我有一个 imageView，我在其层中绘制了一个蓝色圆圈。我希望用户能够在 UIImageView 中的任何位置点击、按住并拖动这个蓝色圆圈。我不确定如何将此形状附加到 UIPanGestureRecognizer。到目前为止，我的努力如下:
class DrawCircleViewController: UIViewController {
@IBOutlet weak var imgView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// DRAW A FILLED IN BLUE CIRCLE
drawBlueCircle()
// ADD GESTURE RECOGNIZER
let panRecgonizer = UIPanGestureRecognizer.init(target: ???, action: <#T##Selector?#>)
}
func drawBlueCircle(){
let fourDotLayer = CAShapeLayer()
fourDotLayer.path = UIBezierPath.init(roundedRect: CGRect.init(x: 60, y: 60, width: 30, height: 30), cornerRadius: 50).cgPath
fourDotLayer.fillColor = UIColor.blue.cgColor
self.imgView.layer.addSublayer(fourDotLayer)
}
}
最佳答案
使用此代码移动 View
@objc func handlePanRecgonizer(_ gestureRecognizer: UIPanGestureRecognizer){
if panRecgonizer.state == .began || panRecgonizer.state == .changed {
let translation = panRecgonizer.translation(in: self.view)
panRecgonizer.view!.center = CGPoint(x: panRecgonizer.view!.center.x + translation.x, y: panRecgonizer.view!.center.y + translation.y)
panRecgonizer.setTranslation(CGPoint.zero, in: self.view)
}
}
如果您想以编程方式添加UIPanGestureRecognizer:
let gestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePanRecgonizer))
self.someDraggableView.addGestureRecognizer(gestureRecognizer)
关于ios - 如何将 UIPanGestureRecognizer 添加到在 CAShapLayer 上绘制的形状 - swift？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52329834/