Ios 数组objectAtIndex:越界错误

所以最近，我在弄清楚如何为uicollectionview创建搜索栏时遇到了麻烦。幸运的是，有人能帮我回答这个问题。然而，因为我的应用程序的滚动速度非常慢而且有问题，我决定实现一个异步请求，让图像在后台加载，从而更快地加载

问题是，包含搜索查询的数组无法重新加载uicollectionview，因为异步请求正在干扰它。或者至少，这就是我认为的问题所在，如果问题出在其他地方，请告诉我

这是我一直收到的错误消息：

2014-07-21 16:28:22.199 A Great App for TF2[545:70b] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 1 beyond bounds [0 .. 0]'
*** First throw call stack:
(
    0   CoreFoundation                      0x01c2e5e4 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x019b18b6 objc_exception_throw + 44
    2   CoreFoundation                      0x01bcf4e6 -[__NSArrayM objectAtIndex:] + 246
    3   CoreFoundation                      0x01cad608 -[NSArray objectAtIndexedSubscript:] + 40
    4   A Great App for TF2                 0x0001ebf1 __62-[MasterViewController collectionView:cellForItemAtIndexPath:]_block_invoke + 289
    5   Foundation                          0x016cd695 __67+[NSURLConnection sendAsynchronousRequest:queue:completionHandler:]_block_invoke_2 + 151
    6   Foundation                          0x0162d945 -[NSBlockOperation main] + 88
    7   Foundation                          0x01686829 -[__NSOperationInternal _start:] + 671
    8   Foundation                          0x01603558 -[NSOperation start] + 83
    9   Foundation                          0x01688af4 __NSOQSchedule_f + 62
    10  libdispatch.dylib                   0x063454b0 _dispatch_client_callout + 14
    11  libdispatch.dylib                   0x0633375e _dispatch_main_queue_callback_4CF + 340
    12  CoreFoundation                      0x01c93a5e __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 14
    13  CoreFoundation                      0x01bd46bb __CFRunLoopRun + 1963
    14  CoreFoundation                      0x01bd3ac3 CFRunLoopRunSpecific + 467
    15  CoreFoundation                      0x01bd38db CFRunLoopRunInMode + 123
    16  GraphicsServices                    0x02fce9e2 GSEventRunModal + 192
    17  GraphicsServices                    0x02fce809 GSEventRun + 104
    18  UIKit                               0x0071fd3b UIApplicationMain + 1225
    19  A Great App for TF2                 0x000235dd main + 141
    20  libdyld.dylib                       0x065d770d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

我的代码

这相当长，因为我使用了一个编写很长的api调用来生成集合视图中的单元格。我将尝试删除代码中不必要的部分

MasterViewController.m

如果您想下载我的项目以单独查看文件，请访问。该类称为MasterViewController.m

---

任何帮助都将不胜感激。

啊，看起来主持人悄悄地删除了一些评论。你需要对崩溃报告进行符号化，以便准确地知道是哪行代码导致了崩溃。我们知道它来自collectionView:cellForItemAtIndexPath:方法，这是由于从数组中获取对象的调用。但是你的方法对数组进行了多次调用，所以我们不知道哪一个是问题所在。方法返回_groups数组中的对象数。但是您的cellForItemAtIndexPath:方法正在从backpackItems数组获取数据。那是可疑的。那可能是我被解雇的原因吗error@VarunIyer是的，这就是我提到它的原因。您的表视图数据源和委托方法需要一致性。仅供参考-当你回复某人时-在他们的用户名前加上@符号，以便他们收到你的消息。

@interface MasterViewController () <SteamManagerDelegate> {
    NSArray *_groups;
    NSArray *_itemGroups;
    NSArray *_backpackItems;
    NSArray *_backpackItemPhotos;
    SteamManager *_manager;

}

@property (nonatomic, strong) NSMutableArray *dataSource, *originalDataSource, *backpackSource;
@end

@implementation MasterViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.collectionView.dataSource = self;
    self.collectionView.delegate = self;
    self.automaticallyAdjustsScrollViewInsets = NO;

    UISearchBar *searchBar = [UISearchBar new];
    searchBar.delegate = self;
    searchBar.showsCancelButton = YES;
    self.navigationItem.titleView = searchBar;



    _manager = [[SteamManager alloc] init];

    _manager.communicator = [[SteamCommunicator alloc] init];
    _manager.communicator.delegate = _manager;
    _manager.delegate = self;
    [self startFetchingGroups];
    loadingView = [[UIView alloc] initWithFrame:CGRectMake(75, 155, 170, 170)];
    loadingView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.5];
    loadingView.clipsToBounds = YES;
    loadingView.layer.cornerRadius = 10.0;

    activityView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    activityView.frame = CGRectMake(65, 40, activityView.bounds.size.width, activityView.bounds.size.height);
    [loadingView addSubview:activityView];

    loadingLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 115, 130, 22)];
    loadingLabel.backgroundColor = [UIColor clearColor];
    loadingLabel.textColor = [UIColor whiteColor];
    loadingLabel.adjustsFontSizeToFitWidth = YES;
    loadingLabel.textAlignment  = UITextAlignmentCenter;
    loadingLabel.text = @"Loading...";
    [loadingView addSubview:loadingLabel];

