Cross Directional UIScrollViews - 我可以修改滚动行为吗? [英] Cross Directional UIScrollViews - Can I Modify the Scrolling Behaviour?

问题描述

滚动视图的工作原理如下: 一个滚动视图在水平方向启用分页.此滚动视图的每个页面"都包含一个垂直滚动的 UITableView.如果没有修改，这可以正常工作，但并不完美.

Here's how the scroll views work: One scroll view is paging enabled in the horizontal direction. Each 'page' of this scroll view contains a vertically scrolling UITableView. Without modification, this works OK, but not perfectly.

不正确的行为:当用户在表格视图上上下滚动，但又想快速翻到下一页时，水平滑动/滑动最初不起作用-在表格视图静止之前它不会工作(即使滑动非常明显是水平的).

The behaviour that's not right: When the user scrolls up and down on the table view, but then wants to flick over to the next page quickly, the horizontal flick/swipe will not work initially - it will not work until the table view is stationary (even if the swipe is very clearly horizontal).

它应该如何工作:如果滑动明显是水平的，即使表格视图仍在滚动/弹跳，我也希望页面改变，因为这也是用户期望的.

How it should work: If the swipe is clearly horizontal, I'd like the page to change even if the table view is still scrolling/bouncing, as this is what the user will expect too.

我该如何改变这种行为 - 最简单或最好的方法是什么?

注意 由于各种原因，某些答案中所述的 UIPageViewController 将不起作用.我怎样才能用交叉方向的 UIScrollViews 做到这一点(/one 是一个表格视图，但你明白了)?几个小时以来，我一直在用头撞墙 - 如果您认为自己可以做到这一点，那么我会非常高兴地奖励赏金.

NOTE For various reasons, a UIPageViewController as stated in some answers will not work. How can I do this with cross directional UIScrollViews (/one is a table view, but you get the idea)? I've been banging my head against a wall for hours - if you think you can do this then I'll more than happily award a bounty.

推荐答案

根据我对问题的理解，只有在 tableView 滚动时我们才想要更改默认行为.所有其他行为都将相同.

According to my understanding of the question, it is only while the tableView is scrolling we want to change the default behaviour. All the other behaviour will be the same.

子类 UITableView.UITableView 是 UIScrollView 的子类.在UITableView子类上实现一个UIScrollView的UIGestureRecognizer的委托方法

SubClass UITableView. UITableViews are subClass of UIScrollViews. On the UITableView subClass implement one UIScrollView's UIGestureRecognizer's delegate method

- (BOOL)gestureRecognizer:(UIPanGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UISwipeGestureRecognizer *)otherGestureRecognizer
{
    //Edit 1
    //return self.isDecelerating;
    //return self.isDecelerating | self.bounces; //If we want to simultaneous gesture on bounce and scrolling
    //Edit 2
    return self.isDecelerating || self.contentOffset.y < 0 || self.contentOffset.y > MAX(0, self.contentSize.height - self.bounds.size.height); // @Jordan edited - we don't need to always enable simultaneous gesture for bounce enabled tableViews
}

因为我们只想在 tableView 减速时更改默认手势行为.

As we only want to change the default gesture behaviour while the tableView is decelerating.

现在将所有UITableView 的类"更改为新创建的 tableViewSubClass 并运行该项目，在 tableView 滚动时滑动应该可以工作.:]

Now change all 'UITableView's class to your newly created tableViewSubClass and run the project, swipe should work while tableView is scrolling. :]

但是当 tableView 滚动时，滑动看起来有点过于敏感.让我们限制滑动.

But the swipe looks a little too sensitive while tableView is scrolling. Let's make the swipe a little restrictive.

子类 UIScrollView.在 UIScrollView 子类上实现另一个 UIGestureRecognizer 的委托方法 gestureRecognizerShouldBegin:

SubClass UIScrollView. On the UIScrollView subclass implement another UIGestureRecognizer's delegate method gestureRecognizerShouldBegin:

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer 
{
    if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]]) {
        CGPoint velocity = [(UIPanGestureRecognizer *)gestureRecognizer velocityInView:self];
        if (abs(velocity.y) * 2 < abs(velocity.x)) {
            return YES;
        }
    }
    return NO;
}

我们想让滑动明显是水平的".如果 x 轴上的手势速度是 y 轴上的两倍，则上面的代码仅允许手势开始.[如果您愿意，可以随意增加硬编码值2".滑动需要的值越高，水平越高.]

We want to make the "swipe is clearly horizontal". Above code only permits gesture begin if the gesture velocity on x axis is double than on y axis. [Feel free to increase the hard coded value "2" if your like. The higher the value the swipe needs to be more horizontal.]

现在将UiScrollView"类(具有多个 TableView)更改为您的 ScrollViewSubClass.运行项目.:]

Now change the `UiScrollView' class (which has multiple TableViews) to your ScrollViewSubClass. Run the project. :]

我在 gitHub 上做了一个项目 https://github.com/rishi420/SwipeWhileScroll

I've made a project on gitHub https://github.com/rishi420/SwipeWhileScroll

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