我目前正在重写部分Swift 1.2代码,以便与Swift 2.0兼容。实际上我无法弄清楚对“sendAsynchronousRequest”做了哪些更改 - 目前我的所有请求都失败了
NSURLConnection.sendAsynchronousRequest(request, queue: queue, completionHandler:{ (response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in})
无法使用类型的参数列表调用“sendAsynchronousRequest” '(NSURLRequest,队列:NSOperationQueue,completionHandler: (NSURLResponse!,NSData!,NSError!) - >空隙)'
你有什么想法有什么不对吗?
答案 0 :(得分:6)
使用Swift 1.2和Xcode 6.3,sendAsynchronousRequest:queue:completionHandler:
的签名是:
class func sendAsynchronousRequest(request: NSURLRequest,
queue: NSOperationQueue!,
completionHandler handler: (NSURLResponse!, NSData!, NSError!) -> Void)
然而,使用Swift 2和Xcode 7 beta,sendAsynchronousRequest:queue:completionHandler:
的签名已经改变,现在是:
// Note the non optionals, optionals and implicitly unwrapped optionals differences
class func sendAsynchronousRequest(request: NSURLRequest,
queue: NSOperationQueue,
completionHandler handler: (NSURLResponse?, NSData?, NSError?) -> Void)
因此,转到Swift 2和Xcode 7 beta,您将不得不更改completionHandler
参数实现,并确保您的queue
参数是非可选参数。
答案 1 :(得分:4)
似乎问题在于完成块中隐式解包的选项。只是让它可选,它应该可以正常工作,
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) { (response: NSURLResponse?, data: NSData?, error: NSError?) in
let string = NSString(data: data!, encoding: NSISOLatin1StringEncoding)
print("Response \(string!)")
}
答案 2 :(得分:2)
由于iOS 9中不推荐使用NSURLConnection.sendAsynchronousRequest
,因此应使用NSURLSession
public func dataTaskWithRequest(request: NSURLRequest, completionHandler: (NSData?, NSURLResponse?, NSError?) -> Void) -> NSURLSessionDataTask
答案 3 :(得分:0)
swift 3
let url:URL? = URL(string:location)
if url == nil {
print("malformed url : \(location)")
}
NSURLConnection.sendAsynchronousRequest(URLRequest(url:url!),
queue: OperationQueue.main)
{ (response: URLResponse?, data: Data?, error: Error?) -> Void in
}