如何创建一个充满 UITableViewCells 的 UITableView，每个都有一个 UISwitch？

Question

我正在制作电话簿。

我正在尝试创建一个 UITableView，其中包含一个原型单元格，其中包含一个 UISwitch，它描述了特定联系人是公开的还是私有的。

如何创建这样的 UISwitch 即使在滚动期间也能保持其切换状态？ dequeueReusableCellWithIdentifier 给我带来了很多问题，因为它没有保存 UISwitches 的切换状态。

虽然我喜欢节省内存，但切换 cellForRowAtIndexPath 中的开关（根据联系人的隐私布尔值）无法始终显示联系人的公共/私人状态。

请参阅下面我正在尝试构建的屏幕截图：

编辑：这是我的 cellForRowAtIndexPath：

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

    AHBContact *thisContact = nil;

    AHBBrowseContactCell *cell  =[tableView dequeueReusableCellWithIdentifier:@"BROWSECELL"];

    // from  contacts list
    thisContact = [self.contacts[indexPath.section] allValues][0][indexPath.row];

    cell.customPublicSwitch.onTintColor = [AHBUtilities greenColor];
    cell.customPublicSwitch.onText= @"Public";
    cell.customPublicSwitch.offText=@"Private";

    if(thisContact.privacy){
        NSLog(@"public %@",thisContact.fullName);
       cell.customPublicSwitch.on = YES;

    }
    else{
        NSLog(@"private %@", thisContact.fullName);

       cell.customPublicSwitch.on = NO;

    }

    cell.labelName.text = thisContact.fullName;
    cell.labelName.font = [AHBUtilities regularFontWithSize:cell.labelName.font.pointSize];
    cell.imageViewIcon.image = [AHBIcons phoneIconForCategory:thisContact.category];

    cell.textLabel.backgroundColor = [UIColor clearColor];
    cell.backgroundColor = [UIColor colorWithWhite:1 alpha:0.55];

    return cell;
}

第二次编辑：这是我在开关的“valueChanged”上运行的“togglePublic”方法

    -(IBAction)togglePublic:(UIControl *)button withEvent:(UIEvent *)event {

        DCRoundSwitch *switch1 = (DCRoundSwitch *)button;
        UITableViewCell *cell = (UITableViewCell *)switch1.superview;
        NSIndexPath *indexPath = [self.tableview indexPathForCell: cell.superview];

        if ( indexPath == nil ){

            return;

        }

        AHBContact *contact = [self.contacts[indexPath.section] allValues][0][indexPath.row];

        contact.privacy = !contact.privacy;

        NSLog(@"Public switch toggled for: %@", contact.firstName);

        [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];

[[AHBContactsController sharedController] updateContact:contact completion:^(id result) {

        [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];


           NSLog (@"Public/Private updated%@",result);


       } failure:^(NSError *error) {

           [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];

           UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Sync Problem"
                                                             message:@"Could save changes. Please try again."
                                                            delegate:self
                                                   cancelButtonTitle:@"Ok"
                                                   otherButtonTitles:nil];
           [message show];



       }];

    }

Answer 1

尝试在委托方法中设置

- (void)tableView:(UITableView *)tableView willDsiplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
    UISwitch *switch = cell.yourCellSwitch;
    switch.on = yourSwitchVariable;
}

Answer 2

也许您在 cellForRowAtIndexPath: 中创建的开关是问题所在。尝试这样做。使用 UILabel 和 UISwitch 创建自定义单元格。制作这些 IBOutlets 和自定义单元格的属性并将它们连接起来。现在在 cellForRowAtIndexPath: 方法中使用自定义单元格而不是默认单元格。由于单元格正在被重用，并且每次当单元格在屏幕上可见时都会调用此方法，我猜在您每次创建 UISwitch 然后分配其状态时会发生不一致

    static NSString *cellIdentifier = @"CellIdentifier";

        YourCustomCell *cell = (YourCustomCell*)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
        if (!cell)
        {
            NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"YourCustomCell" owner:self options:nil];
            for (id currentObject in topLevelObjects){
                if ([currentObject isKindOfClass:[UITableViewCell class]]){
                    cell =  (YourCustomCell *) currentObject;
                    break;
                }
            }
        }

       // from  contacts list
            thisContact = [self.contacts[indexPath.section] allValues][0][indexPath.row];
    if(thisContact.privacy){
            NSLog(@"public %@",thisContact.fullName);
           cell.customPublicSwitch.on = YES;

        }
        else{
            NSLog(@"private %@", thisContact.fullName);

           cell.customPublicSwitch.on = NO;

        }

        cell.labelName.text = thisContact.fullName;
        cell.labelName.font = [AHBUtilities regularFontWithSize:cell.labelName.font.pointSize];
        cell.imageViewIcon.image = [AHBIcons phoneIconForCategory:thisContact.category];
        cell.textLabel.backgroundColor = [UIColor clearColor];
        cell.backgroundColor = [UIColor colorWithWhite:1 alpha:0.55];
     return cell;
}

希望这会有所帮助:)