0
Value of optional type 'NSURL?' not unwrapped; did you mean to use '!' or '?'?
當我進入"!"
或"?"
我的應用程序編譯失敗。 此代碼在特立獨行的工作,但由於我更新到優勝美地我得到一個錯誤。 我相信它的語法錯誤,但我找不到解決方案。Swift NSURLSession |的Xcode 6.1
import UIKit
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
var url = NSURL(string: "http://www.stackoverflow.com")
let task = NSURLSession.sharedSession().dataTaskWithURL(url) {(data, response, error) in
println(NSString(data: data, encoding:NSUTF8StringEncoding))
}