Question

我是Objective-c的新手。我需要在第一个函数中选择的图像在第二个函数中上传：

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

    UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
    self.imageView.image = chosenImage;

    [picker dismissViewControllerAnimated:YES completion:NULL];

}

- (IBAction)uploadPic:(UIButton *)sender {
    // COnvert Image to NSData
    NSData *dataImage = UIImageJPEGRepresentation([UIImage imageNamed:@"yourImage"], 1.0f);

//added after editing

    // set your URL Where to Upload Image
    NSString *urlString = @"http://url";

    // set your Image Name
    NSString *filename = @"uploaded_file";

    // Create 'POST' MutableRequest with Data and Other Image Attachment.
    NSMutableURLRequest* request= [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:urlString]];
    [request setHTTPMethod:@"POST"];
    NSString *boundary = @"---------------------------14737809831466499882746641449";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];
    NSMutableData *postbody = [NSMutableData data];
    [postbody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"%@.jpg\"\r\n", filename] dataUsingEncoding:NSUTF8StringEncoding]];
    [postbody appendData:[[NSString stringWithString:@"Content-Type: application/octet-stream\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [postbody appendData:[NSData dataWithData:dataImage]];
    [postbody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [request setHTTPBody:postbody];

    // Get Response of Your Request
    NSData *returnData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    NSString *responseString = [[NSString alloc] initWithData:returnData encoding:NSUTF8StringEncoding];
    NSLog(@"Response  %@",responseString);
//end editing
    }

在编辑注释之间添加的代码是我用来上传图片的代码

Answer 1

您既不应使用UIImageJPEGRepresentation也不应使用UIImagePNGRepresentation。这些将丢失图像的元数据，使文件变大（或者如果选择JPEG压缩因子使NSData变小，则会降低图像质量等）。

我建议您保存UIImagePickerControllerReferenceURL，然后，当用户选择保存图片时，您将返回到照片框架并检索基础的NSData图像。

因此，请务必导入Photos框架：

@import Photos;

另外，定义一个属性来捕获URL：

@property (nonatomic, strong) NSURL *imageReferenceURL;

然后在获得图像时捕获此URL：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    UIImage *chosenImage = info[UIImagePickerControllerEditedImage];
    self.imageView.image = chosenImage;
    self.imageReferenceURL = info[UIImagePickerControllerReferenceURL];

    [picker dismissViewControllerAnimated:YES completion:nil];
}

当您上传图片时，请从照片框架中检索原始资源NSData：

- (IBAction)uploadPic:(UIButton *)sender {
    PHFetchResult *result = [PHAsset fetchAssetsWithALAssetURLs:@[self.imageReferenceURL] options:nil];
    PHAsset *asset = [result firstObject];
    if (asset) {
        PHImageManager *manager = [PHImageManager defaultManager];
        [manager requestImageDataForAsset:asset options:nil resultHandler:^(NSData *imageData, NSString *dataUTI, UIImageOrientation orientation, NSDictionary *info) {
            // insert your code for uploading here, referencing the `imageData` here rather than `dataImage`.

            // Or, I might recommend AFNetworking:
            //
            // For example, if your web service was expecting a `multipart/form-data` POST and was
            // going to return a JSON response, you could do something like:

            NSString *urlString = @"http://192.168.0.10/udazz/2.0/2.2/ios/1.0/actions.php?targ=user&subTarg=post&txtComment=123456&txtType=ff";
            NSDictionary *parameters = @{@"targ"       : @"user",
                                         @"subTarg"    : @"post",
                                         @"txtComment" : @"123456",
                                         @"txtType"    : @"ff"};

            NSURL *fileURL     = info[@"PHImageFileURLKey"];
            NSString *filename = [fileURL lastPathComponent];
            NSString *mimeType = [self mimeTypeForPath:filename];

            AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
            // manager.responseSerializer = [AFHTTPResponseSerializer serializer]; // if response is string rather than JSON, uncomment this line 
            [manager POST:urlString parameters:parameters constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
                [formData appendPartWithFileData:imageData name:@"userfile" fileName:filename mimeType:mimeType];
            } success:^(NSURLSessionDataTask *task, id responseObject) {
                NSLog(@"responseObject = %@", responseObject);
            } failure:^(NSURLSessionDataTask *task, NSError *error) {
                NSLog(@"error = %@", error);
            }];
        }];
    }
}

