我怎樣才能得到通過iPhone中的照片庫採摘的圖像的名稱？

Question

我在iPhone應用程序中從照片庫中選擇圖像。我將如何檢索實際的圖像名稱。

在.H類

UIImageView * imageView; 

UIButton * choosePhotoBtn; 

中的m級

-(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"]; 
} 

我如何獲得圖像的實際名稱？

我新的iphone。請幫幫我。

在此先感謝。

Answer 1

進口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]; 

所以你會得到在日誌中的映像名稱。

*不要忘記添加現有的框架：AssetsLibrary。框架 步驟：

1. 在項目導航，選擇項目
2. 選擇目標
3. 選擇「構建階段」選項卡
4. 打開「鏈接二進制與圖書館」擴展
5. 點擊'+'按鈕
6. 選擇您的框架
7. （可選）將添加的框架拖放到「框架」組中

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

Answer 2

雖然您可能能夠檢索最後一個路徑組件並將其用作文件名，但建議您不要這樣做。這些文件名由系統分配給iTunes，以便在同步時理解，並且不適合程序員訪問，因爲他們可能會在未來的同步中被其他圖像替換。

對此的一個好處是將當前日期指定爲文件名，同時保存到從庫中選取的圖像。您可以將其保存在文檔或庫目錄中，並使用映射PList文件將圖像映射到其文件名。

或者，您也可以指定唯一的數字作爲文件名並使用這些值訪問圖像。在文件

Answer 3

簡單迅速實施：

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) 
     } 
    } 
} 

記住：import AssetsLibrary

Answer 4

如果您正在爲iOS的9+目標，你會看到使用ALAssetsLibrary的一堆棄用警告，即：

'assetForURL（_：resultBlock：failureBlock :)' 被棄用的iOS 9.0：使用fetchAssetsWithLocalIdentifiers：選擇：對PHAsset本地標識符（獲取資產或由先前已知的ALAssetPropertyAssetURL使用fetchAssetsWithALAssetURLs查找PHAssets ：options :)而不是

正如警告所述，您應該使用PHAsset。例如，使用swift 2.x，您需要先將import Photos添加到您的文件中。然後，在didFinishPickingMediaWithInfo UIImagePickerControllerDelegate方法使用fetchAssetsWithALAssetURLs來獲取文件名：

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

這將設置filename是類似「IMG_0007.JPG」。

Answer 5

在Objective C，使用照片框架，並導入照片/ Photos.h

然後，在你imagePickerController功能 添加以下內容從照片庫中獲取圖像的文件名

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

Answer 6

從Swift 3和iOS8 + .filename不能再被訪問。它仍然可以通過self.valueForKey（「文件名」），但不完全合法。

但是，我發現問題"iOS8 Photos Framework: How to get the name(or filename) of a PHAsset?"中的this answer是簡短的，合法的。

Answer 7

Objective C實施方案iOS 10。ALAssetsLibrary似乎被棄用，所以你應該使用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); 
}