如何使集合视图响应其自身视图之外的平移手势

Posted 2023-03-14

【中文标题】如何使集合视图响应其自身视图之外的平移手势

【英文标题】：How to make a collectionview respond to pan gestures outside of it's own view

【发布时间】：2016-09-20 13:39:14

【问题描述】：

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

谢谢。

【问题讨论】：

在您的viewController 中使用touches:began

【参考方案1】：

我写了一个视图子类来完成这个：

#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。

【参考方案2】：

Nailer 的答案的 Swift 版本，这会将在 viewcontroller 上完成的所有手势转发到 collectionview

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) 
    collectionView.touchesBegan(touches, withEvent: event)

override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) 
    collectionView.touchesEnded(touches, withEvent: event)

override func touchesCancelled(touches: Set<UITouch>?, withEvent event: UIEvent?) 
    collectionView.touchesCancelled(touches, withEvent: event)

override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) 
    collectionView.touchesMoved(touches, withEvent: event)

【参考方案3】：

Steven B 对 Swift 4 的回答 :)

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) 
    collectionView.touchesBegan(touches, with: event)

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) 
    collectionView.touchesEnded(touches, with: event)

override func touchesCancelled(_ touches: Set<UITouch>?, with event: UIEvent?) 
    collectionView.touchesCancelled(touches!, with: event)

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) 
    collectionView.touchesMoved(touches, with: event)