添加手势识别器以指定表格中的单元格对象

Question

我试图在所有单元格的uiimageview中添加一个手势识别器，这将使uiimageview在该索引路径上更改图像，但是我不知道如何告诉手势ibaction来更改该索引路径中的图像。

我用这段代码实现的是，它只能在最后一个单元格中正常工作，所有其他单元格也无法获得手势。

我的代码：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    // Configure the cell...
    imgConfirm = (UIImageView *)[cell viewWithTag:107];
    [imgConfirm setImage:[UIImage imageNamed:@"icon2"]];
    [imgConfirm addGestureRecognizer:self.tapGestureM2];
    return cell;
}

- (IBAction)tapGestureTap:(UITapGestureRecognizer *)sender {
    NSData* imgConfirmData1 = UIImagePNGRepresentation(imgConfirm.image);
    NSData* imgConfirmData2 = UIImagePNGRepresentation([UIImage imageNamed:@"icon2"]);

    if ([imgConfirmData1 isEqualToData:imgConfirmData2]) {
        [imgConfirm setImage:[UIImage imageNamed:@"icon"]];
    }
    else{
        [imgConfirm setImage:[UIImage imageNamed:@"icon2"]];
    }
}

我很抱歉，如果以前已经问过这个问题:)但我搜索了一个小时，但找不到合适的一个。

*编辑：在此代码中，每个单元格都获得了敲击识别器，但未触发

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
indexpath=[self.tableViewM2 indexPathForCell:cell];
// Configure the cell...
UIImageView *imgConfirm = (UIImageView *)[cell viewWithTag:107];
[imgConfirm setImage:[UIImage imageNamed:@"icon2"]];

UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc] init];
// setup gesture as needed
[imgConfirm addGestureRecognizer:gesture];
return cell;
}

- (IBAction)tapGestureTap:(UITapGestureRecognizer *)sender {
NSLog(@"%d,%d",indexpath.row,indexpath.section);
UIImageView *imgConfirm = (UIImageView *)sender.view;
NSData* imgConfirmData1 = UIImagePNGRepresentation(imgConfirm.image);
NSData* imgConfirmData2 = UIImagePNGRepresentation([UIImage imageNamed:@"icon2"]);

if ([imgConfirmData1 isEqualToData:imgConfirmData2]) {
    [imgConfirm setImage:[UIImage imageNamed:@"icon"]];
}
else{
    [imgConfirm setImage:[UIImage imageNamed:@"icon2"]];
}
}

* Edit2：我终于找到了解决方法，下面的代码是正确的，但是需要告诉手势触发动作！

UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureTap:)];

Answer 1

您应该从手势中获取图像视图。 无需为imgConfirm使用实例变量。 您还需要为每个图像视图创建一个单独的手势识别器。 您不能一遍又一遍地重复使用同一个。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    // Configure the cell...
    UIImageView *imgConfirm = (UIImageView *)[cell viewWithTag:107];
    [imgConfirm setImage:[UIImage imageNamed:@"icon2"]];
    UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc] inittWithTarget:self action:@selector(tapGestureTap:)];
    // setup gesture as needed
    [imgConfirm addGestureRecognizer:gesture];
    return cell;
}

- (IBAction)tapGestureTap:(UITapGestureRecognizer *)sender {
    UIImageView *imgConfirm = (UIImageView *)sender.view;
    NSData* imgConfirmData1 = UIImagePNGRepresentation(imgConfirm.image);
    NSData* imgConfirmData2 = UIImagePNGRepresentation([UIImage imageNamed:@"icon2"]);

    if ([imgConfirmData1 isEqualToData:imgConfirmData2]) {
        [imgConfirm setImage:[UIImage imageNamed:@"icon"]];
    }
    else{
        [imgConfirm setImage:[UIImage imageNamed:@"icon2"]];
    }
}

这里缺少的一个重要方面是，如果用户滚动表，图像将被重置。 您需要添加更多代码来跟踪每个图像的当前状态，以便您的cellForRowAtIndexPath:设置正确的图像。