一段时间后，我现在能够在对所选行进行长按操作后从表视图中删除核心数据记录。根据我的应用程序要求，我不想永久删除记录，我只想将记录标记为已删除，因此我创建了一个名为ToDoStatus的属性，我要更新并将其内容更改为“标记为已删除” '当用户对所选行执行长按操作时。 这里有你现在的代码（永久删除行）。 恳请您告诉我在handleLongPress方法中更改属性内容值的方法：
#import "RootViewController.h"
#import "AddToDoViewController.h"
#import "EditToDoViewController.h"
#import "MenuViewController.h"
@interface RootViewController ()
- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath;
@end
@implementation RootViewController
@synthesize fetchedResultsController, managedObjectContext,AddToDoButton,MenuToDoButton;
#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad {
[super viewDidLoad];
// [self setTitle:@"Today"];
[[self navigationItem] setRightBarButtonItem:[self editButtonItem]];
self.editButtonItem.tintColor = [UIColor redColor];
UILabel *lblTitle = [[UILabel alloc] init];
lblTitle.text = @"Today";
lblTitle.backgroundColor = [UIColor clearColor];
lblTitle.textColor = [UIColor blueColor];
lblTitle.shadowColor = [UIColor whiteColor];
lblTitle.shadowOffset = CGSizeMake(0, 1);
lblTitle.font = [UIFont fontWithName:@"Noteworthy" size:25.0];
[lblTitle sizeToFit];
self.navigationItem.titleView = lblTitle;
[self.editButtonItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
[UIFont fontWithName:@"Noteworthy" size:20], NSFontAttributeName,
[UIColor blueColor], NSForegroundColorAttributeName,
nil]
forState:UIControlStateNormal];
self.tableView.delegate = self;
self.tableView.dataSource = self;
NSError *error = nil;
if (![[self fetchedResultsController] performFetch:&error])
{
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
}
- (void) viewWillAppear:(BOOL)animated{
NSError *error = nil;
if (![[self fetchedResultsController] performFetch:&error])
{
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
[self.tableView reloadData];
}
- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath
{
NSManagedObject *managedObject = [fetchedResultsController objectAtIndexPath:indexPath];
[[cell textLabel] setText:[[managedObject valueForKey:@"estado"] description]];
NSString *myString = [NSString stringWithFormat:@"%@",[[managedObject valueForKey:@"todoYear"] description]];
UIButton *urgentButton = [[UIButton alloc]initWithFrame:CGRectMake(15, 25, 18, 18)];
[urgentButton setImage:[UIImage imageNamed:@"urgent"]forState:UIControlStateNormal];
[cell addSubview:urgentButton];
UIButton *yellowButton = [[UIButton alloc]initWithFrame:CGRectMake(305, 5, 10, 40)];
[yellowButton setImage:[UIImage imageNamed:@"Red"]forState:UIControlStateNormal];
[cell addSubview:yellowButton];
UIButton *doneButton = [[UIButton alloc]initWithFrame:CGRectMake(33, 27, 18, 18)];
[doneButton setImage:[UIImage imageNamed:@"alldone"]forState:UIControlStateNormal];
[cell addSubview:doneButton];
UIButton *doneButton2 = [[UIButton alloc]initWithFrame:CGRectMake(53, 27, 18, 18)];
[doneButton2 setImage:[UIImage imageNamed:@"alldone"]forState:UIControlStateNormal];
[cell addSubview:doneButton2];
UIButton *doneButton3 = [[UIButton alloc]initWithFrame:CGRectMake(71, 27, 18, 18)];
[doneButton3 setImage:[UIImage imageNamed:@"urgent"]forState:UIControlStateNormal];
[cell addSubview:doneButton3];
[[cell detailTextLabel] setText:@" "];
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
cell.textLabel.textColor = [UIColor blueColor];
cell.textLabel.font = [UIFont fontWithName:@"Noteworthy" size:22.0f];
cell.detailTextLabel.font = [UIFont fontWithName:@"Noteworthy" size:15.0f];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
EditToDoViewController *detailViewController = [[EditToDoViewController alloc] initWithNibName:@"EditToDoViewController" bundle:nil];
NSManagedObject *selectedObject = [[self fetchedResultsController] objectAtIndexPath:indexPath];
detailViewController.selectedObject = selectedObject;
//[self.navigationController pushViewController:detailViewController animated:YES];
[self presentViewController:detailViewController animated:YES completion:nil];
}
#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [[fetchedResultsController sections] count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
id <NSFetchedResultsSectionInfo> sectionInfo = [[fetchedResultsController sections] objectAtIndex:section];
return [sectionInfo numberOfObjects];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
reuseIdentifier:@"Cell"] autorelease];
}
//long press
UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]
initWithTarget:self action:@selector(handleLongPress:)];
lpgr.minimumPressDuration = 1.00;
//seconds
[cell addGestureRecognizer:lpgr];
[self configureCell:cell atIndexPath:indexPath];
return cell;
}
-(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
{
CGPoint p = [gestureRecognizer locationInView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:p];
if (indexPath == nil)
NSLog(@"long press on table view but not on a row");
else
{
if (gestureRecognizer.state == UIGestureRecognizerStateEnded) {
NSLog(@"UIGestureRecognizerStateEnded");
//Do Whatever You want on End of Gesture
}
