xcode NSMutableArray 获取 [__NSCFString count]：无法识别的选择器发送到实例

NSMutableArray getting [__NSCFString count]: unrecognized selector sent to instance

提问by Razvan

I really need some help...

我真的需要一些帮助...

When I try to get the number of cells for section using a NSMutableArray, I get [__NSCFString count]: unrecognized selector sent to instance 0x6d567e0

当我尝试使用 NSMutableArray 获取部分的单元格数时，我得到 [__NSCFString count]: unrecognized selector sent to instance 0x6d567e0

This happens when I use "rows = [[searchProfile objectAtIndex:section] count];"

当我使用“rows = [[searchProfile objectAtIndex:section] count];”时会发生这种情况

Here is the code:

这是代码：

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    NSLog(@"1");
    // _________ Return the number of sections ________
    int sections =  0;

    if (tableView == self.tableView)
    {
        sections = 2;
    }
    if (tableView == self.searchDisplayController.searchResultsTableView)
    {
        sections = [searchedProfile count];
    }
    return sections;
}


/* ------------------------------------------ Set The Number Of Cells for Each Section ------------------------------- */


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSLog(@"2");

    // _________  Return the number of rows in the section. ________
    int rows = 0;

    if (tableView == self.tableView)
    {
        if (section == 0) {
            rows = userProfile.count;}
        else {
            rows = profiles.count;}
    }

    if (tableView == self.searchDisplayController.searchResultsTableView)
    {
        rows = [[searchedProfile objectAtIndex:section]count];
    }
    return rows;
}

And the method that inserts strings into "searchedProfile" array:

以及将字符串插入“searchedProfile”数组的方法：

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    searchedKeys = [NSMutableArray array];
    searchedProfile = [NSMutableArray array];
    searchedData = [NSMutableDictionary dictionary];

    [searchedProfile removeAllObjects];
    [searchedData removeAllObjects];
    [searchedKeys removeAllObjects];


        NSDictionary *profile;

        for (profile in profiles)
        {
            NSString *birthname;
            NSString *currentname;
            NSString *photopath;
            NSDate *birthdate;

            for (birthname in profile)
            {
                birthname = [profile objectForKey:@"birthname"];
                currentname = [profile objectForKey:@"currentname"];
                photopath = [profile objectForKey:@"profilepic"];
                birthdate = [profile objectForKey:@"birthdate"];
                NSRange nameRange = [birthname rangeOfString:searchString options:NSCaseInsensitiveSearch];

                if (nameRange.location != NSNotFound)
                {
                    [searchedProfile addObject:birthname];
                    [searchedData setObject:birthname forKey:@"birthname"];
                    [searchedData setObject:currentname forKey:@"currentname"];
                    [searchedData setObject:photopath forKey:@"profilepic"];
                    [searchedData setObject:birthdate forKey:@"birthdate"];
                    if ([birthname isEqualToString:[profile objectForKey:@"birthname"]])
                        break;
                }
            }
        }
    NSLog(@"SEARCHED PROFILES: %@", searchedProfile);
    NSLog(@"SEARCHED DATA:%@", searchedData);
    NSLog(@"SEARCHED KEYS:%@", searchedKeys);
    NSLog(@"count test: %d", searchedProfile.count);
    return YES;
}

Thank you !

谢谢 ！

回答by pasawaya

It looks like you're using the countmethod for NSArray's on an NSString, which is not allowed. You store NSStrings in the array searchedProfile, and it looks like you want to find out the length of a string. So instead of this:

看起来您在countNSString 上使用NSArray 的方法，这是不允许的。您将 NSStrings 存储在数组中searchedProfile，看起来您想找出字符串的长度。所以而不是这个：

    rows = [[searchedProfile objectAtIndex:section] count];

Do this:

做这个：

    rows = [[searchedProfile objectAtIndex:section] length];

回答by Neo

[searchedProfile objectAtIndex:section]will return string as the object in searchedProfile is string because this is how u added object before

[searchedProfile objectAtIndex:section]将返回字符串，因为 searchedProfile 中的对象是字符串，因为这是您之前添加对象的方式

 [searchedProfile addObject:birthname];

and countisnt the property defined for NSString. Anyways, it seems you want to return number of objects(i.e. number of birthnames stored in the searchedProfile array ) as the number of rows in the table, try this

并且count不是为 NSString 定义的属性。无论如何，您似乎想返回对象数（即存储在 searchedProfile 数组中的出生姓名数）作为表中的行数，试试这个

rows = [searchedProfile count];

回答by Raghunandan R

Retain "searchedProfile" array by doing: searchedProfile = [[NSArray array] retain];

通过执行以下操作保留“searchedProfile”数组：searchedProfile = [[NSArray array] retain];