如何上傳從UIImagePickerController中獲取的圖像

Question

用戶使用UIImagePickerController從iPhone庫中選擇圖像后，我想使用ASIHTTPRequest庫將其上傳到我的服務器。

我知道使用ASIHTTPRequest我可以使用文件的URl上傳文件，但是如何獲取圖像URL？

我知道我可以得到圖像UIImagePickerControllerReferenceURL ，看起來像這樣：

"assets-library://asset/asset.JPG?id=F2829B2E-6C6B-4569-932E-7DB03FBF7763&ext=JPG"

這是我需要使用的URL嗎？

Answer 1

有兩種方法

1：

您可以使用imagePickerController委托上傳圖像

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{   

    UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];
    //Upload your image
}

2：

您可以保存已挑選的圖像網址，然后使用此功能上傳

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

    NSString *imageUrl = [NSString stringWithFormat:@"%@",[info valueForKey:UIImagePickerControllerReferenceURL]];
    //Save the imageUrl
}

-(void)UploadTheImage:(NSString *)imageUrl{

 NSURL *url = [[NSURL alloc] initWithString:imageUrl];
 typedef void (^ALAssetsLibraryAssetForURLResultBlock)(ALAsset *asset);
 typedef void (^ALAssetsLibraryAccessFailureBlock)(NSError *error);    

 ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset){

  ALAssetRepresentation *rep = [myasset defaultRepresentation];
  CGImageRef iref = [rep fullResolutionImage];
  UIImage *myImage = nil;   

  if (ref) {
      myImage = [UIImage imageWithCGImage:iref scale:[rep scale] orientation:(UIImageOrientation)[rep orientation]];

        //upload the image   
     }      
  };      

  ALAssetsLibraryAccessFailureBlock failureblock  = ^(NSError *myerror){

  };          


  ALAssetsLibrary* assetslibrary = [[[ALAssetsLibrary alloc] init] autorelease];
 [assetslibrary assetForURL:url resultBlock:result block failureBlock:failureblock];    

}

注意：在使用ARC.Better將ALAssetsLibrary對象用作單例時，請確保ALAssetsLibrary對象的范圍。

Answer 2

將照片保存在文檔目錄中並使用該URL上傳。例如

NSString *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.jpg"];
[UIImageJPEGRepresentation(img, 1.0) writeToFile:jpgPath atomically:YES];

將此圖像上傳為[request setFile:jpgPath forKey:@"image"] ;

Answer 3

有許多答案表明UIImageJPEGRepresentation或UIImagePNGRepresentation。 但是這些解決方案將轉換原始文件，而這個問題實際上是關於按原樣保存文件。

看起來直接從資產庫上傳文件是不可能的。 但是可以使用PHImageManager訪問它以獲取實際的圖像數據。 這是如何做：

Swift 3 （Xcode 8，僅適用於iOS 8.0及更高版本）

1）導入Photos框架

import Photos

2）在imagePickerController（_：didFinishPickingMediaWithInfo :)中獲取資產URL

3）使用fetchAssets獲取資產（withALAssetURLs：options :)

4）使用requestImageData獲取實際圖像數據（for：options：resultHandler :)。 在此方法的結果處理程序中，您將獲得數據以及文件的URL（可以在模擬器上訪問URL，但遺憾的是在設備上無法訪問 - 在我的測試中，startAccessingSecurityScopedResource（）始終返回false）。 但是，此URL仍可用於查找文件名。

示例代碼：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    dismiss(animated: true, completion: nil)
    if let assetURL = info[UIImagePickerControllerReferenceURL] as? URL,
        let asset = PHAsset.fetchAssets(withALAssetURLs: [assetURL], options: nil).firstObject,
        let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first,
        let targetURL = Foundation.URL(string: "file://\(documentsPath)") {

        PHImageManager.default().requestImageData(for: asset, options: nil, resultHandler: { (data, UTI, _, info) in
            if let imageURL = info?["PHImageFileURLKey"] as? URL,
                   imageData = data {
                    do {
                        try data.write(to: targetURL.appendingPathComponent(imageURL.lastPathComponent), options: .atomic)

                        self.proceedWithUploadFromPath(targetPath: targetURL.appendingPathComponent(imageURL.lastPathComponent))

