学习 swift 遇到的问题

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This topic created in 3730 days ago, the information mentioned may be changed or developed.

import UIKit

protocol HttpProtocol
{
func didReceiveResults(results:NSArray)
}

class HttpController:NSObject{
var delegate:HttpProtocol?

func onSearch(url:String){
    var nsUrl:NSURL = NSURL(string:url)!
    var request:NSURLRequest = NSURLRequest(URL:nsUrl)


    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(), completionHandler:{ (response:NSURLResponse!,data:NSData!,error:NSError!)
        -> Void in

            var httpResponse = response as! NSHTTPURLResponse
        if ( httpResponse.statusCode == 200){
            var array:NSArray =
          NSJSONSerialization.JSONObjectWithData (data,
            options : NSJSONReadingOptions.AllowFragments,
            error:nil) as! NSArray
            self.delegate?.didReceiveResults(array)
            }
    })

}

}

报错为：
1.Cannot convert value of type '(NSURLResponse!, NSData!, NSError!) -> Void' to expected argument type '(NSURLResponse?, NSData?, NSError?) -> Void'
2.Extra argument 'error' in call

折腾不下了，这个闭包不知道问题出在哪里。。。。

Supplement 1 · Mar 13, 2016

已解决(剩余一个警告)。
'sendAsynchronousRequest(_:queue:completionHandler:)' was deprecated in iOS 9.0: Use [NSURLSession dataTaskWithRequest:completionHandler:] (see NSURLSession.h

sendAsynchronousReques 被取代了。

9 replies • 2016-03-12 23:50:00 +08:00

finab

Mar 12, 2016 via iPhone

它需要一个可选值类型的参数，你给传了!，参数类型不匹配。你把你闭包的参数类型删掉就写个参数名就可以了

iAugus

Mar 12, 2016

简单的从语法上帮你改了下，另外
sendAsynchronousRequest(...) was deprecated in iOS 9.0

```
import UIKit

protocol HttpProtocol
{
func didReceiveResults(results:NSArray)
}

class HttpController:NSObject{
var delegate:HttpProtocol?

func onSearch(url: String){
let nsUrl = NSURL(string:url)!
let request = NSURLRequest(URL:nsUrl)

NSURLConnection.sendAsynchronousRequest(request, queue: .mainQueue()) { (response, data, error) -> Void in

guard let data = data, httpResponse = response as? NSHTTPURLResponse else { return }

if httpResponse.statusCode == 200 {

do {
let array = try NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments) as! NSArray
self.delegate?.didReceiveResults(array)
} catch {

}

}
}

}
}

iAugus

Mar 12, 2016

```

import UIKit

protocol HttpProtocol
{
func didReceiveResults(results:NSArray)
}

class HttpController:NSObject{
var delegate:HttpProtocol?

func onSearch(url: String){
let nsUrl = NSURL(string:url)!
let request = NSURLRequest(URL:nsUrl)

NSURLConnection.sendAsynchronousRequest(request, queue: .mainQueue()) { (response, data, error) -> Void in

guard let data = data, httpResponse = response as? NSHTTPURLResponse else { return }

if httpResponse.statusCode == 200 {

do {
let array = try NSJSONSerialization.JSONObjectWithData(data, options: .AllowFragments) as! NSArray
self.delegate?.didReceiveResults(array)
} catch {

}

}
}

}
}

iAugus

Mar 12, 2016

Sorry 代码片段怎么插入来着？无法格式化？你将就着看吧

iAugus

Mar 12, 2016

iAugus

Mar 12, 2016

好吧，我放弃了，不知道怎么插入代码片段。。。

kingcos

Mar 12, 2016 via iPhone

@iAugus 评论貌似不支持 markdown 。。

iAugus

Mar 12, 2016

@kingcos 原来如此 thanks

ICo

Mar 12, 2016

@finab
@iAugus
@kingcos
感谢你们的回复，，后来看了一些 stack overflow 就模仿改了一下
大概跟 @iAugus 的一样，，就是出现了 5 个警告⚠️。。。