如何从照片库加载照片并将其存储到应用程序项目中？

Posted 2023-03-12

【中文标题】如何从照片库加载照片并将其存储到应用程序项目中？

【英文标题】：How to load photos from photo gallery and store it into application project?

【发布时间】：2011-09-30 04:06:12

【问题描述】：

我正在开发一个与我在此处找到的示例代码几乎相同的应用程序。但我想做的方法与示例代码不同。 链接：PhotoLocations

第一个屏幕将有一个 ImageView 和 2 个按钮（选择照片、确认）。 当点击“选择照片”按钮时，它将导航到另一个屏幕，该屏幕从我的 iPad 的照片库中检索照片。选择照片时，它将解除当前屏幕并返回显示ImageView上所选照片的​​第一个屏幕。

点击“确认”按钮时，照片将存储到我的应用程序的项目中（例如 /resources/images/photo.jpg）。

请问我该怎么做？

【问题讨论】：

在 iPhone 中，您必须使用 UIImagePickerController 从图库中检索图像，您可以通过将其保存在 NSDocumentsDirectory 中将它们放入您的应用程序中

是的，谢谢，但我希望有一些示例代码，以便我参考。

谷歌“UIImagePickerController 参考”。转到 Apple 的网站。

【参考方案1】：

这将带您进入图片库，您可以选择图片。

UIImagePickerController *imagePickerController = [[UIImagePickerController alloc]init];
imagePickerController.delegate = self;
imagePickerController.sourceType =  UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:imagePickerController animated:YES completion:nil];

这将帮助您选择图像

- (void)imagePickerController:(UIImagePickerController *)picker 
    didFinishPickingImage:(UIImage *)image
              editingInfo:(NSDictionary *)editingInfo

    // Dismiss the image selection, hide the picker and

    //show the image view with the picked image

    [picker dismissViewControllerAnimated:YES completion:nil];
    //UIImage *newImage = image;

然后你就可以把这张图片存入文档目录了……

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,     NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:@"savedImage.png"];
UIImage *image = imageView.image; // imageView is my image from camera
NSData *imageData = UIImagePNGRepresentation(image);
[imageData writeToFile:savedImagePath atomically:NO];

要自己点击图片，请使用此

- (IBAction) takePhoto:(id) sender

    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];

    imagePickerController.delegate = self;
    imagePickerController.sourceType =  UIImagePickerControllerSourceTypeCamera;

    [self presentModalViewController:imagePickerController animated:YES];

【讨论】：

我可以知道如何将图像从 ImageView 存储到文档目录吗？

我只是想到了一个额外的功能。在第一个屏幕中，我将“选择照片”按钮更改为“从照片库浏览”，并添加一个新按钮“拍摄新照片”。通过点击该按钮，我的应用程序将启动相机，一旦用户拍照，它将返回到第一个屏幕，在 ImageView 上显示图片，该图片也可以保存到我的文档目录中。

最后一部分 .. 上面写着“要自己点击图片，请使用这个”

存储部分不适合我。我尝试在旁边放置另一个名为“ImageView2”的图像视图。然后在我点击“确认”按钮后，我添加了额外的代码：ImageView2.image = [UIImage imageNamed:@"savedImage.png"];但它不显示图像！ :(

[UIImage imageNamed:@"savedImage.png"];这仅适用于存储在应用程序包中的图像。要从文档目录访问图像，您需要以下内容... NSArray *sysPaths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES ); NSString *docDirectory = [sysPaths objectAtIndex:0]; NSString *filePath = [NSString stringWithFormat:@"%@/Thumbnail-small.jpg", docDirectory]; background.image = [[[UIImage alloc] initWithContentsOfFile:filePath] autorelease];

【参考方案2】：

UIImagePickerController *cardPicker = [[UIImagePickerController alloc]init];
cardPicker.allowsEditing=YES;
cardPicker.delegate=self;
cardPicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
[self presentModalViewController:appDelegate.cardPicker animated:YES];
[cardPicker release];

这个委托方法会返回你从相册中选择的图片

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)img editingInfo:(NSDictionary *)editInfo 

    [[picker parentViewController] dismissModalViewControllerAnimated:YES];
    noImage.image=img;

【讨论】：

其中 noImage 是 UIImageView，我在其中显示从相册中挑选的图像...

我可以知道如何将 noImage 存储到文档目录吗？

【参考方案3】：

- (IBAction)UploadPhoto:(id)sender 
    
    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Please Select Your Option"delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Camera", @"Gallery",nil];
    
    [actionSheet showInView:self.view];
    
    UITableViewCell *clickedCell = (UITableViewCell *)[[sender superview] superview];
    
    NSIndexPath *clickedButtonPath = [jobstable indexPathForCell:clickedCell];
    
    isSectionIndex = clickedButtonPath.section;
    isRowIndex     = clickedButtonPath.row;
    



-(void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
    
    
    NSLog(@"From didDismissWithButtonIndex - Selected Option: %@", [actionSheet buttonTitleAtIndex:buttonIndex]);
    
    NSString*image=[actionSheet buttonTitleAtIndex:buttonIndex];
    
    if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:@"Camera"]) 
        
        if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
        
            UIAlertView* alert = [[UIAlertView alloc] initWithTitle:nil message:@"Device Camera Is Not Working" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
            [alert show];
            return;
        
        else
            
            UIImagePickerController *picker = [[UIImagePickerController alloc] init];
            picker.delegate = self;
            picker.allowsEditing = YES;
            picker.sourceType = UIImagePickerControllerSourceTypeCamera;
            
            [self presentViewController:picker animated:YES completion:NULL];
            
        
    
    
    else if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:@"Gallery"])
        
        
        UIImagePickerController *pickerView = [[UIImagePickerController alloc] init];
        pickerView.allowsEditing = YES;
        pickerView.delegate = self;
        [pickerView setSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
        [self presentViewController:pickerView animated:YES completion:nil];
        
    
    


- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
UIImage* orginalImage = [info objectForKey:UIImagePickerControllerOriginalImage];
        
        
        
        NSIndexPath *indexPath = [NSIndexPath indexPathForRow:isRowIndex inSection:isSectionIndex];
        
        UITableViewCell *cell = [jobstable cellForRowAtIndexPath:indexPath];
        
        UIImageView *tableIMAGE=(UIImageView *)[cell.contentView viewWithTag:19];
        
        tableIMAGE.image=orginalImage;
        
  answersARRAY[indexPath.row] = [NSString stringWithFormat:@"-1,%@,%@,",answersARRAY[indexPath.row],imageStris];

    
        
        [self dismissViewControllerAnimated:YES completion:nil];
        
        
    
    
    - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 
        
        [picker dismissViewControllerAnimated:YES completion:NULL];
    
    

【讨论】：

这是对已被接受的旧问题的新答案。如果接受的答案没有，您的答案是什么？此外，添加有关此代码如何工作的说明将对未来的访问者有所帮助。