我遇到一个特定的错误；我在此行上收到“SIGABRT”:
cell.textLabel.text = [collections objectAtIndex: [indexPath row]];
我的头文件:
#import <UIKit/UIKit.h>
@interface CollectionsViewController : UITableViewController {
NSMutableArray *collections;
NSMutableData *responseData;
}
@property (nonatomic, retain) NSMutableArray *collections;
@end
和实现文件:
#import "CollectionsViewController.h"
#import "JSON.h"
@implementation CollectionsViewController
@synthesize collections;
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
// 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)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
self.collections = nil;
}
- (void)viewWillAppear:(BOOL)animated
{
collections = [[NSMutableArray alloc] init];
responseData = [[NSMutableData data]retain];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.unpossible.com/misc/lucky_numbers.json"]];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
[super viewWillAppear:animated];
//[self.tableView reloadData];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[responseData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
NSLog(@"Error connecting: \"%@\"", [error description]);
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
[connection release];
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
[responseData release];
NSArray *luckyNumbers = [responseString JSONValue];
for (int i = 0; i < [luckyNumbers count]; i++)
[collections addObject:[luckyNumbers objectAtIndex:i]];
for (int j = 0; j < [collections count]; j++)
NSLog(@"This is \"%@\"", [collections objectAtIndex:j]);
[self.tableView reloadData];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[collections release];
[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 the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [collections count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell...
NSLog(@"Counter \"%u\"", [collections count]);
cell.textLabel.text = [collections objectAtIndex: [indexPath row]];
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
*/
[self.navigationController popViewControllerAnimated:YES];
}
- (void)dealloc {
[collections release];
[super dealloc];
}
@end
减去大部分已注释掉的内容。
最后是我的日志:
2011-11-15 16:41:10.366 Clarke & Clarke[834:b303] This is "13"
2011-11-15 16:41:10.367 Clarke & Clarke[834:b303] This is "3"
2011-11-15 16:41:10.368 Clarke & Clarke[834:b303] This is "73"
2011-11-15 16:41:10.368 Clarke & Clarke[834:b303] This is "31"
2011-11-15 16:41:10.369 Clarke & Clarke[834:b303] Counter "4"
2011-11-15 16:41:10.370 Clarke & Clarke[834:b303] -[NSCFNumber isEqualToString:]: unrecognized selector sent to instance 0x4b699b0
2011-11-15 16:41:10.372 Clarke & Clarke[834:b303] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFNumber isEqualToString:]: unrecognized selector sent to instance 0x4b699b0'
*** Call stack at first throw:
(
0 CoreFoundation 0x00dde5a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x00f32313 objc_exception_throw + 44
2 CoreFoundation 0x00de00bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x00d4f966 ___forwarding___ + 966
4 CoreFoundation 0x00d4f522 _CF_forwarding_prep_0 + 50
5 UIKit 0x00151afc -[UILabel setText:] + 72
6 Clarke & Clarke 0x0000316f -[CollectionsViewController tableView:cellForRowAtIndexPath:] + 399
7 UIKit 0x000a5b98 -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] + 634
8 UIKit 0x0009b4cc -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:] + 75
9 UIKit 0x000b08cc -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow:] + 1561
10 UIKit 0x000a890c -[UITableView layoutSubviews] + 242
11 QuartzCore 0x016c8a5a -[CALayer layoutSublayers] + 181
12 QuartzCore 0x016caddc CALayerLayoutIfNeeded + 220
13 QuartzCore 0x016700b4 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 310
14 QuartzCore 0x01671294 _ZN2CA11Transaction6commitEv + 292
15 QuartzCore 0x0167146d _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 99
16 CoreFoundation 0x00dbf89b __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 27
17 CoreFoundation 0x00d546e7 __CFRunLoopDoObservers + 295
18 CoreFoundation 0x00d1d1d7 __CFRunLoopRun + 1575
19 CoreFoundation 0x00d1c840 CFRunLoopRunSpecific + 208
20 CoreFoundation 0x00d1c761 CFRunLoopRunInMode + 97
21 GraphicsServices 0x010161c4 GSEventRunModal + 217
22 GraphicsServices 0x01016289 GSEventRun + 115
23 UIKit 0x0003ec93 UIApplicationMain + 1160
24 Clarke & Clarke 0x00001b29 main + 121
25 Clarke & Clarke 0x00001aa5 start + 53
26 ??? 0x00000001 0x0 + 1
)
terminate called throwing an exceptionsharedlibrary apply-load-rules all
Current language: auto; currently objective-c
我已经尝试过，但是看不到错误。有人可以教育我吗？
最佳答案
错误是2011-11-15 16:41:10.370 Clarke & Clarke[834:b303] -[NSCFNumber isEqualToString:]: unrecognized selector sent to instance 0x4b699b0
您尝试设置一个带有int的文本
首选:
cell.textLabel.text = [NSString stringWithFormat:@"%d",[collections objectAtIndex: [indexPath row]]];