swift中解码JSON时出错

我收到以下错误:无法读取数据,因为它丢失了。当我运行以下代码时:structIndicator:Decodable{letsection:Stringletkey:Intletindicator:Intletthreshold:Int}varindicators=[Indicator]()do{ifletfile=Bundle.main.url(forResource:"indicators",withExtension:"json"){indicators=tryJSONDecoder().decode([Indicator].self,from:tryData(contentsOf

swift - "Protocol ... can only be used as a generic constraint because it has Self or associated type requirements"是什么意思?

我正在尝试创建一个以Swift中的自定义协议(protocol)为键的字典(实际上是一个HashSet),但它在标题中给出了错误:Protocol'myProtocol'canonlybeusedasagenericconstraintbecauseithasSelforassociatedtyperequirements而且我无法理解它的正反面。protocolObserving:Hashable{}varobservers=HashSet() 最佳答案 协议(protocol)Observing继承自协议(protocol)Ha

c# - 无效操作异常 : Cannot create a DbSet for 'Role' because this type is not included in the model for the context

以下解决方案适用于.netcore1.1,但从1.1升级到2.0后,我收到以下错误:InvalidOperationException:CannotcreateaDbSetfor'Role'becausethistypeisnotincludedinthemodelforthecontext.当用户尝试登录并执行以下语句时:varresult=await_signInManager.PasswordSignInAsync(model.Email,model.Password,model.RememberMe,lockoutOnFailure:false);怎么了?User.cspubl

c# - "A connection attempt failed because the connected party did not properly respond after a period of time"使用 WebClient

我正在使用以下在本地机器上运行的代码,但是当我在服务器上尝试相同的代码时它会抛出错误Aconnectionattemptfailedbecausetheconnectedpartydidnotproperlyrespondafteraperiodoftime,orestablishedconnectionfailedbecauseconnectedhosthasfailedtorespond这是我的代码:WebClientclient=newWebClient();//Addauseragentheaderincasethe//requestedURIcontainsaquery.//

c# - 生成错误 : "The process cannot access the file because it is being used by another process"

我有一个C#webforms应用程序,直到今天它一直运行顺畅。现在,突然之间,每次我尝试运行该应用程序时,我都会收到文件锁定错误:Unabletocopyfile"obj\Debug\MyProject.exe"to"bin\Debug\MyProject.exe".Theprocesscannotaccessthefile"bin\Debug\MyProject.exe"becauseitisbeingusedbyanotherprocess.谷歌搜索错误并没有发现明显的错误,即VS认为文件已锁定。绝对锁定文件的是VisualStudio本身,因为当我关闭VS并重新打开它时,项目执行

c# - "The Controls collection cannot be modified because the control contains code blocks"

我正在尝试创建一个简单的用户控件,它是一个slider。当我将AjaxToolkitSliderExtender添加到用户控件时,我得到这个(*&$#()@#error:ServerErrorin'/'Application.TheControlscollectioncannotbemodifiedbecausethecontrolcontainscodeblocks(i.e.``).Description:Anunhandledexceptionoccurredduringtheexecutionofthecurrentwebrequest.Pleasereviewthestackt

javascript - VS 代码 : "Breakpoint ignored because generated code not found" error

我到处都看过,但在VSCode中调试TypeScript时仍然遇到问题。我读过this线程,但我仍然无法命中我放置在TypeScript文件中的断点,命中.js文件中的断点一切正常。这是我设置的最简单的“helloworld”项目。应用.ts:varmessage:string="HelloWorld";console.log(message);tsconfig.json{"compilerOptions":{"target":"es5","sourceMap":true}}启动.json{"version":"0.2.0","configurations":[{"name":"Lau