Question

我正在从iphone应用程序中的照片库中选择一张图片。我将如何检索实际的图像名称。

in .h class

UIImageView * imageView;

UIButton * choosePhotoBtn;

<。>在.m类

-(IBAction) getPhoto:(id) sender 
{
    UIImagePickerController * picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    if((UIButton *) sender == choosePhotoBtn)
    {
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }
    else 
    { 
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    }
    [self presentModalViewController:picker animated:YES];
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{
    [picker dismissModalViewControllerAnimated:YES];
    imageView.image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
}

我如何获得图像的实际名称？

我是iphone的新手。请帮帮我。

提前致谢。

Answer 1

导入文件中的AssetsLibrary：

#import <AssetsLibrary/AssetsLibrary.h>

而且，在- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

中

把

// get the ref url
NSURL *refURL = [info valueForKey:UIImagePickerControllerReferenceURL];

// define the block to call when we get the asset based on the url (below)
ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *imageAsset)
{
    ALAssetRepresentation *imageRep = [imageAsset defaultRepresentation];
    NSLog(@"[imageRep filename] : %@", [imageRep filename]);
};

// get the asset library and fetch the asset based on the ref url (pass in block above)
ALAssetsLibrary* assetslibrary = [[ALAssetsLibrary alloc] init];
[assetslibrary assetForURL:refURL resultBlock:resultblock failureBlock:nil];

因此您将在日志中获取图像名称。

*不要忘记添加现有框架：AssetsLibrary.framework 步骤进行：

在项目导航器中，选择您的项目
选择目标
选择“构建阶段”标签
使用库扩展程序打开'链接二进制文件
点击“+”按钮
选择您的框架
（可选）将添加的框架拖放到“框架”组

来源： http://www.raywenderlich.com/forums/viewtopic.php?f=2&p=34901 ＆安培; How to "add existing frameworks" in Xcode 4?

Answer 2

如果您正在构建适用于iOS 9+的目标，您将看到一堆ALAssetsLibrary的弃用警告，即：

＆＃39; assetForURL（_：resultBlock：failureBlock：）＆＃39;在iOS 9.0中已弃用：使用fetchAssetsWithLocalIdentifiers：options：在PHAsset上通过本地标识符获取资产（或者通过以前已知的ALAssetPropertyAssetURL查找PHAssets，使用来自Photos框架的fetchAssetsWithALAssetURLs：options :)

如警告所述，您应该使用PHAsset。例如，使用swift 2.x，您需要先将import Photos添加到文件中。然后，在didFinishPickingMediaWithInfo UIImagePickerControllerDelegate方法中使用fetchAssetsWithALAssetURLs来获取文件名：

if let imageURL = info[UIImagePickerControllerReferenceURL] as? NSURL {
    let result = PHAsset.fetchAssetsWithALAssetURLs([imageURL], options: nil)
    let filename = result.firstObject?.filename ?? ""
}

这会将filename设置为＆＃34; IMG_0007.JPG＆＃34;。

Answer 3

简单的Swift实现：

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

    if let referenceUrl = info[UIImagePickerControllerReferenceURL] as? NSURL {

        ALAssetsLibrary().assetForURL(referenceUrl, resultBlock: { asset in

            let fileName = asset.defaultRepresentation().filename()
            //do whatever with your file name

            }, failureBlock: nil)
        }
    }
}

请记住：import AssetsLibrary

Answer 4

在Objective C中，使用Photos框架并导入Photos / Photos.h

然后，在你的imagePickerController函数中添加以下内容以获取照片库中图像的文件名

NSURL *refURL = [info valueForKey:UIImagePickerControllerReferenceURL];
PHFetchResult *result = [PHAsset fetchAssetsWithALAssetURLs:@[refURL] options:nil];
NSString *filename = [[result firstObject] filename];

Answer 5

虽然您可以检索最后一个路径组件并将其用作文件名，但建议不要这样做。这些文件名由系统分配，供iTunes在同步时理解，不适合程序员访问，因为在将来的同步中它们可能被其他一些图像替换。

关于此问题的一个好方法是将当前日期指定为文件名，同时保存为从图库中挑选的图像。您可以将其保存在文档或库目录中，并使用映射PList文件将图像映射到其文件名。

或者，您也可以将唯一编号指定为文件名，并使用这些值访问图像。

Answer 6

从 Swift 3和iOS8 + 开始，.filename不再可访问。它仍可通过self.valueForKey（“filename”）获得，但不太合法。

但是，我在问题this answer中发现"iOS8 Photos Framework: How to get the name(or filename) of a PHAsset?"简短，合法。

Answer 7

适用于 iOS 10 的

Objective C 实施。似乎不推荐使用ALAssetsLibrary，因此您应该使用PHAsset：

-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{

    NSURL *imageURL = [info valueForKey:UIImagePickerControllerReferenceURL];
    PHAsset *phAsset = [[PHAsset fetchAssetsWithALAssetURLs:@[imageURL] options:nil] lastObject];
    NSString *imageName = [phAsset valueForKey:@"filename"];

    UIImage *photo = [info valueForKey:UIImagePickerControllerOriginalImage];

    NSLog(@"Picked image: %@ width: %f x height: %f",imageName, photo.size.width, photo.size.height);

    [picker dismissViewControllerAnimated:YES completion:nil];
}

Answer 8

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
{
    let imageUrl          = info[UIImagePickerControllerReferenceURL] as! NSURL
    let imageName         = imageUrl.lastPathComponent
    let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first!
    let photoURL          = NSURL(fileURLWithPath: documentDirectory)
    let localPath         = photoURL.appendingPathComponent(imageName!)
    let image             = info[UIImagePickerControllerOriginalImage]as! UIImage
    let data              = UIImagePNGRepresentation(image)

    do
    {
        try data?.write(to: localPath!, options: Data.WritingOptions.atomic)
    }
    catch
    {
        // Catch exception here and act accordingly
    }

    self.dismiss(animated: true, completion: nil);
}

Answer 9

 var fileName: String = "Attachment"

 if let imageURL = info[UIImagePickerControllerReferenceURL] as? URL {

    let assets = PHAsset.fetchAssets(withALAssetURLs: [imageURL], options: nil)
    let assetResource = PHAssetResource.assetResources(for: assets.firstObject!)
    fileName = assetResource.first?.originalFilename ?? "Attachment"
 }
 print(fileName)

如何在iphone中获取通过照片库选取的图像名称？

9 个答案: