[英]Create a subView using CGPath and than adding UIPanGestureRecognizer on that subview
我已经看到了有关将GestureRecognzier
添加到subViews的几个答案,但是我的问题是我没有预先可用的subView框架。 我正在绘制CGPath
并在Touches Ended
方法中创建了一个等于CGPath
边界框的新子subView
。 在那之后,我想拖动subView
与PanGestureRecognizer
。 我正在尝试实现Evernote crop
功能,用户可以在其中选择特定的视图区域并将其移动到其他位置。 这是该解决方案的正确方法吗?
不太了解UIGestureRecognizer
和.frame
之间的关系。 您只需将UIGestureRecognizer
添加到对象,即可完成其初始化工作。 尝试在绘制子视图后直接在TouchEnd
方法中添加手势。
import UIKit
class GestureResearchVC: UIViewController{
var subViewByCGPath: UIView?
override func viewDidLoad() {
super.viewDidLoad()
}
func createSubView(){
//creat subview
subViewByCGPath = UIView(frame: CGRect(x: 100, y: 100, width: 100, height: 100))
subViewByCGPath?.backgroundColor = UIColor.yellow
let circlePath = UIBezierPath(arcCenter: CGPoint(x: 50,y: 50), radius: CGFloat(20), startAngle: CGFloat(0), endAngle:CGFloat(M_PI * 2), clockwise: true)
let shapeLayer = CAShapeLayer()
shapeLayer.path = circlePath.cgPath
shapeLayer.strokeColor = UIColor.red.cgColor
subViewByCGPath?.layer.addSublayer(shapeLayer)
self.view.addSubview(subViewByCGPath!)
//add pan gesture to subViewByCGPath
let gesture = UIPanGestureRecognizer(target: self, action: #selector(panGestureAction(rec:)))
subViewByCGPath?.addGestureRecognizer(gesture)
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
if subViewByCGPath == nil {
print("touch end once")
createSubView()
}else{
print("touch end repeatedly")
}
}
func panGestureAction(rec: UIPanGestureRecognizer){
print("pannnnnnn~")
let transPoint = rec.translation(in: self.view)
let x = rec.view!.center.x + transPoint.x
let y = rec.view!.center.y + transPoint.y
rec.view!.center = CGPoint(x: x, y: y)
rec.setTranslation(CGPoint(x: 0, y: 0), in: self.view)
//distinguish state
switch rec.state {
case .began:
print("began")
case .changed:
print("changed")
case .ended:
print("ended")
default:
print("???")
}
}
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.