存储对相机胶卷中保存的图像的引用

发布于 2024-10-24 08:09:21 字数 319 浏览 2 评论 0原文

我一直在开发一个简单的应用程序，它允许用户拍照并将其存储在相机胶卷中以供以后使用。为此，我使用 UIImagePickerController 和 UIImageWriteToSavedPhotosAlbum 方法，该方法运行良好。

我的问题是：有什么方法可以将图像的路径存储在相机胶卷中，以便我以后可以使用它再次调用图像？或者，我是否必须将图像保存在应用程序中才能稍后再次使用？

如果有一种简单的方法可以做到这一点，那就太好了，因为在视频中，您只需存储特定视频的 NSUrl，然后调用 MPMoviePlayerController 为您完成所有操作。

任何帮助将不胜感激！

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放血 2024-10-31 08:09:21

事实证明，做到这一点其实并不难。在 UIImagePickerDelegate 方法中：

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

NSDictionary“info”实际上包含存储在相机胶卷上的图像或电影的 url。您只需检查：

if([[info valueForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString *)kUTTypeMovie]){ // If the user took a video,
  movieURL = [[info valueForKey:UIImagePickerControllerMediaURL] retain];// Get the URL of where the movie is stored.
  UISaveVideoAtPathToSavedPhotosAlbum([movieURL path], nil, nil, nil);   // Save the movie to the photo album.
}

，这会将电影保存到相机胶卷，并记录 url。对照片进行类似操作，只需将“kUTTypeMovie”替换为“kUTTypeImage”，然后替换

movieURL = [[info valueForKey:UIImagePickerControllerMediaURL] retain];// Get the URL of where the movie is stored.
UISaveVideoAtPathToSavedPhotosAlbum([movieURL path], nil, nil, nil);   // Save the movie to the photo album.

为

UIImage * image = [info valueForKey:UIImagePickerControllerOriginalImage];    
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

如果您需要将 UIImage 存储在相机胶卷上，则 stackoverflow 上有一篇很棒的文章使用 NSCoding 保存 UIImage，您可以使用它在应用中存储图像。希望对某人有帮助！

It turns out that it is actually not that hard to do this. In the UIImagePickerDelegate method:

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

the NSDictionary "info" actually contains the url to the image or the movie which is stored on the Camera Roll. You need only check:

if([[info valueForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString *)kUTTypeMovie]){ // If the user took a video,
  movieURL = [[info valueForKey:UIImagePickerControllerMediaURL] retain];// Get the URL of where the movie is stored.
  UISaveVideoAtPathToSavedPhotosAlbum([movieURL path], nil, nil, nil);   // Save the movie to the photo album.
}

and this will save the movie to the Camera Roll, as well as record the url. Doing it for a photo is analogous, just replace the "kUTTypeMovie" with "kUTTypeImage", and replace

movieURL = [[info valueForKey:UIImagePickerControllerMediaURL] retain];// Get the URL of where the movie is stored.
UISaveVideoAtPathToSavedPhotosAlbum([movieURL path], nil, nil, nil);   // Save the movie to the photo album.

with

UIImage * image = [info valueForKey:UIImagePickerControllerOriginalImage];    
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);

If you need to store the UIImage not on the Camera Roll, there is a great post on stackoverflow Saving UIImage with NSCoding that you can use to store the image in your app. Hope that helps someone!

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