Question

我已经将一个switchview作为附件视图添加到UItableviewcell，我在表中有5个条目，即，5个单元格和那个行中的开关..我给每个开关一个标签值，它等于indexpath .row（所以第一个开关为0，第二个为1 ......第五个开关为4）

UISwitch *switchView = [[UISwitch alloc]initWithFrame:CGRectZero];
cell.accessoryView = switchView;
[switchView setOn:NO animated:NO];
[switchView setTag:indexPath.row];

我已经给出了切换的目标方法，当切换的值改变时，会调用目标方法。

[switchView addTarget:self action:@selector(switchTimer:)   forControlEvents:UIControlEventValueChanged];

在这个基于Switch I事件发生变化的目标方法中，尝试构建一个计数等于交换机数量的数组。例如：如果开关0和3为ON且开关1,2,4为OFF，则阵列看起来像这样

A = {"ON","OFF","OFF","ON","OFF"}

以下是我用来实现此目的的方法：

-(void)switchTimer:(UISwitch *)senderSwitch{
       NSLog(@"Sender Switch Tag is %d",senderSwitch.tag);

       for(int i=0;i<[array_Timers count];i++){//Start for loop

         senderSwitch.tag = i;

         if(senderSwitch.on){
               NSLog(@"%@ is ON",[array_Timers objectAtIndex:i]);
               //Here I add an object to the array with value "ON"

         }
         else{
               NSLog(@"%@ is OFF",[array_Timers objectAtIndex:i]);
              //Here I add an object to the array with value "OFF"
         }

     }//End for loop
}

问题是每次开关都开启，比如开关2（标签1）所有开关都会得到标签值1，即使我借助他们的标签值迭代所有开关。我想知道所有开关的状态，即使只有1个开关的值发生变化..但是没有发生，所有开关都得到标签值1，我得到一个这样的数组

A = {"ON","ON","ON","ON","ON"}//when switch 2 is ON

A = {"OFF","OFF","OFF","OFF","OFF"}//when switch 2 is OFF

有人可以帮我找出问题所在吗？提前致谢

编辑：完整的cellForRowAtIndexPath

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

    static NSString *CellIdentifier = @"Cell";
    UITableViewCell  *cell = [timersTableView dequeueReusableCellWithIdentifier:CellIdentifier];
    cell.selectionStyle = UITableViewCellSelectionStyleGray;


if (cell == nil)
{
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    cell.accessoryType=UITableViewCellAccessoryNone;

    UISwitch *switchView = [[UISwitch alloc]initWithFrame:CGRectZero];
    cell.accessoryView = switchView;
    [switchView setOn:NO animated:NO];
    [switchView setTag:indexPath.row];
    [switchView addTarget:self action:@selector(switchTimer:) forControlEvents:UIControlEventValueChanged];
    [switchView release];


    UIView *v = [[[UIView alloc] init] autorelease];
    v.backgroundColor = [UIColor orangeColor];
    cell.selectedBackgroundView = v;

}
UserTimer *usertimer = [array_Timers objectAtIndex:indexPath.row];//irrelevant here
[cell.textLabel setText:usertimer.alias];


return cell;

}

Answer 1

如果你想知道所有开关的状态，即使只有1个开关的值被改变，试试这个，

-(void)switchTimer:(UISwitch *)senderSwitch{
       NSLog(@"Sender Switch Tag is %d",senderSwitch.tag);

       for(int i=0;i<[array_Timers count];i++){//Start for loop
         NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
         UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
         UISwitch *switch = (UISwitch *)[cell.contentView viewWithTag:indexPath.row];

         if(switch.on){
               NSLog(@"%@ is ON",[array_Timers objectAtIndex:i]);
               //Here I add an object to the array with value "ON"

         }
         else{
               NSLog(@"%@ is OFF",[array_Timers objectAtIndex:i]);
              //Here I add an object to the array with value "OFF"
         }

     }//End for loop
}

Answer 2

当您使用for循环时，开关的值会发生变化。所以你不需要在这里使用for循环。相反，你只需要替换当前开关索引处的对象。

-(void)switchTimer:(UISwitch *)senderSwitch {
    NSString *currentValue = @"";
    NSInteger index = senderSwitch.tag;
    if(senderSwitch.on){
        currentValue = @"ON";
    }
    else {
        currentValue = @"OFF";
    }

    [array_Timers replaceObjectAtIndex: index withObject: currentValue];
}

Answer 3

您需要做的是：在加载表之前，主要使用值为OFF初始化Array。对于Ex：

-(Void) ViewDidLoad {
   array_Timers = [NSArray alloc]... // Add the Objects .
}

在UITableView委托：（不要尝试将Tag设置为0到任何元素）

UISwitch *switchView = [[UISwitch alloc]initWithFrame:CGRectZero];
cell.accessoryView = switchView;
[switchView setOn:NO animated:NO];
[switchView setTag:indexPath.row+25]; //don't try to set Tag as 0 to any elements 
[switchView addTarget:self action:@selector(switchTimer:)   forControlEvents:UIControlEventValueChanged];

然后根据事件

替换值

-(void)switchTimer:(UISwitch *)senderSwitch{
      [array_Timers replaceObjectAtIndex:0 withObject:[[NSNumber numberWithBool:senderSwitch - 25]];

NSLog (@" Values %@", array_Timers );
}

Answer 4

试试这个......

-(void)switchTimer:(UISwitch *)senderSwitch{
   NSLog(@"Sender Switch Tag is %d",senderSwitch.tag);

   for (UISwitch *mySwitch in switchesArray) {

     if(mySwitch.on){
           NSLog(@"%@ is ON",mySwitch);
           //Here I add an object to the array with value "ON"

     }
     else{
           NSLog(@"%@ is OFF",mySwitch);
          //Here I add an object to the array with value "OFF"
     }

 }//End for loop

注意 - 如果您重复使用开关并且array_Timers中的顺序与表格视图中的顺序不一致，则应首先按标记对开关进行排序。

在UITableView中为每个UITableViewcell切换

4 个答案: