如何确定是否在自定义UITableViewCell上使用了UIButton？

Question

以下实现正常，但它不是最优雅的解决方案。 是否有任何最佳实践或不同的实现来确定是否在自定义UITableViewCell上使用UIButton？

- (IBAction)customCellButtonTapped:(id)sender {
    UIButton *button = (UIButton *)sender;
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:button.tag inSection:0];
    NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext];
    NSManagedObject *object = [self.fetchedResultsController objectAtIndexPath:indexPath];
    // Set the value of the object and save the context
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    TTCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    [self configureCell:cell atIndexPath:indexPath];
    [cell.customCellButton addTarget:self action:@selector(customCellButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
    [cell.customCellButton setTag:indexPath.row];
    return cell;
}

Answer 1

我同意它不够优雅。由于要重复使用单元格，因此必须更改按钮标记以保持同步。更不用说，标签可能是真正需要的，这不是告诉代码视图的行。

这是我在tableviews中一直使用的包含控件的方法：

- (NSIndexPath *)indexPathOfSubview:(UIView *)view {

    while (view && ![view isKindOfClass:[UITableViewCell self]]) {
        view = view.superview;
    }
    UITableViewCell *cell = (UITableViewCell *)view;
    return [self.tableView indexPathForCell:cell];
}

现在，在

- (IBAction)customCellButtonTapped:(id)sender {

    NSIndexPath *indexPath = [self indexPathOfSubview:sender];
    // use this to access your MOC

   // or if we need the model item...
   id myModelItem = self.myModelArray[indexPath.row];

   // or if we need the cell
   UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];

Answer 2

如果您已经拥有该单元的子类，则可以始终实现所有者实现的协议，例如：

自定义单元格

@protocol TTCustomCellDelegate <NSObject>
    - (void)customCellWasTapped:(TTCustomCell *)cell withSomeParameter:(id)parameter;
@end

@interface TTCustomCell : UITableViewCell
@property (nonatomic, weak) id<TTCustomCellDelegate> delegate;
@end

@implementation
- (void)buttonWasTapped
{
    if(self.delegate) 
        [self.delegate customCellWasTapped:self withSomeParameter:whateverYouNeed];
}

的ViewController

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    ...
    cell.delegate = self;
    ...
}

- (void)customCellWasTapped:(TTCustomCell *)cell withSomeParameter:(id)parameter
{
    id thing = cell.somePropertyUniqueToThisCell;
    id otherThing = parameter;
}