或者，如果您想使用自己的上传代码，只需将其调整为使用NSURLSession（因为NSURLConnection现已弃用，您绝不应该执行同步网络请求）：

- (IBAction)uploadPic:(UIButton *)sender {
    PHFetchResult *result = [PHAsset fetchAssetsWithALAssetURLs:@[self.imageReferenceURL] options:nil];
    PHAsset *asset = [result firstObject];
    if (asset) {
        PHImageManager *manager = [PHImageManager defaultManager];
        [manager requestImageDataForAsset:asset options:nil resultHandler:^(NSData *imageData, NSString *dataUTI, UIImageOrientation orientation, NSDictionary *info) {
            // upload the `imageData`

            NSURL *fileURL = info[@"PHImageFileURLKey"];
            NSString *filename = [fileURL lastPathComponent];
            NSString *mimeType = [self mimeTypeForPath:filename];

            NSString *urlString = @"http://192.168.0.10/udazz/2.0/2.2/ios/1.0/actions.php?targ=user&subTarg=post&txtComment=123456&txtType=ff";

            NSMutableURLRequest* request= [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]];
            [request setHTTPMethod:@"POST"];
            NSString *boundary = @"---------------------------14737809831466499882746641449";
            NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
            [request addValue:contentType forHTTPHeaderField: @"Content-Type"];
            NSMutableData *postbody = [NSMutableData data];
            [postbody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];
            [postbody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"userfile\"; filename=\"%@\"\r\n", filename] dataUsingEncoding:NSUTF8StringEncoding]];
            [postbody appendData:[[NSString stringWithFormat:@"Content-Type: %@\r\n\r\n", mimeType] dataUsingEncoding:NSUTF8StringEncoding]];
            [postbody appendData:imageData];
            [postbody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",boundary] dataUsingEncoding:NSUTF8StringEncoding]];

            NSURLSessionTask *task = [[NSURLSession sharedSession] uploadTaskWithRequest:request fromData:postbody completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
                NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                NSLog(@"Response  %@",responseString);
            }];
            [task resume];
        }];
    }
}

顺便说一句，我以编程方式确定mime类型的例程（因为你真的不能假设图像是JPEG;它也可以是PNG，以及其他类型）如下： / p>

- (NSString *)mimeTypeForPath:(NSString *)path {
    // get a mime type for an extension using MobileCoreServices.framework

    CFStringRef extension = (__bridge CFStringRef)[path pathExtension];
    CFStringRef UTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, extension, NULL);
    assert(UTI != NULL);

    NSString *mimetype = CFBridgingRelease(UTTypeCopyPreferredTagWithClass(UTI, kUTTagClassMIMEType));
    assert(mimetype != NULL);

    CFRelease(UTI);

    return mimetype;
}

如果您需要支持早于Photos框架的iOS版本，请使用ALAssetsLibrary获取NSData。如果您需要如何操作的示例（仅当您需要在8.0之前支持iOS版本时），请告诉我。

Answer 2

您正在将拾取的图像指定给imageView。因此，您可以使用unionAll()的{{1}}属性访问它。

您可以访问：

image

Answer 3

我在我的演示项目中完成了您的要求。我使用UIIMagePicker委托函数

选择了图像

＆＃13;

@interface ViewController ()
{
    UIImage *chooseImage;
}


- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSDate *time = [NSDate date];
    NSDateFormatter* df = [NSDateFormatter new];
    [df setDateFormat:@"ddMMyyyy-hhmmss"];
    NSString *timeString = [df stringFromDate:time];
   NSString *fileName = [NSString stringWithFormat:@"%@", timeString];
    
    chooseImage = info[UIImagePickerControllerEditedImage];
    

    
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    documentsDirectoryPath = [paths objectAtIndex:0];
    
    NSLog(@"View Controller Path:%@",documentsDirectoryPath);
    
    
    savedImagePath = [documentsDirectoryPath
                      stringByAppendingPathComponent:[NSString stringWithFormat: @"%@-%d.png", fileName, num]];
    
    num += 1;
    
    NSData *imageData = UIImagePNGRepresentation(chooseImage);
    [imageData writeToFile:savedImagePath atomically:NO];
    
    
    [picker dismissViewControllerAnimated:YES completion:NULL];
    [self displayImage];
    
   }

-(void)displayImage
{
    self.imageView.image = chooseImage;
}

＆＃13;

从该方法我调用了另一个函数 - ＆gt; displayImage，我用它在UIImageView中显示图像。以下是代码。

在objective-c

3 个答案: