没有获取IndexPath在UITableViewCell中点击UISwitch

Question

我在UITableViewCell中添加了UISwitch，表格内容是动态的，这意味着在tableview中可能有很多UISwitch，我需要为每个UITableViewCell获取UISwitch状态，但没有得到accessoryButtonTappedForRowWithIndexPath方法中的indexPath。

我的代码是：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    LocationCell *cell = (LocationCell *)[tableView 
              dequeueReusableCellWithIdentifier:@"LocationCell"]; 

    UISwitch *useLocationSwitch = [[UISwitch alloc] initWithFrame:CGRectZero]; 
    [cell addSubview:useLocationSwitch]; 
    cell.accessoryView = useLocationSwitch; 

    [useLocationSwitch addTarget: self 
       action: @selector(accessoryButtonTapped:withEvent:) 
    forControlEvents: UIControlEventTouchUpInside]; 

    return cell; 
} 

- (void) accessoryButtonTapped: (UIControl *) button withEvent: (UIEvent *) event 
{ 
    NSIndexPath * indexPath = [showLocationTableView indexPathForRowAtPoint: [[[event touchesForView: button] anyObject] locationInView: showLocationTableView]]; 
    if (indexPath == nil) 
     return; 

    [showLocationTableView.delegate tableView: showLocationTableView accessoryButtonTappedForRowWithIndexPath: indexPath]; 
} 

-(void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath{ 
    NSLog(@"index path: %@", indexPath.row); 
} 

Answer 1

控制事件应该是UIControlEventValueChanged。

不是UIControlEventTouchUpInside。改变它，然后再试一次。

所以动作设置语句应该如下：

[useLocationSwitch addTarget: self 
         action: @selector(accessoryButtonTapped:withEvent:) 
      forControlEvents: UIControlEventValueChanged]; 

编辑：

- (void) accessoryButtonTapped: (UIControl *) button withEvent: (UIEvent *) event 
{ 
    UISwitch *switch1 = (UISwitch *)button; 
    UITableViewCell *cell = (UITableViewCell *)switch1.superview; 
    NSIndexPath *indexPath = [self.tableView indexPathForCell:cell]; 

    //NSIndexPath * indexPath = [showLocationTableView indexPathForRowAtPoint: [[[event touchesForView: button] anyObject] locationInView: showLocationTableView]]; 
    if (indexPath == nil) 
     return; 

    [showLocationTableView.delegate tableView: showLocationTableView accessoryButtonTappedForRowWithIndexPath: indexPath]; 
}