我正在使用具有实体和几个属性的核心数据。属性之一称为ToDoStatus。实体记录的列表显示在表视图上，我要实现以下要求:
1.当用户长按单元格(约1秒)时，按下的记录必须将其ToDoStatus值更改为“Done”，然后重新加载不显示ToDoStatus =“Done”记录的表视图。
这是我当前的代码:
#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:@"thingName"] 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];
}
[self configureCell:cell atIndexPath:indexPath];
return cell;
}
- (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();
}
}
}
- (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
最佳答案
长按的方法如下:
- (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];
}
UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]
initWithTarget:self action:@selector(handleLongPress:)];
lpgr.minimumPressDuration = 1.0; //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.");
NSLog(@"long press on table view at row %d", indexPath.row);
// Update ToDoStatus
[self.tableView reloadData];
//Do Whatever You want on Began of Gesture
}
}
}
您的模型将跟踪模型中的ToDoStatus，然后决定如何在UI中显示它。