将一个 UIImageView 与另一个 UIImageView 一起推送，可能吗？

发布于 2024-12-04 18:28:07 字数 275 浏览 0 评论 0原文

是否可以平移 UIImageView，并且当它与另一个 UIImageView 的框架相交时，是否可以让另一个 UIImageView 被另一个 UIImageView 推动而不只是越过它？我希望这是有道理的！

如果可能的话，您能给我一些关于如何实施这个的想法吗？

我想它会像...

如果框架在 x/y 轴上从左或右与框架相交，则让另一个框架沿相同方向移动，距离与推动框架相同。虽然这个逻辑对我来说有点道理，但我不确定如何在代码中实现它。

我真的很感激你能提供的任何建议。

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错爱 2024-12-11 18:28:07

所以，你只关心左/右平移...

让我们假设你有 2 个 UIImageViews，一个 & 。 b，作为其他一些 UIView 的子视图并定义为某个类的类成员。

您可以通过创建 UIPanGestureRecognizer 实例并使用方法 addGestureRecognizer 将它们添加到每个 UIImageView 来获得检测每个视图上的平移手势（拖动触摸）的帮助：

创建每个 UIPanGestureRecognizer 时，您需要指定一个选择器来接收手势事件。假设它被称为 didMove：

现在，一些示例代码：

- (void) didMove:(UIPanGestureRecognizer*)recognizer {
    UIView* view = [recognizer view];

    // Remember our UIImageViews are class members called, a & b
    //
    UIView* otherView = view == a ? b : a;    

    if (recognizer.state == UIGestureRecognizerStateBegin 
        || recognizer.state == UIGestureRecognizerStateChanged) {

        // Moving left will have a negative x, moving right positive
        //
        CGPoint translation = [recognizer translationInView:view.superview];
        view.center = CGPointMake(view.center.x + translation.x, view.center.y);

        // Reset so we always track the translation from the current view position
        //
        [recognizer setTranslation:CGPointZero inView:view.superview];

        if (CGRectIntersectsRect(view.frame, otherView.frame)) {
            // Translate by the same number of points to keep views in sync
            //
            otherView.center = CGPointMake(otherView.center.x + translation.x, otherView.center.y);
        }
    }
}

它可能不完全是您所需要的，但它应该让您很好地了解如何完成它。

So, you're only concerned with left / right panning...

Let's assume you have 2 UIImageViews, a & b, as subviews of some other UIView and defined as class members of some class.

You can get help detecting panning gestures (dragging touches) on each of these views by creating instances of UIPanGestureRecognizer and adding them to each UIImageView using method addGestureRecognizer:

When creating each UIPanGestureRecognizer, you need to designate a selector to receive the gesture events. Let say it's called didMove:

Now, some sample code:

- (void) didMove:(UIPanGestureRecognizer*)recognizer {
    UIView* view = [recognizer view];

    // Remember our UIImageViews are class members called, a & b
    //
    UIView* otherView = view == a ? b : a;    

    if (recognizer.state == UIGestureRecognizerStateBegin 
        || recognizer.state == UIGestureRecognizerStateChanged) {

        // Moving left will have a negative x, moving right positive
        //
        CGPoint translation = [recognizer translationInView:view.superview];
        view.center = CGPointMake(view.center.x + translation.x, view.center.y);

        // Reset so we always track the translation from the current view position
        //
        [recognizer setTranslation:CGPointZero inView:view.superview];

        if (CGRectIntersectsRect(view.frame, otherView.frame)) {
            // Translate by the same number of points to keep views in sync
            //
            otherView.center = CGPointMake(otherView.center.x + translation.x, otherView.center.y);
        }
    }
}

It may not be exactly what you need, but it should give you a good idea how it could be done.

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