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UITableview不向上滚动

[英]UITableview Does Not Scroll Up

原文 2013-08-09 04:49:42 3 1 ios/ objective-c/ cocoa-touch/ uitableview/ uiscrollview

I am having some scrolling issues with my tableview. 我的tableview出现一些滚动问题。

Swiping/panning upwards, the tableview scrolls down. 向上滑动/平移，tableview向下滚动。
Swiping/panning down does not work, the tableview stays rigid. 向下滑动/平移不起作用，表格视图保持刚性。
Swiping/panning upwards, and then quickly swiping downwards works (scrolls up). 向上滑动/平移，然后快速向下滑动（向上滚动）。

Does anyone have any idea why something like this may happen? 有谁知道为什么会发生这种情况？

Each cell has an image, and a couple of buttons. 每个单元都有一个图像和几个按钮。

I am using SDWebImage, and this issues occurs even once the images are downloaded and cached. 我正在使用SDWebImage，即使下载并缓存了图像，也会出现此问题。

The imageviews' userInteractionEnabled are set to YES, so that should not be a problem either. imageviews的userInteractionEnabled设置为YES，因此也不是问题。

1 个解决方案

I noticed that scrolling, in general, did not work at the top 70% of my screen. 我注意到，滚动通常不会在屏幕的前70％起作用。

So only when swiping down past the 70% threshold, would the app detect scrolling, hence it would scroll down. 因此，只有向下滑动超过70％阈值时，应用程序才会检测到滚动，因此它将向下滚动。

This was because I was using a Dropdown Menu that I found on GitHub (it covered the top 70% of the screen when it was open), that unfortunately interfered with the scrolling, even when hidden. 这是因为我使用的是我在GitHub上找到的Dropdown Menu（下拉菜单在打开时覆盖了屏幕的前70％），不幸的是，即使隐藏起来，也干扰了滚动。

So basically, for anyone who has the same problem in the future, check for interfering views , that may be affecting the scrolling performance. 因此，基本上，对于以后遇到相同问题的任何人， 请检查是否存在干扰视图 ，这可能会影响滚动性能。 Especially look for views and other elements from external code/libraries . 尤其要从外部代码/库中查找视图和其他元素 。

If this is not the case, check UIGestureRecognizers as suggested by @RandyJames and @liuyadong in the comments above. 如果不是这种情况， 请检查 @RandyJames和@liuyadong在上面的注释中建议的UIGestureRecognizers 。