Question

我有一个解析iOS应用程序，我需要搜索几千个用户的名字（~3,000）。我正在尝试修改我的搜索代码，以便我可以这样做，但我需要帮助。现在我的搜索代码如下所示：

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    if (tableView == self.tableView) {

        return self.objects.count;

    } else {
        return self.searchResults.count;

    }

}


-(void)filterResults:(NSString *)searchTerm :(int)limit :(int)skip {


    [self.searchResults removeAllObjects];

    PFQuery *query = [PFQuery queryWithClassName:@"_User"];
    [query whereKey:@"isTeacher" equalTo:@"False"];
    [query setLimit: limit];
    [query setSkip: skip];

    [[[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (objects.count == limit) {
            [self performTeacherQueryWithLimit:limit andSkip:skip+limit];
        }

        else{
        NSArray *results = [NSArray arrayWithArray:objects];

        NSLog(@"%@", results);
        NSLog(@"%lu", (unsigned long)results.count);
        NSLog(@"results^");


        [self.searchResults addObjectsFromArray:results];

        NSPredicate *searchPredicate =
        [NSPredicate predicateWithFormat:@"SELF.name contains[c] %@",searchTerm];
        _searchResults = [NSMutableArray arrayWithArray:[results filteredArrayUsingPredicate:searchPredicate]];
        [self.searchDisplayController.searchResultsTableView reloadData];

        NSLog(@"%@", _searchResults);
        NSLog(@"%lu", (unsigned long)_searchResults.count);
        NSLog(@"search results^");
        }

    }];
    ]]

}

-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
    [self filterResults:searchString];
    return YES;
}

这段代码不起作用，因为我在底部调用filterResults而没有所有正确的参数，但这是因为我已经到了一半，现在我被卡住了。我知道我需要使用setSkip，但我不确定如何为我的搜索工作。任何帮助都是极好的！谢谢！

Answer 1

我使用一种方法来处理查询及其结果，如下所示：

- (void)runQuery:(PFQuery *)query filling:(NSMutableArray *)array completion:(void (^)(BOOL))completion {
    query.skip = array.count;
    [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (!error) {
            [array addObjectsFromArray:objects];
            if (objects.count < query.limit) {
                return completion(YES);
            } else {
                [self runQuery:query filling:array completion:completion];
            }
        } else {
            return completion(NO);
        }
    }];
}

像这样使用：

PFQuery *query = [PFQuery queryWithClassName:@"MyClass"];
// setup query
query.limit = // set this to a reasonable size
// the given method will do ceil(N / limit) finds, where N is the number
// of rows that satisfy the query

NSMutableArray *array = [@[] mutableCopy];
[self runQuery:query filling:array completion:^(BOOL success) {
    NSLog(@"%@", array);
    // you would do your local search and set search results here
}];

更具功能性的版本会在查询之间调用进度块。这将允许您不断更新结果。为此，只需添加进度块参数并在[array addObjectsFromArray:objects];之后立即调用。

在解析iOS中搜索1000多个查询

1 个答案: