似乎无法修复此基本保存/获取请求
现在已经过了3个星期，我一直在寻求这个网站的帮助，使用Core Data进行这个简单的保存/获取功能，但我无法让它工作。我不断收到人们的不同建议并相应地更改我的代码，但永远无法使其正常工作。
它非常令人沮丧的是它花了这么长时间来解决这个简单的错误，但我在打击之前的一周内完成了100倍的工作。在学习如何编程时，它真的很无聊。
这是场景：
TableView默认为空，直到用户通过导航栏中的+按钮输入名称字符串。输入的字符串应该将一个单元格添加到视图中，并将名称作为标题。它应该保存到内存中，并在重新启动应用程序时获取。
问题：
我得到以下错误@ line：
cell.textLabel.text = [eventsArray objectAtIndex:indexPath.row];
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
2011-04-11 22:40:49.824 Curl[2244:207] -[Routine isEqualToString:]: unrecognized selector sent to instance 0x5c09ad0
2011-04-11 22:40:50.005 Curl[2244:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Routine isEqualToString:]: unrecognized selector sent to instance 0x5c09ad0'
`@implementation RoutineTableViewController
@synthesize tableView;
@synthesize eventsArray;
@synthesize entered;
@synthesize managedObjectContext;
#pragma mark - View lifecycle
- (void)viewDidLoad
{
if (managedObjectContext == nil)
{
managedObjectContext = [(CurlAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];
}
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Routine" inManagedObjectContext:managedObjectContext];
[request setEntity:entity];
NSError *error = nil;
NSMutableArray *mutableFetchResults = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
if (mutableFetchResults == nil) {
// Handle the error.
}
[self setEventsArray:mutableFetchResults];
[mutableFetchResults release];
[request release];
UIBarButtonItem * addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(showPrompt)];
[self.navigationItem setLeftBarButtonItem:addButton];
[addButton release];
UIBarButtonItem *editButton = [[UIBarButtonItem alloc]initWithTitle:@"Edit" style:UIBarButtonItemStyleBordered target:self action:@selector(toggleEdit)];
self.navigationItem.rightBarButtonItem = editButton;
[editButton release];
[super viewDidLoad];
}
- (void)viewDidUnload
{
self.eventsArray = nil;
[super viewDidUnload];
}
-(void)toggleEdit
{
[self.tableView setEditing: !self.tableView.editing animated:YES];
if (self.tableView.editing)
[self.navigationItem.rightBarButtonItem setTitle:@"Done"];
else
[self.navigationItem.rightBarButtonItem setTitle:@"Edit"];
}
- (void)dealloc
{
[managedObjectContext release];
[eventsArray release];
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#pragma mark -
#pragma mark Add an event
-(void)addEvent
{
Routine *routine = (Routine *)[NSEntityDescription insertNewObjectForEntityForName:@"Routine" inManagedObjectContext:managedObjectContext];
routine.name=entered;
NSError *error = nil;
if (![managedObjectContext save:&error]) {
// Handle the error.
}
NSLog(@"%@", error);
[eventsArray insertObject:routine atIndex:0];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
-(void)showPrompt
{
AlertPrompt *prompt = [AlertPrompt alloc];
prompt = [prompt initWithTitle:@"Add Workout Day" message:@"n n Please enter title for workout day" delegate:self cancelButtonTitle:@"Cancel" okButtonTitle:@"Add"];
[prompt show];
[prompt release];
}
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (buttonIndex != [alertView cancelButtonIndex])
{
entered = [(AlertPrompt *)alertView enteredText];
if(eventsArray && entered)
{
[eventsArray addObject:entered];
[tableView reloadData];
[self addEvent];
}
}
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [eventsArray count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
// Dequeue or create a new cell.
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
cell.textLabel.text = [eventsArray objectAtIndex:indexPath.row];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the managed object at the given index path.
NSManagedObject *eventToDelete = [eventsArray objectAtIndex:indexPath.row];
[managedObjectContext deleteObject:eventToDelete];
// Update the array and table view.
[eventsArray removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:YES];
// Commit the change.
NSError *error = nil;
if (![managedObjectContext save:&error]) {
// Handle the error.
}
}
}`
没有找到相关结果
已邀请:
1 个回复
诧不达
这是导致问题的原因，因为.......你正在将例程类对象作为文本分配给textLabel ......要么 ＆lt; **更新代码***>Routine *tempRoutine = (Routine *)[eventsArray objectAtIndex:indexPath.row]; cell.textLabel.text = tempRoutine.name;if(eventsArray && entered) { //******it will also insert object in coredata.... is it duplicating data? Routine *tempRoutine = (Routine *)[NSEntityDescription insertNewObjectForEntityForName:@"Routine" inManagedObjectContext:managedObjectContext]; tempRoutine.name = entered; [eventsArray addObject:tempRoutine]; [tempRoutine release]; [tableView reloadData]; [self addEvent]; }