可拖动的UIView Swift 3 [英] Draggable UIView Swift 3

问题描述

我希望能够在屏幕上拖动对象，但他们不会。我尝试了一切但仍然不能。

I want to be able to drag the objects on the screen, but they wont. I tried everything but still cant.

以下是代码。

func panGesture(gesture: UIPanGestureRecognizer) {
    switch gesture.state {
    case .began:
        print("Began.")
        for i in 0..<forms.count {
            if forms[i].frame.contains(gesture.location(in: view)) {
                gravity.removeItem(forms[i])
            }
        }
    case .changed:
        let translation = gesture.translation(in: forms[1])

        gesture.view!.center = CGPoint(x: gesture.view!.center.x + translation.x, y: gesture.view!.center.y + translation.y)

        gesture.setTranslation(CGPoint.zero, in: self.view)

        print("\(gesture.view!.center.x)=\(gesture.view!.center.y)")
        print("t;: \(translation)")
    case .ended:
        for i in 0..<forms.count {
            if forms[i].frame.contains(gesture.location(in: view)) {
                gravity.addItem(forms[i])
            }
        }
        print("Ended.")
    case .cancelled:
        print("Cancelled")
    default:
        print("Default")
    }
}

他们也有引力。表格是正方形和圆形。

Also they have gravity. The forms are squares and circles.

说明：
in .began - 我禁用所选表格的重力。
in .changed - 我尝试更改坐标。 .bnd中的
- 我再次启用重力。

Explanation: in .began - i disable the gravity for selected form. in .changed - i try to change the coordinates. in .end - i enable again gravity.

ScreenShot。

ScreenShot.

推荐答案

第1步：在StoryBoard中选择一个要拖动的视图。

Step 1 : Take one View which you want to drag in storyBoard.

@IBOutlet weak var viewDrag: UIView!

第2步：添加PanGesture。

Step 2 : Add PanGesture.

var panGesture       = UIPanGestureRecognizer()

第3步：在ViewDidLoad中添加以下代码。

Step 3 : In ViewDidLoad adding the below code.

override func viewDidLoad() {
    super.viewDidLoad()

    panGesture = UIPanGestureRecognizer(target: self, action: #selector(ViewController.draggedView(_:)))
    viewDrag.isUserInteractionEnabled = true
    viewDrag.addGestureRecognizer(panGesture)

}

第4步： draggedView的代码。

Step 4 : Code for draggedView.

func draggedView(_ sender:UIPanGestureRecognizer){
    self.view.bringSubview(toFront: viewDrag)
    let translation = sender.translation(in: self.view)
    viewDrag.center = CGPoint(x: viewDrag.center.x + translation.x, y: viewDrag.center.y + translation.y)
    sender.setTranslation(CGPoint.zero, in: self.view)
}

第5步：输出。

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