当我点击我的uialertview上的添加按钮时，我的应用程序崩溃（冻结），它应该向表中添加一个单元格。该错误与我在此处发布的代码行有关：
以下是错误消息：
此行的SIGABRT：cell.textLabel.text = [self.eventsArray objectAtIndex:indexPath.row];
好吧我发现问题是因为eventArray持有一个对象而不是我需要的字符串。如何修改代码以使save / fetch正常工作？
应该发生的是当用户将一个字符串输入到警报视图并按下ok时，它应该保存到例程实体的name属性中，并且表视图应该相应地更新自己。
这是我的viewController代码：
#import "RoutineTableViewController.h"
#import "AlertPrompt.h"
#import "Routine.h"
#import "CurlAppDelegate.h"
@implementation RoutineTableViewController
@synthesize tableView;
@synthesize eventsArray;
@synthesize managedObjectContext;
- (void)dealloc
{
[managedObjectContext release];
[eventsArray release];
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
-(void)addEvent
{
CurlAppDelegate *curlAppDelegate = [[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [curlAppDelegate managedObjectContext];
Routine *routine = (Routine *)[NSEntityDescription insertNewObjectForEntityForName:@"Routine" inManagedObjectContext:context];
NSManagedObject *newRoutineEntry;
newRoutineEntry = [NSEntityDescription insertNewObjectForEntityForName:@"Routine" inManagedObjectContext:context];
NSError *error = nil;
if (![context 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];
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
CurlAppDelegate *curlAppDelegate = [[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [curlAppDelegate managedObjectContext];
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Routine" inManagedObjectContext:context];
[request setEntity:entity];
NSError *error = nil;
NSMutableArray *mutableFetchResults = [[context 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)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)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])
{
NSString *entered = [(AlertPrompt *)alertView enteredText];
if(eventsArray && entered)
{
[eventsArray addObject:entered];
[tableView reloadData];
[self addEvent];
}
}
}
- (void)viewDidUnload
{
self.eventsArray = nil;
[super viewDidUnload];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#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";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellEditingStyleDelete reuseIdentifier:CellIdentifier] autorelease];
cell.textLabel.text = [self.eventsArray objectAtIndex:indexPath.row];
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;
}
这是控制台输出：
2011-03-30 02:31:44.725 Curl[3303:707] -[Routine isEqualToString:]: unrecognized selector sent to instance 0x19d650
2011-03-30 02:31:44.824 Curl[3303:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Routine isEqualToString:]: unrecognized selector sent to instance 0x19d650'
*** Call stack at first throw:
(
0 CoreFoundation 0x3234564f __exceptionPreprocess + 114
1 libobjc.A.dylib 0x36588c5d objc_exception_throw + 24
2 CoreFoundation 0x323491bf -[NSObject(NSObject) doesNotRecognizeSelector:] + 102
3 CoreFoundation 0x32348649 ___forwarding___ + 508
4 CoreFoundation 0x322bf180 _CF_forwarding_prep_0 + 48
5 UIKit 0x354fcf65 -[UILabel setText:] + 32
6 Curl 0x0000682b -[RoutineTableViewController tableView:cellForRowAtIndexPath:] + 286
7 UIKit 0x355589ed -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] + 516
8 UIKit 0x3555876b -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:] + 34
9 UIKit 0x3562a053 -[_UITableViewUpdateSupport(Private) _setupAnimationsForNewlyInsertedCells] + 3722
10 UIKit 0x35627b99 -[_UITableViewUpdateSupport initWithTableView:updateItems:oldRowData:newRowData:oldRowRange:newRowRange:context:] + 320
11 UIKit 0x35626dc1 -[UITableView(_UITableViewPrivate) _updateWithItems:withOldRowData:oldRowRange:newRowRange:context:] + 972
12 UIKit 0x35626473 -[UITableView(_UITableViewPrivate) _endCellAnimationsWithContext:] + 4750
13 UIKit 0x3562501d -[UITableView _updateRowsAtIndexPaths:updateAction:withRowAnimation:] + 204
14 UIKit 0x356302b9 -[UITableView insertRowsAtIndexPaths:withRowAnimation:] + 20
15 Curl 0x00005dc3 -[RoutineTableViewController addEvent] + 398
16 Curl 0x000064b1 -[RoutineTableViewController alertView:willDismissWithButtonIndex:] + 228
17 UIKit 0x35621ee1 -[UIAlertView dismissWithClickedButtonIndex:animated:] + 192
18 UIKit 0x35621d25 -[UIAlertView(Private) _buttonClicked:] + 280
19 CoreFoundation 0x322b5571 -[NSObject(NSObject) performSelector:withObject:withObject:] + 24
20 UIKit 0x35513ec9 -[UIApplication sendAction:to:from:forEvent:] + 84
21 UIKit 0x35513e69 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 32
22 UIKit 0x35513e3b -[UIControl sendAction:to:forEvent:] + 38
23 UIKit 0x35513b8d -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 356
24 UIKit 0x35514423 -[UIControl touchesEnded:withEvent:] + 342
25 UIKit 0x35512bf5 -[UIWindow _sendTouchesForEvent:] + 368
26 UIKit 0x3551256f -[UIWindow sendEvent:] + 262
27 UIKit 0x354fb313 -[UIApplication sendEvent:] + 298
28 UIKit 0x354fac53 _UIApplicationHandleEvent + 5090
29 GraphicsServices 0x30557e77 PurpleEventCallback + 666
30 CoreFoundation 0x3231ca97 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 26
31 CoreFoundation 0x3231e83f __CFRunLoopDoSource1 + 166
32 CoreFoundation 0x3231f60d __CFRunLoopRun + 520
33 CoreFoundation 0x322afec3 CFRunLoopRunSpecific + 230
34 CoreFoundation 0x322afdcb CFRunLoopRunInMode + 58
35 GraphicsServices 0x3055741f GSEventRunModal + 114
36 GraphicsServices 0x305574cb GSEventRun + 62
37 UIKit 0x35525d69 -[UIApplication _run] + 404
38 UIKit 0x35523807 UIApplicationMain + 670
39 Curl 0x0000304f main + 82
40 Curl 0x00002ff8 start + 40
)
terminate called after throwing an instance of 'NSException'
(gdb)
答案 0 :(得分：0)
以上是代码中的问题
cell.textLabel.text = [self.eventsArray objectAtIndex:indexPath.row];
因为
[eventsArray insertObject:routine atIndex:0];
eventsArray保持Routine课程的对象不是NSString。
所以不要做
cell.textLabel.text = [self.eventsArray objectAtIndex:indexPath.row];
<强>编辑：
Routine* myRoutine = [self.eventsArray objectAtIndex:indexPath.row];
//you need to get your stored text value from Routine class
//let's say it myText
cell.textLabel.text = myText;
答案 1 :(得分：0)
我认为错误明确指出-[Routine isEqualToString:]：无法识别的选择器是问题所在。请检查一下。
答案 2 :(得分：0)
当应用程序崩溃时，使用debbuger查看[RoutineTableViewController tableView：cellForRowAtIndexPath：]方法。 如果你想这样做：
cell.textLabel.text = [self.eventsArray objectAtIndex：indexPath.row];
您必须确保将NSString对象放在eventsArray而不是Routine对象中。