Question

我对iOS开发非常陌生并使用树屋构建自毁iOS应用程序，我们使用parse.com作为后端。

我在应用中添加了一个搜索栏： -

- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar {

    //dismiss keyboard and reload table
    [self.searchBar resignFirstResponder];
    [self.tableView reloadData];
}

- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar {

    //Enable the cancel button when the user touches the search field
    self.searchBar.showsCancelButton = TRUE;
}

- (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar {

    //disable the cancel button when the user ends editing
    self.searchBar.showsCancelButton = FALSE;
}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {

    //dismiss keyboard
    [self.searchBar resignFirstResponder];

    //reset the foundUser property
    self.foundUser = nil;

    //Strip the whitespace off the end of the search text
    NSString *searchText = [self.searchBar.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];


    //Check to make sure the field isnt empty and Query parse for username in the text field
    if (![searchText isEqualToString:@""]) {

        PFQuery *query = [PFUser query];
        [query whereKey:@"username" equalTo:searchText];
        [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
            if (!error) {

                //check to make sure the query actually found a user
                if (objects.count > 0) {

                    //set your foundUser property to the user that was found by the query (we use last object since its an array)
                    self.foundUser = objects.lastObject;

                    //The query was succesful but returned no results. A user was not found, display error message
                } else {

                }

                //reload the tableView after the user searches
                [self.tableView reloadData];

            } else {

                //error occurred with query

            }

        }];

    }
}

当我们搜索用户时，我们必须完全正确地获取用户名，包括正确地获取大写/小写字母，然后按搜索以显示用户。

我希望用户显示即使我们没有得到正确的大写/小写字母，也要进行不区分大小写的搜索。此外，如果用户没有正确的用户名，我们可以为用户提供接近该用户名。

Answer 1

您应该将用户名的全部小写值保留为PFUser类的键，或者您尝试按用户名查询的任何类。将搜索词添加到PFQuery时，请确保它全部为小写。

您可以将任何字符串转换为小写字符串，如下所示：

NSString* string = @"AAA";
NSString* lowerCaseString = string.lowercaseString;

因此，当您创建用户时，您可以执行以下操作：

PFUser* user = [PFUser user];
user.username = self.usernameTextField.lowercaseString
...

然后，当您想要查询此用户时，您的查询将类似于

...
[query whereKey:@"username" containsString:searchString.lowercaseString];
...

搜索栏没有响应iOS

1 个答案: