iPhone上图像的文件路径

Question

我有兴趣将文件（图像）从 iPhone 库/相机胶卷上传到远程 Web 服务器。我已经有一个脚本可以将任何文件从手机上传到网络服务器。但是，我假设要从 iPhone 上传图像，我需要该图像的路径。一旦用户从相机胶卷中选择所述图像，有什么方法可以做到这一点？即，如何获取相机胶卷中所选图像的文件路径？

我试过没有用。

谢谢！

Answer 1

您将需要查看ALAssetsLibrary 函数 - 这些函数可让您访问存储在 iOS 设备上的照片和视频库中的照片和视频。

具体来说，类似：

ALAssetsLibrary *assets = [[ALAssetsLibrary alloc] init];

[assets enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos
    usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
        [group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop) {
            //the ALAsset should be one of your photos - stick it in an array and after this runs, use it however you need
        }
    }
    failureBlock:^(NSError *error) {
        //something went wrong, you can't access the photo gallery
    }
];

编辑

如果您使用的是 UIImagePickerController 而不是纯粹的编程方法，这将大大简化它：

在：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *img = [info objectForKey:UIImagePickerControllerEditedImage];
    //you can use UIImagePickerControllerOriginalImage for the original image

    //Now, save the image to your apps temp folder, 

    NSString *path = [NSTemporaryDirectory() stringByAppendingPathComponent:@"upload-image.tmp"];
    NSData *imageData = UIImagePNGRepresentation(img);
    //you can also use UIImageJPEGRepresentation(img,1); for jpegs
    [imageData writeToFile:path atomically:YES];

    //now call your method
    [someClass uploadMyImageToTheWebFromPath:path];
}