                   } catch { print(error) }
                }
            }
        })
    }
}

這將為您提供AS IS文件，包括其正確的名稱，您甚至可以讓UTI確定正確的mimetype（除了通過文件擴展名確定），同時准備上傳多部分正文。

Answer 4

獲取圖像UIImagePickerControllerReferenceUR。 該示例代碼如下

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    NSURL *imageURL = [info valueForKey:UIImagePickerControllerReferenceURL];
    ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)
    {
        ALAssetRepresentation *representation = [myasset defaultRepresentation];
        NSString *fileName = [representation filename];
        NSLog(@"fileName : %@",fileName);

        CGImageRef ref = [representation fullResolutionImage];
        ALAssetOrientation orientation = [[myasset valueForProperty:@"ALAssetPropertyOrientation"] intValue];
        UIImage *image = [UIImage imageWithCGImage:ref scale:1.0 orientation:(UIImageOrientation)orientation];

    };

    ALAssetsLibrary* assetslibrary = [[[ALAssetsLibrary alloc] init] autorelease];
    [assetslibrary assetForURL:imageURL 
                   resultBlock:resultblock
                  failureBlock:nil];

}

注意：它僅適用於iOS 5及更高版本。

Answer 5

我找到的最簡單的方法是

第1步：獲取DocumentsDirectory的路徑

func fileInDocumentsDirectory(filename: String) -> String {
    let documentsFolderPath = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)[0] as NSString
    return documentsFolderPath.appendingPathComponent(filename)
}

第2步：使用tempFileName保存路徑

 func saveImage(image: UIImage, path: String ) {
    let pngImageData = UIImagePNGRepresentation(image)

    do {
        try pngImageData?.write(to: URL(fileURLWithPath: path), options: .atomic)
    } catch {
        print(error)
    }
}

第3步：在imagePickerController函數中使用

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]){

    if var image = info[UIImagePickerControllerOriginalImage] as? UIImage {// image asset

    self.saveImage(image: image, path: fileInDocumentsDirectory(filename: "temp_dummy_image.png"))

}

第4步：在需要時獲取圖像

得到像這樣的參考

let localfilepath = self.fileInDocumentsDirectory（filename：“temp_dummy_image.png”）

步驟5：使用圖像后，刪除臨時圖像

func removeTempDummyImagefileInDocumentsDirectory(filename: String) {

    let fileManager = FileManager.default
    let documentsUrl =  FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first! as NSURL
    let documentsPath = documentsUrl.path

    do {
        if let documentPath = documentsPath
        {
            let fileNames = try fileManager.contentsOfDirectory(atPath: "\(documentPath)")
            print("all files in cache: \(fileNames)")
            for fileName in fileNames {

                if (fileName.hasSuffix(".png"))
                {
                    let filePathName = "\(documentPath)/\(fileName)"
                    try fileManager.removeItem(atPath: filePathName)
                }
            }

            let files = try fileManager.contentsOfDirectory(atPath: "\(documentPath)")
            print("all files in cache after deleting images: \(files)")
        }

    } catch {
        print("Could not clear temp folder: \(error)")
    }

}

Answer 6

您可以通過創建表單上傳圖像嘗試下面的代碼

-(void)UploadImage{

NSString *urlString = @"yourUrl";
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"POST"];

NSMutableData *body = [NSMutableData data];


NSString *boundary = [NSString stringWithString:@"---------------------------14737809831466499882746641449"];
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request addValue:contentType forHTTPHeaderField:@"Content-Type"];

// file
NSData *imageData = UIImageJPEGRepresentation([self scaleAndRotateImage:[selectedImageObj]],90);


[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// [body appendData:[[NSString stringWithString:@"Content-Disposition: attachment; name=\"user_photo\"; filename=\"photoes.jpg\"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"image\"; filename=\"%@.jpg\"\r\n",@"ImageNmae"] dataUsingEncoding:NSUTF8StringEncoding]];

[body appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
[body appendData:[NSData dataWithData:imageData]];
[body appendData:[[NSString stringWithString:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];


// close form
[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// set request body
[request setHTTPBody:body];
//return and test
NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
NSString *returnString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];

  }