*** -[CFString rangeOfString:options:]: 消息发送到已释放实例 0xbe253f0

Question

我创建了一个带有搜索栏的 UITableView。首次访问 TableView 并搜索一切正常。当视图卸载并且您返回搜索选项并尝试再次搜索时，就会出现问题。

    - (void)viewDidLoad {
        [super viewDidLoad];
        self.listContent = [[NSMutableArray alloc] initWithCapacity:20];
        self.filteredListContent = [NSMutableArray arrayWithCapacity:[listContent count]];
        ...
    }

    - (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope {
        [self.filteredListContent removeAllObjects]; // First clear the filtered array.

        /*
         Search the main list for buildings whose name match searchText; add items that match to the filtered array.
         */


        for (NSArray*rows in self.listContent)
        {
            for (NSDictionary *row  in rows)
            {
                NSString *locationName =  [row objectForKey:@"Name"];

                // TODO: BUG - *** -[CFString rangeOfString:options:]: message sent to deallocated instance 0xbe253f0
                NSRange titleResultsRange = [locationName rangeOfString:searchText options:NSCaseInsensitiveSearch];

                if (titleResultsRange.length > 0) 
                {
                    [filteredListContent addObject:row];
                }
            }
        }
    }


    -(void) locationsReceived:(NSData *)data {

        NSString *jsonData = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
        // Create a dictionary from the JSON string
        NSArray *items = [[[jsonData JSONValue] objectForKey:@"ResultSet"] objectForKey:@"Location"];

        // Create a dictionary from the JSON string
        [listContent release];
        listContent = nil;
        self.listContent = [[NSMutableArray alloc] initWithCapacity:20];

        for (NSDictionary *section in  sectionTitles) {

            NSMutableArray *rows = [[NSMutableArray alloc] initWithCapacity:20];

            [self.listContent addObject:rows];

            for (NSDictionary *item in items) {

                NSInteger sectionCampus = [[section objectForKey:@"CampusID"] intValue];
                NSInteger rowCampus = [[item objectForKey:@"CampusID"] intValue];

                if (sectionCampus == rowCampus ) {
                    //NSDictionary *newDic = [[NSDictionary alloc] initWithDictionary:item copyItems:YES];
                    //[rows addObject:newDic ];
                    //[newDic release];
                    [rows addObject:item ];

                } else {
                    break;
                }
            }
        }
    }


- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
    /*
     Update the filtered array based on the search text and scope.
     */

    [self.filteredListContent removeAllObjects]; // First clear the filtered array.

    /*
     Search the main list for buildings whose name matches searchText; add items that match to the filtered array.
     */
    for (NSArray*rows in listContent)
    {
        for (NSDictionary *row  in rows)
        {
            NSString *locationName =  [row objectForKey:@"Name"];

            // TODO: BUG - *** -[CFString rangeOfString:options:]: message sent to deallocated instance 0xbe253f0
            NSRange titleResultsRange = [locationName rangeOfString:searchText options:NSCaseInsensitiveSearch];

            if (titleResultsRange.length > 0) 
            {
                [filteredListContent addObject:row];
            }
        }
    }
}

Answer 1

我宁愿清空-(void) locationsReceived:(NSData *)data 中的现有listContent 而不是分配一个新的。