我坚持如何正确使用Public Function ReturnXMLResponse(ByVal XML_Method As Variant, _
ByVal XML_Track_URL As Variant, _
ByVal XML_Request As Variant, _
Optional ByVal WaybillNum As String = "", _
Optional ByVal CarrierName As String = "", _
Optional ByVal TotalWaybills As Long = 0, _
Optional ByVal XML_Chunks As Long = 1) As String
' Passed expressions to this function have to be Variant, as some arguments
' may be passed as Null which would result in a type conversion failure.
' If True Then Exit Function
ReturnXMLResponse = "Test" ' default if not supported or not tracked by request
If UCase(XML_Track_URL) <> "NOT SUPPORTED" And UCase(XML_Track_URL) <> "NOT TRACKED BY REQUEST" Then
If (WaybillNum <> "") And (CarrierName <> "") Then
TrackingCounter = TrackingCounter + (1 / XML_Chunks)
SBText = "Tracking: " & CarrierName & ":" & WaybillNum
If TotalWaybills <> 0 Then SBText = SBText & " (" & CLng(TrackingCounter) & "/" & TotalWaybills & ") [" & (TrackingCounter / TotalWaybills) * 100 & "%]"
SBText = SBText & "."
Application.SysCmd acSysCmdSetStatus, SBText
End If
Set XMLHTTP = CreateObject("Microsoft.xmlhttp")
If (WaybillNum <> "") And (CarrierName <> "") Then
SBText = SBText & "."
Application.SysCmd acSysCmdSetStatus, SBText
End If
XMLHTTP.Open XML_Method, XML_Track_URL, False
If (WaybillNum <> "") And (CarrierName <> "") Then
SBText = SBText & "."
Application.SysCmd acSysCmdSetStatus, SBText
End If
XMLHTTP.Send XML_Request ' okay to send blank string, if not needed
If (WaybillNum <> "") And (CarrierName <> "") Then
SBText = SBText & "."
Application.SysCmd acSysCmdSetStatus, SBText
End If
ReturnXMLResponse = Cstr(XMLHttp.ResponseText)
End If
If ReturnXMLResponse = "" Then ReturnXMLResponse = "Nothing"
End Function
Basically XMLHTTP.Send XML_Request
'XMLHTTP.Send = Sending the XML_Request which is the soap envelope
above. It 'then returns the valid XML.
任务将J.S.Bach图像下载到URLSession。
这是UIImage内的代码。不会发生崩溃。程序永远不会到达最里面的if语句，而viewDidLoad仍然是空白的。
UIImageView答案 0 :(得分：3)
您正在尝试将网页加载到UIImage实例中。我怀疑您的URLRequest工作正常，但是if let bach行会因为您尝试使用某些HTML创建UIImage而窒息。我意识到维基百科URL在其路径扩展中有“.jpg”，但它仍指向HTML页面。
要解决您的问题，请尝试将网址更改为https://upload.wikimedia.org/wikipedia/commons/6/6a/Johann_Sebastian_Bach.jpg - 这就是您要查找的实际JPEG文件。