iphone - 如何将复选框添加到 UITableViewCell？

Question

前段时间有人问过这个问题并给出了一些答案，但我并不真正理解其中的任何一个。所以我想知道是否有人可以写一个易于理解的教程来说明如何执行下图所示的操作:

http://img208.yfrog.com/img208/6119/screenshotkmr.png

如果有人能确切地分享如何做到这一点，我将非常感激，因为它看起来真的很酷，我很乐意在我的应用程序中使用类似的东西:-)!

Answer 1

制作未勾选和勾选图像..

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

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
    }

    if ([selectedRowsArray containsObject:[contentArray objectAtIndex:indexPath.row]]) {
        cell.imageView.image = [UIImage imageNamed:@"checked.png"];
    }
    else {
       cell.imageView.image = [UIImage imageNamed:@"unchecked.png"];
    }
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleChecking:)];
    [cell.imageView addGestureRecognizer:tap];
    cell.imageView.userInteractionEnabled = YES; //added based on @John 's comment
    //[tap release];

    cell.textLabel.text = [contentArray objectAtIndex:indexPath.row];
    return cell;
}

- (void) handleChecking:(UITapGestureRecognizer *)tapRecognizer {
    CGPoint tapLocation = [tapRecognizer locationInView:self.tableView];
    NSIndexPath *tappedIndexPath = [self.tableView indexPathForRowAtPoint:tapLocation];

    if ([selectedRowsArray containsObject:[contentArray objectAtIndex:tappedIndexPath.row]]) {
        [selectedRowsArray removeObject:[contentArray objectAtIndex:tappedIndexPath.row]];
    }
    else {
        [selectedRowsArray addObject:[contentArray objectAtIndex:tappedIndexPath.row]];
    }
    [self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:tappedIndexPath] withRowAnimation: UITableViewRowAnimationFade];
}