我有一个应用程序可以为我的应用程序上的每张票创建一个独特的照片库。我需要弄清楚如何遍历该画廊，以便我可以一次将图像上传到服务器。我在 youtube 上关注了这些教程。 ( Video ) 我目前使用 Swift 作为我的语言。我的最终目标是拥有类似于以下伪代码的内容。

//I need the following for loop example
for photo in gallery
{
    uploadToServer(photo)
}

//this function works already

func uploadToServer(photo:UIImage)
{
    callRest
    postPhoto
}

这是我的代码，到目前为止无法弄清楚如何循环。

let fetchOptions = PHFetchOptions()
fetchOptions.predicate = NSPredicate(format: "title = %@", self.albumName)?
let collection:PHFetchResult = PHAssetCollection.fetchAssetCollectionsWithType(.Album, subtype: .Any, options: fetchOptions)

if let first_Obj:AnyObject = collection.firstObject{
    //found the album
    self.assetCollection = collection.firstObject as PHAssetCollection
    self.albumFound = true
}
else { albumFound = false }
var i = collection.count
self.photoAssets = PHAsset.fetchAssetsInAssetCollection(self.assetCollection, options: nil)


self.photoAssets.enumerateObjectsUsingBlock{(object: AnyObject!,
    count: Int,
    stop: UnsafeMutablePointer<ObjCBool>) in

    if object is PHAsset{
        let asset = object as PHAsset
        println("Inside  If object is PHAsset, This is number 1")

        let imageSize = CGSize(width: asset.pixelWidth,
            height: asset.pixelHeight)

        /* For faster performance, and maybe degraded image */
        let options = PHImageRequestOptions()
        options.deliveryMode = .FastFormat

        imageManager.requestImageForAsset(asset,
            targetSize: imageSize,
            contentMode: .AspectFill,
            options: options,
            resultHandler: {
                (image, info)->Void in

                self.photo = image

                var defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
                var server = defaults.objectForKey("imageServer") as String!
                var error: NSError? = nil

                var imageData = UIImageJPEGRepresentation(self.photo, 90)
                var url = NSURL(string: server)
                var request = NSMutableURLRequest(URL: url!)
                request.HTTPMethod = "POST"
                //request.setValue("multipart/form-data", forHTTPHeaderField: "Content-Type")
                request.HTTPBody = imageData

                var response: NSURLResponse? = nil

                let reply = NSURLConnection.sendSynchronousRequest(request, returningResponse:&response, error:&error)

                let results = NSString(data:reply!, encoding:NSUTF8StringEncoding)
                println("API Response: \(results)")

                /*
                /* The image is now available to us */
                self.sendPhotos(image)
                println("enum for image, This is number 2")*/


        })
    }
}

最佳答案

因此，在 Matt 的一些研究和指导之后，我弄明白了。这是如何做到这一点。确保你也在主线程上执行它，所以你必须设置 options.synchronous = true。如果不是出于某种原因，它对照片没有任何值(value)。

func getSyncPhotos()
{
    self.albumName = String(self.ticket_id!)

    let fetchOptions = PHFetchOptions()
    fetchOptions.predicate = NSPredicate(format: "title = %@", self.albumName)?
    let collection:PHFetchResult = PHAssetCollection.fetchAssetCollectionsWithType(.Album, subtype: .Any, options: fetchOptions)

    if let first_Obj:AnyObject = collection.firstObject{
        //found the album
        self.assetCollection = collection.firstObject as PHAssetCollection
        self.albumFound = true
    }
    else { albumFound = false }
    var i = collection.count
    self.photoAssets = PHAsset.fetchAssetsInAssetCollection(self.assetCollection, options: nil)
    let imageManager = PHCachingImageManager()

    self.photoAssets.enumerateObjectsUsingBlock{(object: AnyObject!,
        count: Int,
        stop: UnsafeMutablePointer<ObjCBool>) in

        if object is PHAsset{
            let asset = object as PHAsset
            println("Inside  If object is PHAsset, This is number 1")

            let imageSize = CGSize(width: asset.pixelWidth,
                height: asset.pixelHeight)

            /* For faster performance, and maybe degraded image */
            let options = PHImageRequestOptions()
            options.deliveryMode = .FastFormat
            options.synchronous = true
            imageManager.requestImageForAsset(asset,
                targetSize: imageSize,
                contentMode: .AspectFill,
                options: options,
                resultHandler: {
                     image, info in
                    self.photo = image!
                    /* The image is now available to us */
                    self.sendPhotos(self.photo)
                    println("enum for image, This is number 2")


            })
        }
    }
}

func sendPhotos(uploadImage:UIImage)
{

    var defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
    var server = defaults.objectForKey("imageServer") as String!
    var error: NSError? = nil

    var imageData = UIImageJPEGRepresentation(uploadImage, 90)
    var url = NSURL(string: server)
    var request = NSMutableURLRequest(URL: url!)
    request.HTTPMethod = "POST"
    //request.setValue("multipart/form-data", forHTTPHeaderField: "Content-Type")
    request.HTTPBody = imageData

    var response: NSURLResponse? = nil

    let reply = NSURLConnection.sendSynchronousRequest(request, returningResponse:&response, error:&error)

    let results = NSString(data:reply!, encoding:NSUTF8StringEncoding)
    println("API Response: \(results)")
}

关于ios - 如何使用照片框架快速循环浏览照片库，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28885391/