    [self.view addSubview:loadingView];
    [activityView startAnimating];

}

#pragma mark - Notification Observer
- (void)startFetchingGroups
{
    [_manager fetchGroups];
}

#pragma mark - SteamManagerDelegate
- (void)didReceiveGroups:(NSArray *)groups
{
    _groups = groups;
}

- (void)didReceieveItemGroups:(NSArray *)groups
{
    _itemGroups = groups;
    _backpackItems = [self createBackpackIcons:_groups
                               usingItemGroups:_itemGroups];
    _dataSource = [[NSMutableArray alloc] init];

    for(NSUInteger i = 0; i < _backpackItems.count; i++){
        backpackIcons *items = _backpackItems[i];
        [_dataSource addObject:items.name];
    }
    self.originalDataSource = self.dataSource;



    dispatch_async(dispatch_get_main_queue(), ^{


        [self.collectionView reloadData];

        [activityView stopAnimating];
        [loadingView removeFromSuperview];
        });
}

#pragma mark - Collection View
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
        return _groups.count;
    }


- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *identifier = @"Cell";
    backpackIcons *item = _backpackItems[indexPath.row];
    NSString *photoURL = item.image_url;
    NSString *quality = item.quality;
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
    UIImageView *itemImageView = (UIImageView *)[cell viewWithTag:100];
    UILabel *itemName = (UILabel *) [cell viewWithTag:110];

    NSLog([NSString stringWithFormat:@"%d", _dataSource.count]);
        //backpackIcons *item1 = _dataSource[indexPath.row];

    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:photoURL]];
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
        [itemImageView setImage:[UIImage imageWithData:data]];
        [itemName setText:_dataSource[indexPath.row]];


    }];

    /*itemImageView.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:photoURL]]];*/
    [itemImageView setBackgroundColor:Rgb2UIColor(60, 53, 46)];
    if([[NSString stringWithFormat:@"%@", quality] isEqualToString:@"6"])
    {
        [itemImageView.layer setBorderColor:[Rgb2UIColor(125, 109, 0) CGColor]];
    }
    else if([[NSString stringWithFormat:@"%@", quality] isEqualToString:@"1"])
    {
        [itemImageView.layer setBorderColor:[Rgb2UIColor(77, 116, 85) CGColor]];
    }
    else if ([[NSString stringWithFormat:@"%@", quality] isEqualToString:@"3"])
    {
        [itemImageView.layer setBorderColor:[Rgb2UIColor(71, 98, 145) CGColor]];
    }
    else if ([[NSString stringWithFormat:@"%@", quality] isEqualToString:@"5"])
    {
        [itemImageView.layer setBorderColor:[Rgb2UIColor(134, 80, 172) CGColor]];
    }
    else if ([[NSString stringWithFormat:@"%@", quality] isEqualToString:@"11"])
    {
        [itemImageView.layer setBorderColor:[Rgb2UIColor(207, 106, 50) CGColor]];
    }
    else if ([[NSString stringWithFormat:@"%@", quality] isEqualToString:@"7"] || [[NSString stringWithFormat:@"%@", quality] isEqualToString:@"9"])
    {
        [itemImageView.layer setBorderColor:[Rgb2UIColor(112, 176, 74) CGColor]];
    }
    else if ([[NSString stringWithFormat:@"%@", quality] isEqualToString:@"8"])
    {
        [itemImageView.layer setBorderColor:[Rgb2UIColor(165, 15, 121) CGColor]];
    }
    else if ([[NSString stringWithFormat:@"%@", quality] isEqualToString:@"0"])
    {
        [itemImageView.layer setBorderColor:[Rgb2UIColor(178, 178, 178) CGColor]];
    }
    else if ([[NSString stringWithFormat:@"%@", quality] isEqualToString:@"13"])
    {
        [itemImageView.layer setBorderColor:[Rgb2UIColor(56, 243, 171) CGColor]];
    }
    else
    {
        [itemImageView.layer setBorderColor:[Rgb2UIColor(170, 0, 0) CGColor]];
    }
        [itemImageView.layer setBorderWidth: 1.0];

    return cell;
}

#pragma mark UISearchBarDelegate

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    [self applyFilters:[NSSet setWithObject:searchBar.text]];
    [searchBar resignFirstResponder];
}

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar {
    [searchBar resignFirstResponder];
}

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
    if (![searchText length]) {
        self.dataSource = self.originalDataSource;
        [self.collectionView reloadData];
    }
}

#pragma mark private

- (void)applyFilters:(NSSet *)filters {
    NSMutableArray *newData = [NSMutableArray array];
    for (NSString *s in self.dataSource) {
        for (NSString *filter in filters) {
            if ([s rangeOfString:filter].location != NSNotFound) {
                [newData addObject:s];
                break;
            }
        }
    }
    self.dataSource = newData;

    [self.collectionView reloadData];
}