iphone - 使用 NSDocumentDirectory 存储图像不起作用？

Question

我正在为 iPad 开发此应用程序。我的第一个屏幕将显示 2 个 UIImageView(ImageView、ImageView2)和 2 个 UIButton(确认、浏览)。

我将简要描述我的应用程序的用途。点击“浏览”按钮后，它将显示 iPad 照片库中的照片。选择照片后，照片库将关闭，“ImageView”将显示所选照片。当点击“确认”按钮时，它将使用 NSDocumentDirectory 将图像存储到我的应用程序的项目中。之后，它将检索保存的照片并将其显示在“ImageView2”上。

浏览按钮..

- (IBAction) browsePhoto:(id)sender
{
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.delegate = self;
imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
UIPopoverController *popover = [[UIPopoverController alloc] initWithContentViewController:imagePickerController];
[popover setPopoverContentSize:CGSizeMake(320,320)];
[popover presentPopoverFromRect:CGRectMake(200,200,-100,-100) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
self.popoverController = popover;
[imagePickerController  release];
}

在 ImageView 上显示选定的图像..

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)selectedImage editingInfo:(NSDictionary *)editingInfo 
{
[self.popoverController dismissPopoverAnimated:YES];
imageView.image = selectedImage;
}

确认按钮..

- (IBAction) confirmPhoto:(id)sender
{

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSString *savedImagePath = [documentsDir stringByAppendingPathComponent:@"SavedImage.png"];
UIImage *image = imageView.image;
NSData *imageData = UIImagePNGRepresentation(image);
[imageData writeToFile:savedImagePath atomically:NO];
imageView2.image = [UIImage imageNamed:@"SavedImage.png"];
}

我可以从照片库中查看照片，选择一张照片，并使“ImageView”显示所选照片。但是当我点击“确认”按钮时，“ImageView2”不显示照片。我不知道问题出在哪里。

照片保存了吗？或者我以前检索保存的照片的方式是错误的？

Answer 1

NSString *filePath=[NSString stringWithFormat:@"%@/%@",documentsDir,@"SavedImage.png"];
imageView2.image=[UIImage imageWithContentsOfFile:filePath];