else if (gestureRecognizer.state == UIGestureRecognizerStateBegan){
UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Announcement" message: @"You have long-pressed the row...!" delegate: nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
NSLog(@"UIGestureRecognizerStateBegan.");
NSManagedObjectContext *context = [fetchedResultsController managedObjectContext];
[context deleteObject:[fetchedResultsController objectAtIndexPath:indexPath]];
NSLog(@"long press on table view at row %d", indexPath.row);
// Update ToDoStatus
NSError *error1 = nil;
if (![[self fetchedResultsController] performFetch:&error1])
{
NSLog(@"Unresolved error %@, %@", error1, [error1 userInfo]);
abort();
}
NSError *error = nil;
if (![context save:&error])
{
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
[self.tableView reloadData];
//Do Whatever You want on Began of Gesture
}
}
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete)
{
NSManagedObjectContext *context = [fetchedResultsController managedObjectContext];
[context deleteObject:[fetchedResultsController objectAtIndexPath:indexPath]];
NSError *error = nil;
if (![context save:&error])
{
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
NSError *error1 = nil;
if (![[self fetchedResultsController] performFetch:&error1])
{
NSLog(@"Unresolved error %@, %@", error1, [error userInfo]);
abort();
}
UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"To-Do Deleted" message: @"You have marked To-Do as deleted...!" delegate: nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
[self.tableView reloadData];
}
}
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
- (void)tableView:(UITableView *)tableView
moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath
toIndexPath:(NSIndexPath *)destinationIndexPath;
{
NSMutableArray *things = [[fetchedResultsController fetchedObjects] mutableCopy];
// Grab the item we're moving.
NSManagedObject *thing = [[self fetchedResultsController] objectAtIndexPath:sourceIndexPath];
// Remove the object we're moving from the array.
[things removeObject:thing];
// Now re-insert it at the destination.
[things insertObject:thing atIndex:[destinationIndexPath row]];
// All of the objects are now in their correct order. Update each
// object's displayOrder field by iterating through the array.
int i = 0;
for (NSManagedObject *mo in things)
{
[mo setValue:[NSNumber numberWithInt:i++] forKey:@"displayOrder"];
}
[things release], things = nil;
[managedObjectContext save:nil];
}
#pragma mark -
#pragma mark Fetched results controller
- (IBAction)AddToDoAction:(id)sender {
AddToDoViewController *viewController = [[AddToDoViewController alloc] init];
[self presentViewController:viewController animated:YES completion:nil];
}
#pragma mark Fetched results controller
- (IBAction)MenuToDoAction:(id)sender {
MenuViewController *viewController = [[MenuViewController alloc] init];
[self presentViewController:viewController animated:YES completion:nil];
}
- (NSFetchedResultsController *)fetchedResultsController
{
if (fetchedResultsController) return fetchedResultsController;
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity =
[NSEntityDescription entityForName:@"FavoriteThing"
inManagedObjectContext:managedObjectContext];
[fetchRequest setEntity:entity];
NSSortDescriptor *sortDescriptor =
[[NSSortDescriptor alloc] initWithKey:@"displayOrder"
ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc]
initWithObjects:sortDescriptor, nil];
NSNumber *yearBuscado = @2013;
NSNumber *mesBuscado = @12;
NSNumber *diaBuscado = @13;
NSString *tipourgente = @"Urgent";
NSString *tipocolor = @"Yellow";
NSPredicate *yearPredicate = [NSPredicate predicateWithFormat:@"todoYear == %@", yearBuscado];
NSPredicate *monthPredicate = [NSPredicate predicateWithFormat:@"todoMonth == %@", mesBuscado];
NSPredicate *dayPredicate = [NSPredicate predicateWithFormat:@"todoDay == %@", diaBuscado];
NSPredicate *urgentPredicate = [NSPredicate predicateWithFormat:@"urgent == %@", tipourgente];
NSPredicate *colorPredicate = [NSPredicate predicateWithFormat:@"color == %@", tipocolor];
[fetchRequest setSortDescriptors:sortDescriptors];
NSPredicate *busqueda = [NSCompoundPredicate andPredicateWithSubpredicates:@[yearPredicate, monthPredicate,dayPredicate,urgentPredicate]];
[fetchRequest setPredicate:busqueda];
NSFetchedResultsController *aFetchedResultsController =
[[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest
managedObjectContext:managedObjectContext
sectionNameKeyPath:nil cacheName:nil];
aFetchedResultsController.delegate = self;
[self setFetchedResultsController:aFetchedResultsController];
[aFetchedResultsController release];
[fetchRequest release];
[sortDescriptor release];
[sortDescriptors release];
return fetchedResultsController;
}
- (void)dealloc {
[fetchedResultsController release];
[managedObjectContext release];
[super dealloc];
}
@end
答案 0 :(得分：1)
您当前拥有deleteObject:的位置，请替换为：
[[fetchedResultsController objectAtIndexPath:indexPath] setValue:@"Gone" forKey:@"ToDoStatus"]
就是这样。