Question

我有一个带有tableview的应用程序，您可以添加和删除项目，但是当我尝试实现搜索栏时，只要我键入一个字母就会崩溃。这是我正在使用的代码：

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
    if (searchText.length == 0) {
        isFiltered = NO;
    } else {
        isFiltered = YES;

        filteredPatients = [[NSMutableArray alloc] init];

        for (Patient *patient in patients) {
            NSRange patientNameRange = [patient.patientName rangeOfString:searchText options:NSCaseInsensitiveSearch];

            if (patientNameRange.location != NSNotFound) {
                [filteredPatients addObject:patient];
            }
        }
    }
    [self.tableView reloadData];
}

这种方法很好，但是当你输入一个有病人的字母时，它会在这一行中断开：

cell.textLabel.text = [filteredPatients objectAtIndex:indexPath.row];

以下是上下文中的代码：

- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tv dequeueReusableCellWithIdentifier:@"cell"];
    if ( nil == cell ) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
    }

    NSLog(@"indexPath.row = %d, patients.count = %d", indexPath.row, patients.count);
    Patient *thisPatient = [patients objectAtIndex:indexPath.row];

    if (isFiltered == YES) {
        cell.textLabel.text = [filteredPatients objectAtIndex:indexPath.row];
    } else {
        cell.textLabel.text = [NSString stringWithFormat:@"%@ %@", thisPatient.patientName, thisPatient.patientSurname];
    }

    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    cell.textLabel.textColor = [UIColor blackColor];
    if (self.editing) {
        [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
    }
    return cell;
}

并返回此错误

-[Patient isEqualToString:]: unrecognized selector sent to instance 0x756c180

如果您想要更多代码，请询问。

提前致谢

Answer 1

您正在迭代似乎包含patients个实例而非Patient个实例的集合NSString。所以我会做类似的事情：

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
    if (searchText.length == 0) {
        isFiltered = NO;
    } else {
        isFiltered = YES;

        filteredPatients = [[NSMutableArray alloc] init];

        for (Patient *patient in patients) {
            NSRange patientNameRange = [patient.name rangeOfString:searchText options:NSCaseInsensitiveSearch];

            if (patientNameRange.location != NSNotFound) {
                [filteredPatients addObject:patient];
            }
        }
    }
    [self.tableView reloadData];
}

实现文本时UISearchBar崩溃

1 个答案: