Question

在我的 iPhone UITable视图应用程序

中

当用户在桌面视图单元格/行上滑动时，我需要添加两个按钮。

一个撰写邮件按钮一个发送短信按钮给联系人。

我实现了以下代码，仅用于添加发送邮件（蓝云按钮）

//Add a left swipe gesture recognizer in view Did load
      UISwipeGestureRecognizer *recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self 
                                                                                       action:@selector(swipeRow:)];

      [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
      [contactsTable addGestureRecognizer:recognizer];
      [recognizer release];    





- (void)swipeRow:(UISwipeGestureRecognizer *)gestureRecognizer
{
      //Get location of the swipe
      CGPoint location = [gestureRecognizer locationInView:contactsTable];
      NSIndexPath *indexPath = [contactsTable indexPathForRowAtPoint:location];
       UITableViewCell *cell = [contactsTable cellForRowAtIndexPath:indexPath];


       UIButton *MailButton = [UIButton buttonWithType:UIButtonTypeCustom];
                  [MailButton setBackgroundImage:[UIImage imageNamed:@"sendData.png"]         forState:UIControlStateNormal];
                MailButton.frame=CGRectMake(150, 0, 40.0, 30.0);
         [MailButton addTarget:self action:@selector(SendMail)   forControlEvents:UIControlEventTouchUpInside];


      //Add mail button if index path is valid
      if(indexPath)
      {

            [cell addSubview:MailButton];

      }

}

当我们在单元格上滑动时，它会执行正常并向所选单元格/行添加按钮。

But when we swipe another cell the buttons on the previous cell are does not hide / removed重复如下

我想在其他单元格上显示（删除）按钮，同时在另一个单元格上轻扫一下只有一个云按钮一次..

Answer 1

为什么不将按钮保留在XIb中并将其添加到相应的单元格？它是整个类的单个对象，因此以前的单元格中没有按钮的重复。请试试。

Answer 2

您需要的是一个用于存储您添加云按钮的lastIndexPath的ivar。每次添加新按钮时，您必须从以前添加的indexPath中删除该按钮，并将新的indexPath分配给ivar。

您的代码可能看起来像这样（未经过测试）。

在属性上的.h文件中

@property (strong, nonatomic) NSIndexPath *lastIndexPath;

并在.m文件中合成它。

现在代码看起来像这样

UISwipeGestureRecognizer *recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self 
                                                                                       action:@selector(swipeRow:)];

      [recognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
      [contactsTable addGestureRecognizer:recognizer];
      [recognizer release];    





- (void)swipeRow:(UISwipeGestureRecognizer *)gestureRecognizer
{
      //Get location of the swipe
      CGPoint location = [gestureRecognizer locationInView:contactsTable];
      NSIndexPath *indexPath = [contactsTable indexPathForRowAtPoint:location];
      //New Code 
      UITableViewCell *cell = [contactsTable cellForRowAtIndexPath:indexPath];
      if(lastIndexPath != nil)
           UITableViewCell *last = [contactsTable cellForRowAtIndexPath:lastIndexPath];
      //End 
       UIButton *MailButton = [UIButton buttonWithType:UIButtonTypeCustom];
                  [MailButton setBackgroundImage:[UIImage imageNamed:@"sendData.png"]         forState:UIControlStateNormal];
                MailButton.frame=CGRectMake(150, 0, 40.0, 30.0);
         [MailButton addTarget:self action:@selector(SendMail)   forControlEvents:UIControlEventTouchUpInside];
MailButton.tag = 1111;// New code

      //Add mail button if index path is valid
      if(indexPath)
      {
            //New Code
            UIButton *mb = (UIButton *) [cell viewWithTag:1111];
            [mb removeFromSuperview];
            //End 
            [cell addSubview:MailButton];
            lastIndexPath = indexPath;// New Code
      }

}

如何在自定义滑动（而不是滑动以删除）单元格（轻扫到邮件/短信）时，在点击一个单元格时删除在其他TableView单元格中添加的子视图

2 个答案: