Ios Swift:致命错误:在展开可选值时意外发现nil
我试图访问RESTWeb服务,但它给出了一个致命错误:在展开可选值时意外地发现了nil 下面是代码-我有一个RESTParser类-Ios Swift:致命错误:在展开可选值时意外发现nil,ios,web-services,swift,rest,Ios,Web Services,Swift,Rest,我试图访问RESTWeb服务,但它给出了一个致命错误:在展开可选值时意外地发现了nil 下面是代码-我有一个RESTParser类- protocol RESTParserDelegate { func getReceiveData(data:NSMutableData,sender:RESTParser) } class RESTParser: NSObject, NSURLConnectionDataDelegate { var receiveData: NSMutableDa
protocol RESTParserDelegate
{
func getReceiveData(data:NSMutableData,sender:RESTParser)
}
class RESTParser: NSObject, NSURLConnectionDataDelegate
{
var receiveData: NSMutableData!
var requestConnection: NSURLConnection!
var delegate: RESTParserDelegate?
func receiveData(resData:NSMutableData){
receiveData = resData
}
func requestConnection(reqConn:NSURLConnection){
requestConnection = reqConn
}
func httpRequest(myRequest:NSMutableURLRequest){
self.requestConnection = NSURLConnection(request: myRequest, delegate: self)
}
// NSURLConnectionDataDelegate methods
func connection(connection: NSURLConnection, didReceiveData data: NSData){
self.receiveData?.appendData(data)
}
func connectionDidFinishLoading(connection: NSURLConnection){
self.delegate?.getReceiveData(receiveData, sender: self) // error @ this line
self.delegate = nil
self.receiveData = nil
self.requestConnection = nil
}
func connection(connection: NSURLConnection, didFailWithError error: NSError){
NSLog("Failed with error - %@ ",error.localizedDescription)
}
func parseData(data:NSMutableData){
}
}
错误为ConnectiondFinishLoading函数中的@this line-self.delegate?.getReceiveData(receiveData,发件人:self) 并从我的项目详细信息视图控制器调用它-但一旦调用getReceiveData方法,就会出现致命错误
class ProjectDetails_tab: UIViewController, RESTParserDelegate{
override func viewDidLoad() {
super.viewDidLoad();
//var projectData: NSDictionary = [String:String]()
var url:String = "http://domianName.com"
var nsURL = NSURL(string: url)
var createrequest: NSMutableURLRequest = NSMutableURLRequest(URL: nsURL!)
createrequest.HTTPMethod = "GET"
var rest = RESTParser()
rest.delegate=self
rest.httpRequest(createrequest)
}
func getReceiveData(data:NSMutableData,sender:RESTParser){
}
}
不清楚代码的哪一行出现了致命错误。但您可以重新检查代理对象,或者:
// NSURLConnectionDataDelegate methods
func connection(didReceiveResponse: NSURLConnection, didReceiveResponse response: NSURLResponse) {
// Recieved a new request, clear out the data object
self.receiveData = NSMutableData()
}
func connection(connection: NSURLConnection, didReceiveData data: NSData){
self.receiveData?.appendData(data)
}
func connectionDidFinishLoading(connection: NSURLConnection!) {
// Request complete, self.data should now hold the resulting info
}
在哪一行上出现此错误…放置一些断点并检查…错误是ConnectiondFinishLoading函数中的@this line-self.delegate?.getReceiveData(receiveData,sender:self)。错误是ConnectiondFinishLoading函数中的@this line-self.delegate?.getReceiveData(receiveData,sender:self)。并且委托方法定义没有!,仍在尝试,但无法解决此问题,因为“receiveData”对象为零。您必须初始化消息“connection(didReceiveResponse:NSURLConnection,didReceiveResponse响应:NSURLResponse)”中的对象,请参见我编辑的答案中的第一个函数