如何使集合视图响应其自身视图之外的平移手势 [英] How to make a collectionview respond to pan gestures outside of it's own view

问题描述

我的 UIViewController 中有一个 UICollectionView，我希望它响应 UICollectionView 内外的手势.默认情况下，UICollectionView 只响应其自己的 view 内的手势，但我怎样才能让它响应其 view 之外的滑动?

I've got a UICollectionView in my UIViewController and I want it to respond to gestures inside AND outside of the UICollectionView. By default the UICollectionView only responds to the gestures inside its own view but how can I make it respond to swipes outside of its view?

谢谢.

推荐答案

我写了一个视图子类来完成这个:

I wrote a view subclass that accomplishes just this:

#import <UIKit/UIKit.h>

@interface TouchForwardingView : UIView

@property (nonatomic, weak) IBOutlet UIResponder *forwardingTarget;

- (instancetype)initWithForwardingTarget:(UIResponder *)forwardingTarget;


@end

#import "TouchForwardingView.h"

@implementation TouchForwardingView

- (instancetype)initWithForwardingTarget:(UIResponder *)forwardingTarget
{
    self = [super init];
    if (self)
    {
        self.forwardingTarget = forwardingTarget;
    }

    return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesBegan:touches withEvent:event];
    [self.forwardingTarget touchesBegan:touches withEvent:event];
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesEnded:touches withEvent:event];
    [self.forwardingTarget touchesEnded:touches withEvent:event];
}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesCancelled:touches withEvent:event];
    [self.forwardingTarget touchesCancelled:touches withEvent:event];
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    [super touchesMoved:touches withEvent:event];
    [self.forwardingTarget touchesMoved:touches withEvent:event];
}

@end

在界面生成器中，将包含视图的子视图设置为 TouchForwardingView，然后将集合视图分配给 forwardingTarget 属性.

In interface builder, set the subview of the containing view to TouchForwardingView, then assign the collection view to the forwardingTarget property.

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