如何向UITableViewCell添加复选框？ [英] How to add checkboxes to UITableViewCell??

问题描述

前一段时间有人已经问了这个问题并给出了一些答案，但我并没有真正了解它们。所以我想知道是否有人可以写一个易于理解的教程，如何处理下图所示的事情：

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

如果有人能分享到这个怎么样，我会非常感激，因为它看起来非常酷，我很乐意在我的申请中使用类似的东西： - ）！

解决方案

制作未经检查并勾选的图片..

   - （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; //基于@John的评论添加
 // [tap release]; 
 
 cell.textLabel.text = [contentArray objectAtIndex：indexPath.row]; 
返回单元格; 
} 
 
  - （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]; 
} 
  

some time ago someone already asked this question and a few answers were given but i didn't really understand any of them. So i was wondering if anyone could please write an easy to understand tutorial on how to do the things shown on the image below:

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

I would be so greatful if anyone can share exactly how to this because it looks really cool and i would love to use something similar in my application :-)!

解决方案

Make a unchecked and checked image..

- (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];
}

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