Question

我无法滚动查看滚动视图（在表格视图中）。基本上，我有一个if语句，用于检查水平移动是否大于垂直移动。如果是，则在单元格上执行平移手势。另外，我希望tableview能够正常滚动。我尝试使用self.scrollview.enabled = yes的一些变体，但我无法使其正常工作。

它适用于水平平移手势，但我不能让它在else部分正确滚动。这是最相关的代码:(对不起，如果它很糟糕 - 我还是iOS / Objective C的新手）。哦，如果你在代码提取中随机看到一个奇怪的'代码'，请忽略它 - 我在格式化时遇到了一些问题而且我丢了一个字。

-(void)handlePan:(UIPanGestureRecognizer *)panGestureRecognizer
{
    CGPoint location = [panGestureRecognizer locationInView:_tableView];

    //Get the corresponding index path within the table view
    NSIndexPath *indexPath = [_tableView indexPathForRowAtPoint:location];
    TVTableCell *cell = [_tableView cellForRowAtIndexPath:indexPath];

    CGPoint translation = [panGestureRecognizer translationInView:cell];
    // Check for horizontal gesture
    if (fabsf(translation.x) > fabsf(translation.y)) {
        CGPoint originalCenter = cell.center;

        if (panGestureRecognizer.state == UIGestureRecognizerStateBegan) {
            NSLog(@"pan gesture started");
        }

        if (panGestureRecognizer.state == UIGestureRecognizerStateChanged) {
            // translate the center

            CGPoint translation = [panGestureRecognizer translationInView:self.view];
            if (translation.x > 0) {
                cell.center = CGPointMake(originalCenter.x + (translation.x-(translation.x-3)), originalCenter.y);
            } else {
                cell.center = CGPointMake(originalCenter.x + (translation.x-(translation.x+3)), originalCenter.y);
            }

            // determine whether the item has been dragged far enough to initiate a delete / complete
            //this will be implemented eventually
            //  _deleteOnDragRelease = self.frame.origin.x < -self.frame.size.width / 2;
            NSLog(@"state changed");
        }


        if (panGestureRecognizer.state == UIGestureRecognizerStateEnded) {
            // the frame this cell would have had before being dragged
            CGRect originalFrame = CGRectMake(0, cell.frame.origin.y,
                                              cell.bounds.size.width, cell.bounds.size.height);
            //    if (!_deleteOnDragRelease) {
            // if the item is not being deleted, snap back to the original location
            [UIView animateWithDuration:0.2
                             animations:^{
                                 cell.frame = originalFrame;

                             }
             ];

        }
    } else {
        //else: scroll tableview normally
        NSLog(@"dear god act normally");
    }
}

感谢您的帮助，非常欢迎所有建议。

Answer 1

我真的不喜欢UITableView，但我想问题是将自定义UIPanGestureRecognizer分配给_tableView，您基本上会使默认值无效。无论如何，你可以用这种方式解决它。

让我们假设您在ViewController中执行所有操作，即使它非常脏。

使ViewController符合UIGestureRecognizerDelegate protocol

在ViewController.m覆盖gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:方法。

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

正如文件所说：

询问代表是否应允许两个手势识别器同时识别手势。

返回值
  是，允许gestureRecognizer和otherGestureRecognizer同时识别他们的手势。默认实现返回NO - 不能同时识别两个手势。

这样你的pan识别器和默认的UITableView都会运行。

您需要做的最后一件事是将ViewController设置为UIPanGestureRecognizer的委托：

UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
panRecognizer.delegate = self;

注意：这是您可以实施的最重要且最脏的解决方案。更好的解决方案是将手势跟踪逻辑转换为单元格本身，或者将UIPanGestureRecognizer子类化。也请看this answer。

在其他平移手势后告诉ScrollView滚动

1 个答案: