xcode 调用中的额外参数“错误”。Swift 2.0 中的编译错误
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Extra argument 'error' in call. Compilation error in Swift 2.0
提问by user4657
I am currently trying to learn about Swift 2.0 and OAuth integration via this sample application: https://github.com/soundcloud/iOSOAuthDemo
我目前正在尝试通过此示例应用程序了解 Swift 2.0 和 OAuth 集成：https: //github.com/soundcloud/iOSOAuthDemo
The following snippet below is causing me problems and causing the application to fail in its compilation.
下面的以下代码段给我带来了问题，并导致应用程序在编译时失败。
private func requestMe(token: String) {
let url = NSURL(string: "https://api.soundcloud.com/me.json?oauth_token=\(token)")!
let request = NSURLRequest(URL: url)
let session = NSURLSession(configuration: NSURLSessionConfiguration.defaultSessionConfiguration(),
delegate: nil, delegateQueue: NSOperationQueue.mainQueue())
let dataTask = session.dataTaskWithURL(url) { (data, response, error) -> Void in
if let jsonOutput = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: nil) as? [String:AnyObject] {
self.displayMe(jsonOutput)
}
}
dataTask.resume()
}
However when compiling my error handling looks as though it has changed in this version of Swift (2.0) and is causing the following error:
但是，在编译我的错误处理时，它似乎在此版本的 Swift (2.0) 中发生了变化，并导致以下错误：
Extra argument 'error' in call with the compilation.
编译时调用的额外参数“错误”。
I have reviewed the following stack posting on this issue: Swift: Extra argument 'error' in call
我已经查看了有关此问题的以下堆栈发布：Swift: Extra argument 'error' in call
and adjusted my code to try and correct the error handling as such:
并调整了我的代码以尝试更正错误处理：
let dataTask = session.dataTaskWithURL(url) { (data, response, error) -> Void in
if let jsonOutput = NSJSONSerialization.JSONObjectWithData(data, options: nil) as? [String:AnyObject] {
self.displayMe(jsonOutput)
}
}
catch let error as NSError {
print(error);}
dataTask.resume()
}
I have also tried changing:
我也试过改变：
(data, options: nil, error: nil)
to
到
(data:NSData?, error:NSError?)
However neither of these resolving the issue. Can someone guide me as to what is probably a silly mistake I am making with this error handling.
然而，这些都没有解决问题。有人可以指导我了解我在此错误处理中犯的一个愚蠢的错误。
Thanks in advance!,
提前致谢！，
回答by Eric Aya
There were several problems with your code: you added catchbut forgot doand try. Also you can't pass nilas an option parameter anymore for NSJSONSerialization, and you have to safely unwrap the dataoptional.
您的代码有几个问题：您添加catch但忘记了do和try。此外，您不能nil再将 NSJSONSerialization 作为选项参数传递，并且您必须安全地解开data可选参数。
Here's a fixed version:
这是一个固定版本：
let dataTask = session.dataTaskWithURL(url) { (data, response, error) -> Void in
do {
if let myData = data, let jsonOutput = try NSJSONSerialization.JSONObjectWithData(myData, options: []) as? [String:AnyObject] {
self.displayMe(jsonOutput)
}
} catch let error as NSError {
print(error)
}
}
dataTask.resume()
