Ios UITableViewCell和UISwitch赢得'；你不重画吗？

我有一个uitableviewcell，其中包含一个uiswitch（obj-c）。该开关工作正常，但当单击tableview外的按钮时，我需要单元格中的uiswitch重新绘制并将其禁用。我正在尝试以下方法，但不起作用？调用了我的CellForRowatinex，调用了我的代码块，上面写着禁用UISwitch，但什么也没发生

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        thingic NSString *cellIdentifier = @"Cell";

        NSString *danID = [[NSUserDefaults standardUserDefaults]objectForKey:kSavingdanID];


        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        if (cell == nil) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellSelectionStyleNone reuseIdentifier:cellIdentifier];
            cell.backgroundColor = [UIColor clearColor];
            cell.textLabel.font = [UIFont fontWithName:@"HelveticaNeue" size:21];
            cell.textLabel.textColor = [UIColor whiteColor];
            cell.textLabel.highlightedTextColor = [UIColor lightGrayColor];
            cell.selectedBackgroundView = [[UIView alloc] init];
        }


        if(indexPath.row == 0) { // Mute thing Calls

            cell.textLabel.text = @"Public Calls";
            self.thingSwitchView = [[UISwitch alloc] initWithFrame:CGRectMake(170, 13, 0, 0)];
            [cell.contentView addSubview:self.thingSwitchView];
    //        cell.accessoryView = switchView;
            [self.thingSwitchView setOn:YES animated:NO];
            [self.thingSwitchView addTarget:self action:@selector(thingSwitchChanged:) forControlEvents:UIControlEventValueChanged];
            cell.backgroundColor = [UIColor clearColor];
            cell.contentView.backgroundColor = [UIColor colorWithRed: 0.0/255.0 green: 0.0/255.0 blue: 0.0/255.0 alpha: 0.4];

        } else if(indexPath.row == 1) { // Mute boo Calls

            cell.textLabel.text = @"boo Calls";
            self.booSwitchView = [[UISwitch alloc] initWithFrame:CGRectMake(170, 12, 0, 0)];
            [cell.contentView addSubview:self.booSwitchView];
    //        cell.accessoryView = switchView;
            [self.booSwitchView setOn:YES animated:NO];
            [self.booSwitchView addTarget:self action:@selector(booSwitchChanged:) forControlEvents:UIControlEventValueChanged];
            cell.backgroundColor = [UIColor clearColor];
            cell.contentView.backgroundColor = [UIColor colorWithRed: 0.0/255.0 green: 0.0/255.0 blue: 0.0/255.0 alpha: 0.4];

        } else {
            // do nothing
        }


        if([NSString isEmpty:danID]){
            [self.thingSwitchView setEnabled:NO];
            [self.booSwitchView setEnabled:NO];
            [cell.backgroundView setNeedsDisplay];
            [cell setNeedsDisplay];
        }

        return cell;
    }

---

通过对UITableViewCell进行子类化并使用委托，我成功地实现了开关单元

@class EGSwitchCell;

@protocol EGSwitchCellDelegate <NSObject>

-(void)switchCellDidChange:(EGSwitchCell *)switchCell;

@end

@interface EGSwitchCell : UITableViewCell

@property (nonatomic, weak) IBOutlet UISwitch *mySwitch;
@property (weak, nonatomic) IBOutlet UILabel *labelTitle;

@property (nonatomic, weak) id<EGSwitchCellDelegate> delegate;

-(IBAction)switchChanged:(id)sender;

@end

@class-EGSwitchCell；
@协议代理
-（void）switchCellDidChange：（EGSwitchCell*）switchCell；
@结束
@接口EGSwitchCell:UITableViewCell
@属性（非原子，弱）IBUISwitch*mySwitch；
@属性（弱，非原子）IBUILabel*标签；
@属性（非原子，弱）id委托；
-（iAction）开关已更改：（id）发送方；
@结束

---

希望它能给你一些指导。

首先，在每次调用

cellForRowAtIndexPath:

的过程中，添加新的开关作为子视图，你在旧开关的基础上堆积新开关。我建议您在创建开关时将其添加到相应的单元格中。同样，我还建议您在创建单元格时设置单元格的contentView.backgroundColor，因为它不会更改

这花了我一点时间，但我想我明白了为什么你要用开关类变量。。。我假设您的表（？）中只有一个部分，因此这些开关每次只出现一次。如果是这样的话，我们可以利用这些类变量，因为即使开关改变，它们也可以维护它们的变量

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    thingic NSString *cellIdentifier = @"Cell";

    NSString *danID = [[NSUserDefaults standardUserDefaults]objectForKey:kSavingdanID];

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellSelectionStyleNone reuseIdentifier:cellIdentifier];
        cell.backgroundColor = [UIColor clearColor];
        cell.textLabel.font = [UIFont fontWithName:@"HelveticaNeue" size:21];
        cell.textLabel.textColor = [UIColor whiteColor];
        cell.textLabel.highlightedTextColor = [UIColor lightGrayColor];
        cell.selectedBackgroundView = [[UIView alloc] init];

        if (indexPath.row == 0) {
            self.thingSwitchView = [[UISwitch alloc] initWithFrame:CGRectMake(170, 13, 0, 0)];
            [self.thingSwitchView setOn:YES animated:NO];
            [self.thingSwitchView addTarget:self action:@selector(thingSwitchChanged:) forControlEvents:UIControlEventValueChanged];
            [cell.contentView addSubview:self.thingSwitchView];

            cell.contentView.backgroundColor = [UIColor colorWithRed: 0.0/255.0 green: 0.0/255.0 blue: 0.0/255.0 alpha: 0.4];

