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向可变数组添加/删除对象

nsmutablearray objective-c ios

Stefan · 技术社区 · 9 年前

我有 所有专业 阵列,以及 选定的专业 大堆我从服务器下载这些数组,将它们解析为对象,并将它们添加到这些数组中。现在,我想检查/取消检查一些专业。我试过了 containsObject ,但这不起作用,因为这些对象不在同一内存位置。这是我迄今为止完成的代码,它正在工作,但我有问题如何将它们添加到这个数组中。在里面 cellForRowAtIndexPath :

for (Speciality *specTemp in self.selectedSpecialities) {
        if (speciality.specialityId == specTemp.specialityId) {
            cell.accessoryType = UITableViewCellAccessoryCheckmark;
            break;
        }
        else {
            cell.accessoryType = UITableViewCellAccessoryNone;
        }
    }

在里面 didSelect :

Speciality *speciality = [[Speciality alloc]init];
    speciality = self.allSpecialities[indexPath.row];
    NSMutableArray *tempSelectedSpecialities = [[NSMutableArray alloc]initWithArray:self.selectedSpecialities];
    int i=0;
    for (Speciality *tempSpeciality in tempSelectedSpecialities) {
        if (tempSpeciality.specialityId == speciality.specialityId) {
            [self.selectedSpecialities removeObjectAtIndex:i];
        }
        else {

        }
        i++;
    }

    [self.delegate companySpecialities:self.selectedSpecialities];
    [self.specialitiesTableView reloadData];

1 回复 | 直到 9 年前

Bhumesh Purohit 9 年前

我在.h中声明了一个Mutable数组来存储数据

 NSMutableArray *selectedMarks;

在viewDidLoad中分配内存

selectedMarks = [NSMutableArray new];

在didSelectRowAtIndexPath中添加和删除对象

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   TableViewCell *cell = (TableViewCell *)[self.tblview cellForRowAtIndexPath:indexPath];


    NSString *strIndex=[NSString stringWithFormat:@"%ld",(long)indexPath.section];

    if ([selectedMarks containsObject:strIndex])// Is selected?
    {
        [selectedMarks removeObject:strIndex];
    }
    else{
        [selectedMarks addObject:strIndex];
        }
}

在单元格ForRowAtIndexPath中

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        static NSString *CRTableViewCellIdentifier = @"TableViewCell";
        TableViewCell *cell = (TableViewCell *)[self.tblview dequeueReusableCellWithIdentifier:CRTableViewCellIdentifier];
        if (cell == nil) {
            cell = [[TableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CRTableViewCellIdentifier];
        }
        cell.backgroundColor=[UIColor colorWithRed:122/255.0 green:196/255.0 blue:251/255.0 alpha:1];

        // Check if the cell is currently selected (marked)
           NSString *txtQRCodeid = [[[dictListQR objectForKey:@"boxlist"]objectAtIndex:indexPath.section]valueForKey:@"qr_code_id"];

NSString *text1 = [[[dictListQR objectForKey:@"boxlist"]objectAtIndex:indexPath.section]valueForKey:@"box_name"];
        NSString *text=[NSString stringWithFormat:@"QR Code %ld with %@",indexPath.section+1,text1];

         cell.isSelected = [selectedQR containsObject:txtQRCodeid] ? YES : NO;
        if (cell.isSelected) {
            [cell.btnSelection setImage:[UIImage imageNamed:@"check"] ];
            // set image of selected
        }
        else{
            [cell.btnSelection setImage:[UIImage imageNamed:@"uncheck"] ];
            // set unselected image
        }
     cell.lblQRcodeText.text=text;
   cell.textLabel.font = [UIFont fontWithName:@"Helvetica" size:15];
        return cell;
       }

这是我的工作