我試圖根據教程我在網上找到(https://www.raywenderlich.com/85528/user-accounts-ios-ruby-rails-swift#next_section)創建NSURLSession任務,我收到以下錯誤:雨燕1.2以SWIFT 2:無法將類型的價值預期參數類型
Cannot convert value of type '(NSData!, NSURLResponse!, NSError!) ->()' to expected argument type '(NSData?, NSURLResponse?, NSError?) -> Void
在這個代碼塊:
let task = session.dataTaskWithRequest(request) { (data: NSData!, response: NSURLResponse!, error: NSError!) in
當問題屬於可以在這裏找到
func sendRequest(request: NSURLRequest, completion:(NSData!, NSError!) -> Void) ->() {
// Create a NSURLSession task
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithRequest(request) { (data: NSData!, response: NSURLResponse!, error: NSError!) in
if error != nil {
dispatch_async(dispatch_get_main_queue(), {() -> Void in
completion(data, error)
})
return
}
dispatch_async(dispatch_get_main_queue(), {() -> Void in
if let httpResponse = response as? NSHTTPURLResponse {
if httpResponse.statusCode == 200 {
completion(data, nil)
} else {
var jsonerror:NSError?
if let errorDict = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.AllowFragments, error:&jsonerror) as? NSDictionary {
let responseError : NSError = NSError(domain: "HTTPHelperError", code: httpResponse.statusCode, userInfo: errorDict as? [NSObject : AnyObject])
completion(data, responseError)
}
}
}
})
}
功能
完整的代碼塊可以在這裏(https://codeshare.io/uJPcX)在用線或data
等response
時進一步下跌,你發現68
嘗試改變'數據:NSData !,響應:NSURLResponse !,錯誤:NSError!'到'data:NSData ?,響應:NSURLResponse? ,錯誤:NSError?' – Fonix
這個伎倆!謝謝@Fonix – noobdev
沒問題:),你應該查看可選變量的工作方式,以充分理解它們之間的區別!和?在迅速,以後也使用任何這些參數可能需要一個!在他們之後(和一些空的檢查) – Fonix