我在互联网上到处都看过，但还没有找到一个解决方案。在我的应用程序中，我有一个表格视图，用户在其中添加了自己的单元格。在详细视图中，有一个UIImageView和一个可以拍照的地方。我需要能够将该图像保存在应用程序中的某个位置，然后在他们将其保存之后，他们可以稍后单击该单元格，它将显示他们花了一段时间的图像。
这是表格视图单元格和表格视图的代码:
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row == 0) // Don't move the first row
return NO;
return YES;
}
-(void)tableView:(UITableView *)tableView setEditing:(BOOL)editing animated:(BOOL) animated {
[super setEditing:editing animated:animated];
[tableView setEditing:editing animated:animated];
NSLog(@"EDIT BUTTON WILL BEGIN EDITING");
if (editing) {
[self.tableView setEditing:YES animated:YES];
} else {
[self.tableView setEditing:NO animated:YES];
}
[tableView reloadData];
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
NSManagedObjectContext *context = [self managedObjectContext];
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete object from database
[context deleteObject:[self.devices objectAtIndex:indexPath.row]];
NSError *error = nil;
if (![context save:&error]) {
NSLog(@"Can't Delete! %@ %@", error, [error localizedDescription]);
return;
}
// Remove device from table view
[WTStatusBar setStatusText:@"Removed" timeout:0.7 animated:YES];
[self.devices removeObjectAtIndex:indexPath.row];
[self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return _devices.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
[cell.textLabel setTextColor:[UIColor grayColor]];
[cell.textLabel setHighlightedTextColor:[UIColor whiteColor]];
[self.tableView setSeparatorStyle:UITableViewCellSeparatorStyleNone];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
NSManagedObject *device = [self.devices objectAtIndex:indexPath.row];
[cell.textLabel setText:[NSString stringWithFormat:@"%@", [device valueForKey:@"name"]]];
[cell.detailTextLabel setText:[device valueForKey:@"company"]];
[cell.textLabel setBackgroundColor:[UIColor clearColor]];
[cell.detailTextLabel setBackgroundColor:[UIColor clearColor]];
[cell setSelectionStyle:UITableViewCellSelectionStyleGray];
cell.backgroundView = [[UIImageView alloc] initWithImage:[[UIImage imageNamed:@"TableViewCell.png"] stretchableImageWithLeftCapWidth:0.0 topCapHeight:5.0]];
return cell;
}
- (NSManagedObjectContext *)managedObjectContext
{
NSManagedObjectContext *context = nil;
id delegate = [[UIApplication sharedApplication] delegate];
if ([delegate performSelector:@selector(managedObjectContext)]) {
context = [delegate managedObjectContext];
}
return context;
}
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath{
id ob = [_devices objectAtIndex:destinationIndexPath.row];
[_devices replaceObjectAtIndex:destinationIndexPath.row withObject:[_devices objectAtIndex:sourceIndexPath.row]];
[_devices replaceObjectAtIndex:sourceIndexPath.row withObject:ob];
}
这是将其保存到表格视图的代码:
- (IBAction)save:(id)sender {
NSManagedObjectContext *context = [self managedObjectContext];
UIImage *image = resultImage.image;
NSData *imageData = UIImagePNGRepresentation(image); //convert image into .png format.
NSFileManager *fileManager = [NSFileManager defaultManager];//create instance of NSFileManager
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //create an array and store result of our search for the documents directory in it
NSString *documentsDirectory = [paths objectAtIndex:0]; //create NSString object, that holds our exact path to the documents directory
NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"/%@KYRO Receipts Images/Barcode.png", resultImage]]; //add our image to the path
[fileManager createFileAtPath:fullPath contents:imageData attributes:nil]; //finally save the path (image)
NSLog(@"image saved");
if (self.device) {
// Update existing device
[self.device setValue:self.nameOfItem.text forKey:@"name"];
[self.device setValue:self.dateOfPurchase.text forKey:@"date"];
[self.device setValue:self.companyOfItem.text forKey:@"company"];
} else {
//
NSManagedObject *newDevice = [NSEntityDescription insertNewObjectForEntityForName:@"Receipt" inManagedObjectContext:context];
[newDevice setValue:self.nameOfItem.text forKey:@"name"];
[newDevice setValue:self.dateOfPurchase.text forKey:@"date"];
[newDevice setValue:self.companyOfItem.text forKey:@"company"];
}
NSError *error = nil;
// Save the object to persistent store
if (![context save:&error]) {
NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
}
[WTStatusBar setStatusText:@"Saving data..." animated:YES];
[self performSelector:@selector(setTextStatusProgress3) withObject:nil afterDelay:0.1];
[self.navigationController popViewControllerAnimated:YES];
[self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
}
最佳答案
只需将其保存在应用程序的文档目录中即可。并将路径存储在NSUserDefaults内部。然后，您可以随时随地访问它:
NSData *imageData = UIImagePNGRepresentation(newImage);//Where newImage is a UIImage
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *imagePath =[documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.png",@"cached"]];
if (![imageData writeToFile:imagePath atomically:NO])
{
//failed to save
}
else
{
//success
}
然后从存储它的任何位置检索它，并使用路径初始化图像:
UIImage *customImage = [UIImage imageWithContentsOfFile:theImagePath];
//这里可能重复:
Storing images locally on an iOS device
关于ios - 在“详细信息” View 中保存“用户拍摄”的照片，并在“表格 View ”中单击时将其加载，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/16328358/