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出于某种原因，以下 NSData 行导致我的应用程序崩溃。这是控制台向我抛出的错误：

* 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“NSConcreteAttributedString initWithString::nil value” *

有谁知道这可能是为什么？我正在使用 XCode 5，在 XCode 4 中构建时似乎没有这个问题。是否有替代的代码字符串可以解决这个问题？如果我删除这些行，则不会发生崩溃。但是，我需要保存我的数据，哈哈。

    NSData *dataSave = [NSKeyedArchiver archivedDataWithRootObject:strainsfinal];

视图控制器.m

-(void)arrayUpdated
{
    Strains = appdelegate.strainsfinal;
    [StrainTableView reloadData];

    NSLog(@"notification received");
}


- (int)numberOfSectionsInTableView: (UITableView *)tableview
{
    return 1;
}

- (int)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        return [searchResults count];
    } else {
        return [Strains count];
    }
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *strainTableIdentifier = @"StrainTableCell";

    StrainTableCell *cell = (StrainTableCell *)[tableView dequeueReusableCellWithIdentifier:strainTableIdentifier];
    if (cell == nil)


        cell = [[StrainTableCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:strainTableIdentifier];

    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    cell.selectionStyle = UITableViewCellSelectionStyleBlue;



    NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"StrainTableCell" owner:self options:nil];
    cell = [nib objectAtIndex:0];

    if (tableView == self.searchDisplayController.searchResultsTableView) {
        NSLog(@"Using the search results");

        cell.titleLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Title"];
        cell.descriptionLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Description"];
        cell.ratingLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Rating"];
        cell.ailmentLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Ailment"];
        cell.actionLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Action"];
        cell.ingestLabel.text = [[searchResults objectAtIndex:indexPath.row] objectForKey:@"Ingestion"];

        NSLog(@"%@", searchResults);



    } else {
        NSLog(@"Using the FULL LIST!!");
        cell.titleLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Title"];
        cell.descriptionLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Description"];
        cell.ratingLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Rating"];
        cell.ailmentLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Ailment"];
        cell.actionLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Action"];
        cell.ingestLabel.text = [[Strains objectAtIndex:indexPath.row] objectForKey:@"Ingestion"];

    }

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    strainsfinal = [[NSMutableArray alloc] init];
    NSData *dataSave = [[NSUserDefaults standardUserDefaults] objectForKey:@"strains"];
    if (dataSave != Nil) {
        Strains = [NSKeyedUnarchiver unarchiveObjectWithData:dataSave];
        // strainsfinal = [Strains copy];
    }
    // Override point for customization after application launch.

    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    NSURL *url = [NSURL URLWithString:@"http://urlhere.com/file.php"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [[NSURLConnection alloc] initWithRequest:request delegate:self];
    bool firstlaunch = [[NSUserDefaults standardUserDefaults] boolForKey:@"firstlaunch"];
    if (firstlaunch != YES) {



        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"arthritisswitch"];

        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"cancerswitch"];

        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"hivswitch"];

        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"insomniaswitch"];

        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"migrainesswitch"];

        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstlaunch"];

    }



    // Do any additional setup after loading the view, typically from a nib.
    return YES;
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    data = [[NSMutableData alloc] init];

}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)theData
{
    [data appendData:theData];

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    NSData *dataSave = [[NSUserDefaults standardUserDefaults] objectForKey:@"strains"];
    NSMutableArray *oldStrains = [NSKeyedUnarchiver unarchiveObjectWithData:dataSave];

    NSMutableSet *blankArray = [[NSMutableSet alloc] init];

    // Strains = [NSJSONSerialization JSONObjectWithData:data options:nil error:nil];
    Strains = [NSJSONSerialization JSONObjectWithData: data options: NSJSONReadingMutableContainers error:nil];
    if (oldStrains.count < Strains.count) {
        for (int x = oldStrains.count - 1; x < Strains.count; x++) {
            [oldStrains addObject:[Strains objectAtIndex:x]];
        }

    }
    if (Strains.count > 0) {


        blankArray = [Strains copy];

        NSSortDescriptor *sortDescriptor = nil;

        sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"Title"
                                                     ascending:YES];
        NSArray *sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
        Strains = [[blankArray allObjects] sortedArrayUsingDescriptors:sortDescriptors];

        int count = 0;
        for (NSDictionary *item in Strains) {
            [item setValue:[NSNumber numberWithInt:count] forKey:@"position"];
            if ([item valueForKey:@"checked"] ==  nil) {
                bool checked = NO;
                [item setValue:[NSNumber numberWithBool:checked]  forKey:@"checked"];
            }
            count++;
        }

        dataSave = [NSKeyedArchiver archivedDataWithRootObject:Strains];
        [[NSUserDefaults standardUserDefaults] setObject:dataSave forKey:@"strains"];
        [strainsfinal addObjectsFromArray:Strains];
    }

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    UIAlertView *errorView = [[UIAlertView alloc] initWithTitle:@"Error" message:@"The download could not complete - please make sure that you're connected to 3G or Wi-Fi." delegate:nil
                                              cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];
    [errorView show];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;


}


-(void)updateStrains:(NSDictionary *)item
{
    /*
     NSLog(@"updating items");
     NSNumber *position = [NSNumber numberWithInt:[[item objectForKey:@"position"] intValue]];
     NSIndexPath *itemIndex = [NSIndexPath indexPathForRow:[position intValue] inSection:0];
     NSLog(@"%@",itemIndex);
     [strainsfinal replaceObjectAtIndex:itemIndex.row withObject:item];
     */

    NSData *dataSave = [NSKeyedArchiver archivedDataWithRootObject:strainsfinal];
    [[NSUserDefaults standardUserDefaults] setObject:dataSave forKey:@"strains"];
    NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];
    [nc postNotificationName:@"arrayupdated" object:self userInfo:nil];


}
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