你能够将UIGestureRecognizer附加到多个视图上吗？

Question

你能够将UIGestureRecognizer附加到多个视图上吗？

256

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapTapTap:)];
[self.view1 addGestureRecognizer:tapGesture];
[self.view2 addGestureRecognizer:tapGesture];
[tapGesture release];

在上面的代码中，只有对view2的点击被识别。如果我注释掉第三行，则可以识别对view1的点击。如果我正确，只能使用一次手势识别器，那么我不确定这是一个错误还是需要更多的文档说明。

- kubi

13个回答

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- RyanNa · Answer 1

我知道这是一个旧帖子，但我发现类似的东西，希望对其他人有用。我只是将我的imageView存储在一个数组中，并在一个函数中将其分配给相同的手势识别器，以设置每个imageView。

在我的viewDidLoad()中：

imageViewList = [imageView, imageView2, imageView3]
setupImageViews(imageViews: imageViewList)

设置图像视图的函数：

func setupImageViews(imageViews: [UIImageView]) {
    
    for imageView in imageViews {
        let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(imageTapped(tapGestureRecognizer:)))
        imageView.isUserInteractionEnabled = true
        imageView.addGestureRecognizer(tapGestureRecognizer)
        
        //set up image to be displayed with the right aspect
        imageView.autoresizingMask = [.flexibleWidth, .flexibleHeight, .flexibleBottomMargin, .flexibleRightMargin, .flexibleLeftMargin, .flexibleTopMargin]
        imageView.contentMode = .scaleAspectFit // OR .scaleAspectFill
        imageView.clipsToBounds = true
    }
}

在action selector的imageTapped()方法中，您可以为每个被点击的图片视图编写相应的代码。

@objc func imageTapped(tapGestureRecognizer: UITapGestureRecognizer)
{
    switch tapGestureRecognizer.view {
    case imageView:
        print("tapped Image View 1") //add your actions here
    case imageView2:
        print("tapped Image View 2") //add your actions here
    case imageView3:
        print("tapped Image View 3") //add your actions here
    default:
        print("Tap not detected")
    }
    _ = tapGestureRecognizer.view as! UIImageView
    //additional code...
}

- Naqeeb · Answer 2

要在Swift中为多个视图添加轻拍手势，您可以使用循环来遍历这些视图，并将手势识别器添加到每个视图中。以下是一个示例：

let views = [view1, view2, view3, view4]
        views.forEach { view in
            let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
            view.isUserInteractionEnabled = true
            view.addGestureRecognizer(tap)
        }
    }
    
    @objc func handleTap(_ sender: UITapGestureRecognizer? = nil) {
        switch sender?.view {
        case view1:
            //do something
        case view2:
            //do something
        default:
            break
        }
    }

- Dilip Manek · Answer 3

你可以使用这段代码，在xib中的我的视图（imageviews）上实现它。

- (void)viewDidLoad
{
    firstIV.tag = 501;
    secondIV.tag = 502;
    thirdIV.tag = 503;
    forthIV.tag = 504;

    [self addTapGesturetoImageView: firstIV];
    [self addTapGesturetoImageView: secondIV];
    [self addTapGesturetoImageView: thirdIV];
    [self addTapGesturetoImageView: forthIV];
}

-(void)addTapGesturetoImageView:(UIImageView*)iv
{
    iv.userInteractionEnabled = YES;
    UITapGestureRecognizer * textfielBGIVTapGasture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(textfielBGIVTapped:)];
    textfielBGIVTapGasture.numberOfTapsRequired = 1;
    [iv addGestureRecognizer:textfielBGIVTapGasture];
}

- (void)textfielBGIVTapped:(UITapGestureRecognizer *)recognizer {
    int tag = recognizer.view.tag-500;
    switch (tag) {
        case 1:
        {
            //firstIV tapped;
            break;
        }
        case 2:
        {
            //secondIV tapped;
            break;
        }
        case 3:
        {
            //thirdIV tapped;
            break;
        }
        case 4:
        {
            //forthIV tapped;
            break;
        }
        default: {
            break;
        }
    }
}