存储对相机胶卷中保存的图像的参考 [英] Storing a reference to an image saved in the Camera Roll

问题描述

我一直致力于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供以后使用。要做到这一点，我使用的是UIImagePickerController和方法UIImageWriteToSavedPhotosAlbum，它工作得很好。

I've been working on a simple application which allows the user to take a photo and store it in the camera roll for later use. To do this, I am using a UIImagePickerController, and the method UIImageWriteToSavedPhotosAlbum, which is working perfectly.

我的问题是：有没有办法存储图像的路径在相机胶卷中，以便我可以使用它稍后再次调用图像？或者，我是否必须将图像保存在应用程序中以便以后再次使用？

My question is: Is there any way to store the path to the image in the Camera Roll so that I can use that to call the image again later? Or, do I have to save the image in the app in order to use it again later?

如果有一种简单的方法可以做到这一点，那就好了，有一个视频，你只是存储特定视频的NSUrl，然后调用MPMoviePlayerController为你做所有事情。

It would be great if there was a simple way to do this, as there is with a video where you just store the NSUrl for the particular video, and then call MPMoviePlayerController to do everything for you.

任何帮助将不胜感激！

推荐答案

事实证明，实际上并不难做到这一点。在UIImagePickerDelegate方法中：

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

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

NSDictionaryinfo实际上包含图像的url或存储在相机上的电影滚。您只需要检查：

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.
}

这会将电影保存到相机胶卷，以及记录网址。为照片做它是类似的，只需用kUTTypeImage替换kUTTypeMovie，并替换

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);

如果您需要将UIImage存储在相机胶卷上，那么stackoverflow上有一篇很棒的帖子< a href =https://stackoverflow.com/questions/1072700/iphone-why-does-the-documentation-say-uiimageview-is-nscoding-compliant>使用NSCoding保存UIImage 可用于将图像存储在您的应用中。希望能帮助别人！

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!

这篇关于存储对相机胶卷中保存的图像的参考的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！