添加手勢識別器以指定表格中的單元格對象

Question

我試圖在所有單元格的uiimageview中添加一個手勢識別器，這將使uiimageview在該索引路徑上更改圖像，但是我不知道如何告訴手勢ibaction來更改該索引路徑中的圖像。

我用這段代碼實現的是，它只能在最后一個單元格中正常工作，所有其他單元格也無法獲得手勢。

我的代碼：

- (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，如果以前已經問過這個問題:)但我搜索了一個小時，但找不到合適的一個。

*編輯：在此代碼中，每個單元格都獲得了敲擊識別器，但未觸發

- (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：我終於找到了解決方法，下面的代碼是正確的，但是需要告訴手勢觸發動作！

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

Answer 1

您應該從手勢中獲取圖像視圖。 無需為imgConfirm使用實例變量。 您還需要為每個圖像視圖創建一個單獨的手勢識別器。 您不能一遍又一遍地重復使用同一個。

- (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"]];
    }
}

這里缺少的一個重要方面是，如果用戶滾動表，圖像將被重置。 您需要添加更多代碼來跟蹤每個圖像的當前狀態，以便您的cellForRowAtIndexPath:設置正確的圖像。