Objective c 如何在NSMUtableArray中发送多个列以及如何实现它

我想使用NSMutableArray提取具有2列的结果。 -“名称”列-->用于在用户开始键入内容时在tableview中显示 -“地址”列-->将用于发送到另一个视图

以下是我的工作：

        @interface ViewController ()
        {
            ViewController *SampleViewController;
            NSMutableArray *totalStrings;
            NSMutableArray *filteredStrings;
            BOOL isFiltered;

        }


        @implementation ViewController

        - (void)viewDidLoad {
            [self createOrOpenDB]; ////Call database


            NSMutableArray* result=[[NSMutableArray alloc] init];

            NSString *ask = [NSString stringWithFormat:@"SELECT * FROM tb_001"];
            sqlite3_stmt *statement;
            const char *query_statement = [ask UTF8String];
            const char *dbpath = [_DBPath UTF8String];
            if (sqlite3_open(dbpath, &_iDB) == SQLITE_OK){
                {
                    if (sqlite3_prepare_v2(_iDB, query_statement, -1, &statement, nil) == SQLITE_OK)
                    {
                        while (sqlite3_step(statement) == SQLITE_ROW)
                        {
                            NSString *nameField = [[NSString alloc] initWithUTF8String:(const char *)sqlite3_column_text(statement, 1)];
                            NSString *addressField = [[NSString alloc] initWithUTF8String:(const char *)sqlite3_column_text(statement, 2)];


                            //add your namefield here.
                            [result addObject:xxxxxxxxxxxxxxx];

                        }

                        sqlite3_finalize(statement);
                        sqlite3_close(_iDB);
                    }
                }
                totalStrings=[[NSMutableArray alloc] initWithArray:result];
            }

Here is where I will use the first column

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{

    if (searchText.length ==0){
        isFiltered = NO;
    }
    else
    {
        isFiltered = YES;
        filteredStrings =[[NSMutableArray alloc]init];

        for (NSString *str in totalStrings) {
            NSRange StringRange = [str rangeOfString:searchText options:NSCaseInsensitiveSearch];

            if (StringRange.location !=NSNotFound) {
                [filteredStrings addObject:str];
            }
        }
    }
    [self.myTableView reloadData];
}

-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
    [self.myTableView resignFirstResponder];
}

//table view datasource and delegate methods

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (isFiltered){
        return [filteredStrings count];
    }
    return [totalStrings count];
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *CellIdentifier= @"Cell";
    UITableViewCell *cell =[tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (!cell){
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
    if(!isFiltered){
        cell.textLabel.text =[totalStrings objectAtIndex:indexPath.row];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
    else{ //It is filtered
        cell.textLabel.text = [filteredStrings objectAtIndex:indexPath.row];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
    return cell;
}




    - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
    {

        //here I want to use result from another column (address)
        LadyGagaVC *dada =[self.storyboard 
        [dada setText:[resilt_from_anothercolomn objectAtIndex:indexPath.row]];

    }

如何将其放入正确的数组并使用它？

---

我知道我必须使用for循环，但现在我不知道。

您可以使用

NSDictionary

，如下所示：

 NSString *nameField    = [[NSString alloc] initWithUTF8String:(const char *)sqlite3_column_text(statement, 1)];
 NSString *addressField = [[NSString alloc] initWithUTF8String:(const char *)sqlite3_column_text(statement, 2)];

 NSDictionary *data = @{@"name":nameField,
                     @"address":addressField};
 //add your namefield here.
 [result addObject:data];

然后：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
    {

        //here I want to use result from another column (address)
        LadyGagaVC *vc = ...
        NSDictionary *dic = totalStrings[indexPath.row];
        NSString *name = dic[@"name"];
        NSString *address = dic[@"address"];            
        //Use this values as you want...
    }

或者最好创建一个类（模型），比如MyModel，它将具有两个属性：

@interface  MyModel : NSObject
@property (strong, nonatomic) NSString *name;
@property (strong, nonatomic) NSString *address;
@end

使用

MyModel

的实例代替字典。例如

MyModel *model = [MyModel new];
model.name    = nameField;
model.address = addressField;
[result addObject:model];

---

问题是如何实现上面的第一个for循环？如果第一个for循环没有实现，那么tableview将不会显示。我通过添加两个结果并将其分隔来找到它。一个结果用于表视图，另一个结果用于另一个viewcontroller。它起作用了。但是看起来很复杂。但是对于班级模式，我不知道为什么它不起作用。那门课放在哪里。h文件？顺便说一句，我强烈建议您使用sqlite的第三方库，因为您的代码将更加干净易读。谢谢您的回答和推荐。我有一个问题：如何在“totalstrings”中使用model.name？那么，您应该使用不同的名称，例如totalObjects，而不是

totalstrings

。totalObject中的每个对象都是类

MyModel

，因此

MyModel*model=totalObject[someIndex]；型号。名称