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

问题描述

我希望能够拖动屏幕上的对象，但它们不会.我什么都试过了，还是不行.

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

这是代码.

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")
    }
}

它们也有重力.形式是正方形和圆形.

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

说明:在 .began 中 - 我禁用所选形式的重力.在 .changed - 我尝试更改坐标.在 .end - 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.

屏幕截图.

推荐答案

步骤 1 : 在 storyBoard 中选取一个你想要拖拽的 View.

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.

这篇关于可拖动的 UIView Swift 3的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！