从URL Swift

Question

以下代码适用于从网址下载单个图片。

    func imageForImageURLString(imageURLString: String, completion: (image: UIImage?, success: Bool) -> Void) {
    guard let url = NSURL(string: imageURLString),
        let data = NSData(contentsOfURL: url),
        let image = UIImage(data: data)
        else {
            completion(image: UIImage(named:"absolut5.png"), success: false);
            return
    }
    completion(image: image, success: true)
}

但是我正在使用的一些网址是一个压缩文件夹，里面有几个png文件。 所以我调整了上面的代码来恢复数据。这似乎有效

func dataForDataURLString(imageURLString: String, completion: (data: NSData?, success: Bool) -> Void) {
    guard let url = NSURL(string: imageURLString),
        let data = NSData(contentsOfURL: url)
        else {
            return
    }
    completion(data: data, success: true)
}

使用

let imageUrlString = item.valueForKey(url) as! String
self.dataForDataURLString(imageUrlString, completion: { (data, success) -> Void in
    if success {
       guard let dataDocs = data
          else { return } // Error handling here
            documentData = dataDocs
      } else {
          // Error handling here.
      }
    })

但是我没有找到解压缩/循环返回数据内容的任何内容。它不是JSON格式，只是打印时的数字原始数据字符串。

任何帮助都会受到赞赏（可能值得一提的是，我在后台NSOperationQueue中完成所有这些操作，完成块将结果保存在核心数据中。我已经查看了几个NSURLSessionDownloadTask选项，但这些似乎是一个不同的主题，但仍然没有工作）

Answer 1

发布我带的

解决方案

func unzipData(objectData: NSManagedObject) {
    var paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
    let documentsDir = paths[0]
    let zipPath = documentsDir.stringByAppendingString("MyZipFiles")
    let folderPath = documentsDir.stringByAppendingString("/docLibFiles") // My folder name in document directory
    var optData = NSData(data: objectData.valueForKey("image") as! NSData)
    print(objectData.valueForKey("imageUrl") as! String)
    optData.writeToFile(zipPath, atomically: true)
    let success = fileManager.fileExistsAtPath(zipPath) as Bool
    if success == false {
        do {
            try! fileManager.createDirectoryAtPath(folderPath, withIntermediateDirectories: true, attributes: nil)
        }
    }
    queue.addOperationWithBlock { () -> Void in
        let operation1 = NSBlockOperation(block: {
            let unZipped = SSZipArchive.unzipFileAtPath(zipPath, toDestination: folderPath)

        })
        operation1.completionBlock = {
            if queue.operationCount == 0 {
                dispatch_async(dispatch_get_main_queue(), {
                    if queue.operationCount == 0 {
                        self.retrieveFiles()
                    }
                })
            }
        }
        queue.addOperation(operation1)

    }
}

func getDocumentsURL() -> NSURL {
    let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
    return documentsURL
}

func fileInDocumentsDirectory(filename: String) -> String {
    let fileURL = getDocumentsURL().URLByAppendingPathComponent(filename)
    return fileURL.path!
}

func retrieveFiles() {
    var paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
    let documentsDir = paths[0]
    let zipPath = documentsDir.stringByAppendingString("MyZipFiles")
    let folderPath = documentsDir.stringByAppendingString("/docLibFiles") // My folder name in document directory
    do {
        let filelist = try fileManager.contentsOfDirectoryAtPath(folderPath)
        print(filelist)
        print("filename")
        for filename in filelist {

            fileNameArray.append(filename)
        }
    } catch let error as NSError  {
        print("Could not save \(error)")
    }
    do {
        for item in fileNameArray {
            print("item \(item)")
            let imagePath = fileInDocumentsDirectory("docLibFiles/\(item)")
            imageArray.append(UIImage(contentsOfFile: imagePath)!)
        }
        print("filename array \(fileNameArray)")
        print("image array \(imageArray)")
        unzipDelegate!.unzipSet(imageArray)
    }
}