UITableView以编程方式调用滑动操作

Question

我有一个UITableView，用户可以向左滑动以显示操作（如iOS 8邮件）。这一切都按预期工作。我想在用户点击单元格的某个部分时触发此操作。我如何以编程方式调用此幻灯片操作？

当前行为：用户必须向左滑动显示操作按钮。

期望的行为：用户在单元格上点击（一个动作按钮）。单元格滑过以揭示动作按钮。

Answer 1

嗯，我无法找到一种方法来做到这一点编程，但我想出了这个解决方法。当用户点击单元格时，我将其动画（平移）到左侧以便瞬间显示一个“点击我”按钮。这很快就会逆转，因此细胞恢复正常。这提供了一个视觉提示，让用户知道他们可以刷单元格：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{ 
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath]; 

    __block UILabel *swipeLabel = [[UILabel alloc]initWithFrame:CGRectMake(cell.bounds.size.width, 
                    0, 
                    200, 
                    cell.bounds.size.height)]; 

    swipeLabel.text = @" Swipe Me"; 
    swipeLabel.backgroundColor = [UIColor greenColor]; 
    swipeLabel.textColor = [UIColor whiteColor]; 
    [cell addSubview:swipeLabel]; 

    [UIView animateWithDuration:0.3 animations:^{ 
     [cell setFrame:CGRectMake(cell.frame.origin.x - 100, cell.frame.origin.y, cell.bounds.size.width, cell.bounds.size.height)]; 
    } completion:^(BOOL finished) { 
     [UIView animateWithDuration:0.3 animations:^{ 
      [cell setFrame:CGRectMake(cell.frame.origin.x + 100, cell.frame.origin.y, cell.bounds.size.width, cell.bounds.size.height)]; 
     } completion:^(BOOL finished) { 
      [swipeLabel removeFromSuperview]; 
      swipeLabel = nil; 
     }]; 
    }]; 
} 

希望这可以帮助别人。

请注意，您需要将您的tableViewCell的选择类型设置为none。否则灰色条会掩盖它。

更新。我想我会发布一个更SWIFTY版本：在搜索Swift版本VaporwareWolf的回答

func previewActions(forCellAt indexPath: IndexPath) { 
    guard let cell = tableView.cellForRow(at: indexPath) else { 
     return 
    } 

    let label: UILabel = { 
     let label = UILabel(frame: CGRect.zero) 
     label.text = " Swipe Me " 
     label.backgroundColor = .blue 
     label.textColor = .white 
     return label 
    }() 

    // Figure out the best width and update label.frame 
    let bestSize = label.sizeThatFits(label.frame.size) 
    label.frame = CGRect(x: cell.bounds.width - bestSize.width, y: 0, width: bestSize.width, height: cell.bounds.height) 
    cell.insertSubview(label, belowSubview: cell.contentView) 

    UIView.animate(withDuration: 0.3, animations: { 
     cell.transform = CGAffineTransform.identity.translatedBy(x: -label.bounds.width, y: 0) 
     label.transform = CGAffineTransform.identity.translatedBy(x: label.bounds.width, y: 0) 
    }) { (finished) in 
     UIView.animateKeyframes(withDuration: 0.3, delay: 0.25, options: [], animations: { 
      cell.transform = CGAffineTransform.identity 
      label.transform = CGAffineTransform.identity 
     }, completion: { (finished) in 
      label.removeFromSuperview() 
     }) 
    } 
} 

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 
    previewActions(forCellAt: indexPath) 
    return 
} 

Answer 2

对任何人来说，那就是：

func animateRevealHideActionForRow(tableView: UITableView, indexPath: NSIndexPath) { 
    let cell = tableView.cellForRowAtIndexPath(indexPath); 

    // Should be used in a block 
    var swipeLabel: UILabel? = UILabel.init(frame: CGRectMake(cell!.bounds.size.width, 
     0, 
     200, 
     cell!.bounds.size.height)) 

    swipeLabel!.text = " Swipe Me"; 
    swipeLabel!.backgroundColor = UIColor.init(red: 255/255, green: 41/255, blue: 53/255, alpha: 1) // Red 
    swipeLabel!.textColor = UIColor.whiteColor() 
    cell!.addSubview(swipeLabel!) 

    UIView.animateWithDuration(0.3, animations: { 

     cell!.frame = CGRectMake(cell!.frame.origin.x - 100, cell!.frame.origin.y, cell!.bounds.size.width + 100, cell!.bounds.size.height) 

    }) { (finished) in 
     UIView.animateWithDuration(0.3, animations: { 

      cell!.frame = CGRectMake(cell!.frame.origin.x + 100, cell!.frame.origin.y, cell!.bounds.size.width - 100, cell!.bounds.size.height) 

      }, completion: { (finished) in 
       swipeLabel?.removeFromSuperview() 
       swipeLabel = nil; 
     }) 

    } 
} 

Answer 3

而对于一个斯威夫特3版本，你想为每一行调用这个函数。

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 

    let cell = tableView.cellForRow(at: indexPath); 
    UIView.animate(withDuration: 0.3, animations: { 

     cell!.frame = CGRect(x: cell!.frame.origin.x - 100, y: cell!.frame.origin.y, width: cell!.bounds.size.width + 100, height: cell!.bounds.size.height) 

    }) { (finished) in 
     UIView.animate(withDuration: 0.3, animations: { 

      cell!.frame = CGRect(x: cell!.frame.origin.x + 100, y: cell!.frame.origin.y, width: cell!.bounds.size.width - 100, height: cell!.bounds.size.height) 

     }, completion: { (finished) in 
     }) 
    } 
} 

Answer 4

斯威夫特3相当于布拉克的答案。你可以通过编程的方式将这个调用发送到任何你想要的地方，我把它放在一个辅助函数中，这样任何表视图都可以显示出来。第一次用户使用我的应用程序时，我将其滑开（我感觉需要更长的动画时间）。

class func animateRevealHideActionForRow(tableView: UITableView, indexPath: NSIndexPath) { 
    let cell = tableView.cellForRow(at: indexPath as IndexPath); 

    // Should be used in a block 
    var swipeLabel: UILabel? = UILabel.init(frame: CGRect.init(x: cell!.bounds.size.width, y: 0, width: 200, height: cell!.bounds.size.height)) 

    swipeLabel!.text = " Swipe Me"; 
    swipeLabel!.backgroundColor = UIColor.red 
    swipeLabel!.textColor = UIColor.white 
    cell!.addSubview(swipeLabel!) 

    UIView.animate(withDuration: 1.0, animations: { 
     cell!.frame = CGRect.init(x: cell!.frame.origin.x - 100, y: cell!.frame.origin.y, width: cell!.bounds.size.width + 100, height: cell!.bounds.size.height) 
    }) { (finished) in 
     UIView.animate(withDuration: 1.0, animations: { 
      cell!.frame = CGRect.init(x: cell!.frame.origin.x + 100, y: cell!.frame.origin.y, width: cell!.bounds.size.width - 100, height: cell!.bounds.size.height) 
     }, completion: { (finished) in 
      swipeLabel?.removeFromSuperview() 
      swipeLabel = nil; 
     }) 
    } 
}