我真的很喜欢iOS开发（以及一般的编程），如果你能解释我什么时候出现SIGABRT错误，我会很感激，我该怎么办才能解决？
我从一个表视图控制器到另一个视图控制器做了一个segue，当我点击一个单元格来预先形成segue时，我得到了这个：
这是整个控制台：
2014-04-05 00:12:21.832 Robonote[20893:70b] -[UITableViewCell content]: unrecognized selector sent to instance 0x8acb5a0
2014-04-05 00:12:21.874 Robonote[20893:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITableViewCell content]: unrecognized selector sent to instance 0x8acb5a0'
*** First throw call stack:
(
0 CoreFoundation 0x0173d5e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x014c08b6 objc_exception_throw + 44
2 CoreFoundation 0x017da903 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
3 CoreFoundation 0x0172d90b ___forwarding___ + 1019
4 CoreFoundation 0x0172d4ee _CF_forwarding_prep_0 + 14
5 Robonote 0x00003d3f -[NMNotesListViewController prepareForSegue:sender:] + 287
6 UIKit 0x0076306c -[UIStoryboardSegueTemplate _perform:] + 156
7 UIKit 0x007630f9 -[UIStoryboardSegueTemplate perform:] + 115
8 UIKit 0x00310775 -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1453
9 UIKit 0x00310924 -[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 279
10 UIKit 0x00314908 __38-[UITableView touchesEnded:withEvent:]_block_invoke + 43
11 UIKit 0x0024b183 ___afterCACommitHandler_block_invoke + 15
12 UIKit 0x0024b12e _applyBlockToCFArrayCopiedToStack + 403
13 UIKit 0x0024af5a _afterCACommitHandler + 532
14 CoreFoundation 0x017054ce __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
15 CoreFoundation 0x0170541f __CFRunLoopDoObservers + 399
16 CoreFoundation 0x016e3344 __CFRunLoopRun + 1076
17 CoreFoundation 0x016e2ac3 CFRunLoopRunSpecific + 467
18 CoreFoundation 0x016e28db CFRunLoopRunInMode + 123
19 GraphicsServices 0x036e29e2 GSEventRunModal + 192
20 GraphicsServices 0x036e2809 GSEventRun + 104
21 UIKit 0x0022ed3b UIApplicationMain + 1225
22 Robonote 0x0000357d main + 141
23 libdyld.dylib 0x01d7b701 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
这是NMNotesListViewController.m：
import "NMNotesListViewController.h"
#import "NMCreateNotesViewController.h"
@interface NMNotesListViewController ()
@property (strong, nonatomic) NSMutableArray *notes;
@end
@implementation NMNotesListViewController
- (IBAction) unwindToList: (UIStoryboardSegue *) segue
{
NMCreateNotesViewController *source = [segue sourceViewController];
NMNote *note = source.note;
if (note != nil) {
[self.notes addObject:note];
[self.tableView reloadData];
}
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.notes = [[NSMutableArray alloc] init];
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [self.notes count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"NotesPrototypeCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
// Configure the cell...
NMNote *note = [self.notes objectAtIndex:indexPath.row];
cell.textLabel.text = note.content;
return cell;
}
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(UITableViewCell *)sender
{
if ([[segue identifier] isEqualToString:@"noteSegue"]) {
NMCreateNotesViewController *destination = [segue destinationViewController];
NSInteger indx = [self.tableView indexPathForCell:sender].row;
NMNote *note = self.notes[indx];
destination.passedInString = note.content;
}
}
//#pragma mark - delegate
//
//- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
//{
//
//}
@end
这是NMCreateNotesViewController.m：
#import "NMCreateNotesViewController.h"
#import "NMNotesListViewController.h"
@interface NMCreateNotesViewController () <UITextViewDelegate>
@property (weak, nonatomic) IBOutlet UIBarButtonItem *saveButton;
@end
@implementation NMCreateNotesViewController
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
// listen for keyboard hide/show notifications so we can properly adjust the table's height
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
}
#pragma mark - Notifications
- (void)adjustViewForKeyboardReveal:(BOOL)showKeyboard notificationInfo:(NSDictionary *)notificationInfo
{
// the keyboard is showing so ƒ the table's height
CGRect keyboardRect = [[notificationInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
NSTimeInterval animationDuration =
[[notificationInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue];
CGRect frame = self.textField.frame;
// the keyboard rect's width and height are reversed in landscape
NSInteger adjustDelta = UIInterfaceOrientationIsPortrait(self.interfaceOrientation) ? CGRectGetHeight(keyboardRect) : CGRectGetWidth(keyboardRect);
if (showKeyboard)
frame.size.height -= adjustDelta;
else
frame.size.height += adjustDelta;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
self.textField.frame = frame;
[UIView commitAnimations];
}
- (void)keyboardWillShow:(NSNotification *)aNotification
{
[self adjustViewForKeyboardReveal:YES notificationInfo:[aNotification userInfo]];
}
- (void)keyboardWillHide:(NSNotification *)aNotification
{
[self adjustViewForKeyboardReveal:NO notificationInfo:[aNotification userInfo]];
}
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if (sender != self.saveButton) return;
if (self.textField.text.length > 0) {
self.note = [[NMNote alloc] init];
self.note.content = self.textField.text;
}
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
if (self.passedInString != nil) {
self.textField.text = self.passedInString;
}
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
答案 0 :(得分：2)
控制台输出的前两行告诉你一切......
2014-04-05 00:12:21.832 Robonote[20893:70b] -[UITableViewCell content]: unrecognized selector sent to instance 0x8acb5a0
2014-04-05 00:12:21.874 Robonote[20893:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITableViewCell content]: unrecognized selector sent to instance 0x8acb5a0'
看起来您在content上调用了UITableviewCell方法，但此方法未在任何地方声明。尝试检查您的代码（查看内部为UITableView的控制器）并查找调用[UITableViewCell content]方法的行。
他得到了......在你的NMCreateNotesViewController中，没有任何contet方法，但你是用prepareForSegue:sender:方法调用它。
答案 1 :(得分：2)
问题在于您如何访问要传递的记事，
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:@"noteSegue"]) {
NMCreateNotesViewController *destination = [segue destinationViewController];
NMNote *note = (NMNote*) sender;
destination.textField.text = note.content;
}
}
这应该是，
- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(UITableViewCell *)sender
{
if ([[segue identifier] isEqualToString:@"noteSegue"]) {
NMCreateNotesViewController *destination = [segue destinationViewController];
NSInteger indx = [self.tableView indexPathForCell:sender].row;
NMNote *note = self.notes[indx];
destination.passedInString = note.content;
}
}
您遇到的另一个问题是尝试从prepareForSegue设置目标视图控制器中textField的值。你不能这样做，因为控制器的视图还没有被加载，所以它的出口将是零。相反，在NMCreateNotesViewController中创建一个字符串属性（我称之为passInString），并使用它在viewDidLoad方法中设置文本字段的文本。
如果你的segue从单元格连接到下一个控制器，那么你不应该在代码中调用performSegueWithIdentifier：实际上，您根本不需要实现didSelectRowAtIndexPath：。