我怎样才能得到通过iPhone中的照片库采摘的图像的名称？

Question

我在iPhone应用程序中从照片库中选择图像。我将如何检索实际的图像名称。

在.H类

UIImageView * imageView; 

UIButton * choosePhotoBtn; 

中的m级

-(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？

我新的iphone。请帮帮我。

在此先感谢。

Answer 1

进口AssetsLibrary：

#import <AssetsLibrary/AssetsLibrary.h> 

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

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]; 

所以你会得到在日志中的映像名称。

*不要忘记添加现有的框架：AssetsLibrary。框架 步骤：

1. 在项目导航，选择项目
2. 选择目标
3. 选择“构建阶段”选项卡
4. 打开“链接二进制与图书馆”扩展
5. 点击'+'按钮
6. 选择您的框架
7. （可选）将添加的框架拖放到“框架”组中

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

Answer 2

虽然您可能能够检索最后一个路径组件并将其用作文件名，但建议您不要这样做。这些文件名由系统分配给iTunes，以便在同步时理解，并且不适合程序员访问，因为他们可能会在未来的同步中被其他图像替换。

对此的一个好处是将当前日期指定为文件名，同时保存到从库中选取的图像。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，您也可以指定唯一的数字作为文件名并使用这些值访问图像。在文件

Answer 3

简单迅速实施：

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) 
     } 
    } 
} 

记住：import AssetsLibrary

Answer 4

如果您正在为iOS的9+目标，你会看到使用ALAssetsLibrary的一堆弃用警告，即：

'assetForURL（_：resultBlock：failureBlock :)' 被弃用的iOS 9.0：使用fetchAssetsWithLocalIdentifiers：选择：对PHAsset本地标识符（获取资产或由先前已知的ALAssetPropertyAssetURL使用fetchAssetsWithALAssetURLs查找PHAssets ：options :)而不是

正如警告所述，您应该使用PHAsset。例如，使用swift 2.x，您需要先将import Photos添加到您的文件中。然后，在didFinishPickingMediaWithInfo UIImagePickerControllerDelegate方法使用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 ?? "" 
} 

这将设置filename是类似“IMG_0007.JPG”。

Answer 5

在Objective C，使用照片框架，并导入照片/ Photos.h

然后，在你imagePickerController功能 添加以下内容从照片库中获取图像的文件名

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

Answer 6

从Swift 3和iOS8 + .filename不能再被访问。它仍然可以通过self.valueForKey（“文件名”），但不完全合法。

但是，我发现问题"iOS8 Photos Framework: How to get the name(or filename) of a PHAsset?"中的this answer是简短的，合法的。

Answer 7

Objective C实施方案iOS 10。ALAssetsLibrary似乎被弃用，所以你应该使用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); 
}