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我有一个.json本地存储的文件，我在加载文件路径之后将其加载到一个名为的数组countries中countries = (NSArray *)[NSJSONSerialization JSONObjectWithData [fileContents dataUsingEncoding:NSUTF8StringEncoding] options:0 error:NULL];。我将.jsonintocountries数组加载为：

 NSString * filePath =[[NSBundle mainBundle] pathForResource:@"countries" ofType:@"json"];
    NSError * error;
    NSString* fileContents =[NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&error];


    if(error||!filePath)
    {
        NSLog(@"Error reading file: %@",error.localizedDescription);
    }

    countries = (NSArray *)[NSJSONSerialization
                                JSONObjectWithData:[fileContents dataUsingEncoding:NSUTF8StringEncoding]
                                options:0 error:NULL];



之后，我接受了一个NSMutableArray调用displayItems并将其初始化为displayItems = [[NSMutableArray alloc] initWithArray:countries];. 与我使用的委托方法相比

，在给出之后意味着它正确地获取了值，并且请参见下图以了解问题的层次结构： 基于断点，此方法正在产生问题。UITableViewdisplayItemscountNSLog248cellForRowAtIndexPathdidSelectRowAtIndexPath

ViewController这是我的视图控制器的层次结构，带有表格视图和搜索栏 

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{
    if ([searchText length] == 0) {
        [displayItems removeAllObjects];
        [displayItems addObjectsFromArray:countries];
    } else {
        [displayItems removeAllObjects];
        for (NSString *string  in countries) {
            NSRange r = [string rangeOfString:searchText options:NSCaseInsensitiveSearch];
            if (r.location != NSNotFound) {
                [displayItems addObject:string];
            }
        }
    }
    [tableView reloadData];
}

当它到达该行时Range r，应用程序崩溃并且错误为unrecognized selector sent to instance.
一切都很好，直到我在UISearchBar应用程序崩溃时输入一个字母。

确切的错误是：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary rangeOfString:options:]: unrecognized selector sent to instance 0x12ddd5e90'
*** First throw call stack:
(0x180a55900 0x1800c3f80 0x180a5c61c 0x180a595b8 0x18095d68c 0x1000d0e3c 0x185953d28 0x18577fe50 0x18577fdcc 0x185767a88 0x185953ad4 0x18578a8f8 0x18591fee8 0x18591f104 0x185aafae4 0x186095b20 0x18591ee70 0x185b5cc90 0x185b5c854 0x185772e84 0x181417e20 0x180a0cefc 0x180a0c990 0x180a0a690 0x180939680 0x181e48088 0x1857b0d90 0x1000e0e94 0x1804da8b8)
libc++abi.dylib: terminating with uncaught exception of type NSException
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