        } else if (indexPath.row == 1) {
            self.booSwitchView = [[UISwitch alloc] initWithFrame:CGRectMake(170, 12, 0, 0)];
            [self.booSwitchView setOn:YES animated:NO];
            [self.booSwitchView addTarget:self action:@selector(booSwitchChanged:) forControlEvents:UIControlEventValueChanged];
            [cell.contentView addSubview:self.booSwitchView];

            cell.contentView.backgroundColor = [UIColor colorWithRed: 0.0/255.0 green: 0.0/255.0 blue: 0.0/255.0 alpha: 0.4];
        }
    }

    if (indexPath.row == 0) { // Mute thing Calls

        cell.textLabel.text = @"Public Calls";

    } else if (indexPath.row == 1) { // Mute boo Calls

        cell.textLabel.text = @"boo Calls";
    }

    if ([NSString isEmpty:danID]) {
        [self.thingSwitchView setEnabled:NO];
        [self.booSwitchView setEnabled:NO];
    } else {
        [self.thingSwitchView setEnabled:YES];
        [self.booSwitchView setEnabled:YES];
    }

    return cell;
}

---

另外，请确保您正在按预期更改

NSUserDefaults

objectForKey

kSavingdanID

。如果您仍然存在问题，我建议从

thingSwitchChanged:

和

booSwitchChanged:

发布您的代码。

您不能以当前方式执行此操作。你不能用self在细胞内获得开关。

Self.thingSwitchView

和

Self.booSwitchView

包含最后分配的交换机。这不是牢房里的开关。此外，即使单元被重用，您每次都会创建一个新的交换机。这也不是一个好的做法

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  thingic NSString *cellIdentifier = @"Cell";
  NSString *danID = [[NSUserDefaults standardUserDefaults]objectForKey:kSavingdanID];


  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
  cell.selectionStyle   = UITableViewCellSelectionStyleNone;
  if (cell == nil)
  {
      cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellSelectionStyleNone reuseIdentifier:cellIdentifier];
      cell.backgroundColor = [UIColor clearColor];
      cell.textLabel.font = [UIFont fontWithName:@"HelveticaNeue" size:21];
      cell.textLabel.textColor = [UIColor whiteColor];
      cell.textLabel.highlightedTextColor = [UIColor lightGrayColor];
      cell.selectedBackgroundView = [[UIView alloc] init];
  }

  if(indexPath.row == 0 && ![cell.contentView viewWithTag:101])
  { // Mute thing Calls
       cell.textLabel.text = @"Public Calls";
       self.thingSwitchView = [[UISwitch alloc] initWithFrame:CGRectMake(170, 13, 0, 0)];
       self.thingSwitchView.tag = 101;
       [cell.contentView addSubview:self.thingSwitchView];
       [self.thingSwitchView setOn:YES animated:NO];
       [self.thingSwitchView addTarget:self action:@selector(thingSwitchChanged:) forControlEvents:UIControlEventValueChanged];
       cell.backgroundColor = [UIColor clearColor];
       cell.contentView.backgroundColor = [UIColor colorWithRed: 0.0/255.0 green: 0.0/255.0 blue: 0.0/255.0 alpha: 0.4];
  }
  else if(indexPath.row == 1 && ![cell.contentView viewWithTag:102])
  { // Mute boo Calls
       cell.textLabel.text = @"boo Calls";
       self.booSwitchView = [[UISwitch alloc] initWithFrame:CGRectMake(170, 12, 0, 0)];
       [cell.contentView addSubview:self.booSwitchView];
       self.booSwitchView.tag = 102;
       [self.booSwitchView setOn:YES animated:NO];
       [self.booSwitchView addTarget:self action:@selector(booSwitchChanged:) forControlEvents:UIControlEventValueChanged];
       cell.backgroundColor = [UIColor clearColor];
       cell.contentView.backgroundColor = [UIColor colorWithRed: 0.0/255.0 green: 0.0/255.0 blue: 0.0/255.0 alpha: 0.4];
   }

   UISwitch *thingSwitch = [cell.contentView viewWithTag:101];
   UISwitch *booSwitch   = [cell.contentView viewWithTag:102];
   if([NSString isEmpty:danID])
   {
        [thingSwitch setEnabled:NO];
        [booSwitch setEnabled:NO];
   }
   else
   {
      [thingSwitch setEnabled:YES];
      [booSwitch setEnabled:YES];
   }
   return cell;
}

---

不要介意那些其他的评论（已删除）。。。我看到了将开关添加为子视图的位置。但是你应该（1）重用这些开关，（2）在本地声明它们。在什么情况下你想关闭开关？您还没有在

cellforrowatinexpath

中说明这一点。我正准备写一个答案，但有太多的未知数。你需要发布更多的代码。特别是从thingSwitchChanged开始：但是像您那样内联操作如何在其他代码中访问交换机，因为我不再有引用？@jdog:为什么您要用其他方法访问它，您如何访问它？