如何仅对顶级子视图检测并应用平移手势

Question

我有一个未知数量的子视图，可以显示在名为mainCanvasView的主视图上。我的目标是，当用户在子视图上进行平移手势时

1. 检测它是哪个子视图，并将该子视图置于mainCanvasView
之上
2. 将平移动画转换仅应用于该子视图

现在，我已经完成了以下工作：

//Added a pan gesture hanlder to mainCanvasView
let panGesture = UIPanGestureRecognizer(target: self, action:#selector(self.handlePanGesture(gesture:)))
self.mainCanvasView.addGestureRecognizer(panGesture)

//Define the method for handling gestures
func handlePanGesture(gesture: UIPanGestureRecognizer) {
    if gesture.state == UIGestureRecognizerState.began || gesture.state == UIGestureRecognizerState.changed {
        var appliedView = UIView(frame: view.frame)
        viewLooper: for view in self.mainCanvasView.subviews {
            let point = gesture.location(in: view)
            if (view.hitTest(point, with: nil) != nil) { //Find the view that the finger interacted with
                appliedView = view
                break viewLooper
            }
        }

        self.mainCanvasView.bringSubview(toFront: appliedView)
        let translation = gesture.translation(in: view)
        appliedView.transform = (appliedView.transform).translatedBy(x: translation.x, y: translation.y)
        gesture.setTranslation(CGPoint(x: 0, y: 0), in: appliedView)
    }
}

正如gif所示，在移动单个子视图时很好，当子视图略微相互重叠时，会产生奇怪的效果，其中两个子视图都会被移动。

非常感谢有关如何解决此问题的任何建议。

Answer 1

删除平移手势这是更好的解决方案（您可以在此处添加自己的改进）

我使用过preg_match( '/^\s*(create|alter|truncate|drop)\s/i', $query ) ) { $return_val = $this->result; 种方法

touch

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) { for view in self.viewMain.subviews { if let point = touches.first?.location(in: self.view) { if let viewTouched = self.view.hitTest(point, with: event),viewTouched == view { viewNew = view viewNew.center = point self.viewMain.bringSubview(toFront: view) print("Tapped") break } else { print("Not Tapped") } } } } override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) { if let point = touches.first?.location(in: self.viewMain) { viewNew.center = point } } override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) { viewNew = UIView() } 是全局viewNew对象

希望它对你有所帮助

Answer 2

检查以下项目，它可以获得所需的输出

used - 在图像上捏合并点按手势并在屏幕上移动图像

Link - https://github.com/RockinGarg/Moving-views-.git

触摸处理图像

import UIKit

class objectClass: UIImageView, UIGestureRecognizerDelegate {

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
                let touch: UITouch = touches.first!
        self.center = touch.location(in: self.superview)

    }

}

其他手势功能

//recognizing gestures
func recognizePinchGesture(sender: UIPinchGestureRecognizer) {
    sender.view!.transform = sender.view!.transform.scaledBy(x: sender.scale, y: sender.scale)
    sender.scale = 1
}

func recognizeRotateGesture(sender: UIRotationGestureRecognizer) {
    sender.view!.transform = sender.view!.transform.rotated(by: sender.rotation)
    sender.rotation = 0
}