ios - 迁移到Swift 2时出错: Invalid conversion from throwing function of type to non-throwing function type and use of undeclared type

我正在尝试使用Swift 2语法来尝试...做...捕获错误处理，但是在尝试修改我的代码后，我遇到了一些我无法弄清的错误。在此先感谢您的帮助。

在dispatch_async行上，错误:从类型为(()的throwing函数的无效转换将throws->()'转换为非抛出函数类型为'dispatch_block_t'(aka'@convention(block)()->()')。

稍后在代码中，在“let resultArray.NSArray”上...我收到错误消息“使用未声明的类型NSArray”。

func searchFlickrForString(searchStr:String, completion:(searchString:String!, FlickrPhotos:NSMutableArray!, error:NSError!)->()){
    let searchURL:String = FlickrHelper.URLForSearchString(searchStr)

    let queue:dispatch_queue_t = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)

    dispatch_async(queue, {

        var error:NSError?

        let searchResultString:String! = try String(contentsOfURL: NSURL(fileURLWithPath: searchURL), encoding: NSUTF8StringEncoding)
        do {
            // Parse JSON Response
            let jsonData:NSData! = searchResultString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)

            let resultDict:NSDictionary! = try NSJSONSerialization.JSONObjectWithData(jsonData, options: []) as! NSDictionary
            do {
                let status:String = resultDict.objectForKey("stat") as! String
                if status ==  "fail" {
                    let error:NSError? = NSError(domain: "FlickrSearch", code: 0, userInfo: [NSLocalizedFailureReasonErrorKey:resultDict.objectForKey("message")!])

                    completion(searchString: searchStr, FlickrPhotos:  nil, error: error)
                } else {
                    let resultArray:NSArrray = resultDict.objectForKey("photos").objectForKey("photo") as NSArray

                    let flickrPhotos:NSMutableArray = NSMutableArray()

                    for photoObject in resultArray{
                        let photoDict:NSDictionary = photoObject as NSDictionary

                        var flickrPhoto:FlickrPhoto = FlickrPhoto()
                        flickrPhoto.farm = photoDict.objectForKey("farm") as Int
                        flickrPhoto.server = photoDict.objectForKey("farm") as String
                        flickrPhoto.secret = photoDict.objectForKey("farm") as String
                        flickrPhoto.photoID = photoDict.objectForKey("farm") as String

                        let searchURL:String = FlickrHelper.URLForFlickrPhoto(flickrPhoto, size: "m")
                        //download image
                        let imageData:NSData = NSData(contentsOfURL: searchURL, options: nil)

                    }
                }
            } catch let error as NSError{
                completion(searchString: searchStr, FlickrPhotos: nil, error: error)
            }
        } catch {
            //completion(searchString: searchStr, FlickrPhotos: nil, error: error)
        }


    })

}

}

最佳答案

要解决第一个错误，请先移动第一个

do {

直属

dispatch_async(queue

对于第二个错误:将代码更改为

let resultArray = resultDict.objectForKey("photos")!.objectForKey("photo") as! NSArray

同时用“as”替换每个“as”!

将searchURL声明更改为:

let searchURL = NSURL(string: FlickrHelper.URLForFlickrPhoto(flickrPhoto, size: "m"))

关于ios - 迁移到Swift 2时出错: Invalid conversion from throwing function of type to non-throwing function type and use of undeclared type，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/35465226/