ios - 在iOS上像手套一样捏放大

我已经迅速发布了iOS应用，其主要功能是:
1)添加照片/拍照
2)在照片上添加表情符号
3)缩放，旋转，拖动表情符号来装饰照片
4)在Instagram上分享。

表情符号可以旋转，缩放和拖动。我已使用UIRoationGestrueRecognizer，UIPinchGestureRecognizer和UIPanGesstureRecognizer等UIGestureRecognizers实现了这些功能。

现在，我正在尝试使用类似手套的缩小缩放功能来更新应用程序，用户可以将两个手指之间的表情符号放大/缩小到最大程度。当前的捏合手势仅在用户的手指位于imageView(表情符号)上时有效。

任何想法/示例代码如何进行类似手套的捏缩放？下面的代码是我处理旋转，收缩和拖动的方式。提前致谢。

// UI Gesture Recognizers
@IBAction func handlePinch(recognizer : UIPinchGestureRecognizer) {
    if(deleteMode) {
        return
    }
    if let view = recognizer.view {
        view.transform = CGAffineTransformScale(view.transform,
            recognizer.scale, recognizer.scale)
        recognizer.scale = 1
    }
}

@IBAction func handleRotate(recognizer : UIRotationGestureRecognizer) {
    if(deleteMode) {
        return
    }
    if let view = recognizer.view {
        view.transform = CGAffineTransformRotate(view.transform, recognizer.rotation)
        recognizer.rotation = 0
    }
}

@IBAction func handlePan(recognizer:UIPanGestureRecognizer) {
    if(deleteMode) {
        return
    }
    let translation = recognizer.translationInView(self.view)
    var centerX: CGFloat!
    var centerY: CGFloat!

    if let view = recognizer.view {

        // limit the boundary - using backgroundPanel.frame.width, height, origin.x, origin.y
        if(view.center.x + translation.x < panelBackground.frame.origin.x) {
            centerX = view.center.x + translation.x + 10
        } else if(view.center.x > panelBackground.frame.size.width){
            centerX = view.center.x + translation.x - 10
        } else {
            centerX = view.center.x + translation.x
        }

        if(view.center.y < panelBackground.frame.origin.y - 60){
            // set y that I can use below
            centerY = view.center.y + translation.y + 10
        } else if(view.center.y > panelBackground.frame.size.height){
            centerY = view.center.y + translation.y - 10
        } else {
            centerY = view.center.y + translation.y
        }

        // set final position
        view.center = CGPoint(x:centerX,
            y:centerY)

        recognizer.setTranslation(CGPointZero, inView: self.view)

    }
}

@IBAction func handleLongPress(recognizer: UILongPressGestureRecognizer) {
    if(recognizer.state == UIGestureRecognizerState.Began) {
        if(!deleteMode) {
            print("LongPress - Delete Shows")
            for (_, stickers) in self.backgroundImage.subviews.enumerate() {
                for (_, deleteButtons) in stickers.subviews.enumerate() {
                    if let delete:UIImageView = deleteButtons as? UIImageView{
                        if(delete.accessibilityIdentifier == "delete") {
                            delete.alpha = 0.5
                        }
                    }
                }
            }
            deleteMode = true
        } else {
            deleteButtonHides()
        }
    }
}

最佳答案

我也希望同时进行拖拉，平移和缩放，例如手套，但是如果您只是在寻找缩放。我正在使用下面的功能通过捏捏来缩放标签。它不是很平滑，但是可以进行缩放。

  func handlePinch(recognizer: UIPinchGestureRecognizer) {
    if let view = recognizer.view as? UILabel {
        let pinchScale: CGFloat = recognizer.scale
        view.transform = view.transform.scaledBy(x: pinchScale, y: pinchScale)
        recognizer.scale = 1.0
    }
}

要同时进行拖动，平移和缩放，请查看以下文章:

Pinch, drag and pan at the same time

关于ios - 在iOS上像手套一样捏放大，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/35756473/