Detect Touch on Edge of the UIVIEW

Question

How to detect the touch on the edge or border of the view in iOS Swift. I want to increase UIView width and height when the user drags the border of the UIView.

Answer 1

got the solution Modified How to resize UIView by dragging from its edges? solution.

Swift Version and code to detect edges as well as corners

class OverlayView: UIView {

    /*
    // Only override draw() if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func draw(_ rect: CGRect) {
        // Drawing code
    }
    */


    static var kResizeThumbSize:CGFloat = 44.0
    private typealias `Self` = OverlayView

    var imageView = UIImageView()

    var isResizingLeftEdge:Bool = false
    var isResizingRightEdge:Bool = false
    var isResizingTopEdge:Bool = false
    var isResizingBottomEdge:Bool = false

    var isResizingBottomRightCorner:Bool = false
    var isResizingLeftCorner:Bool = false
    var isResizingRightCorner:Bool = false
    var isResizingBottomLeftCorner:Bool = false


        //Define your initialisers here

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touch = touches.first {
            let currentPoint = touch.location(in: self)

            isResizingBottomRightCorner = (self.bounds.size.width - currentPoint.x < Self.kResizeThumbSize && self.bounds.size.height - currentPoint.y < Self.kResizeThumbSize);
           isResizingLeftCorner = (currentPoint.x < Self.kResizeThumbSize && currentPoint.y < Self.kResizeThumbSize);
            isResizingRightCorner = (self.bounds.size.width-currentPoint.x < Self.kResizeThumbSize && currentPoint.y < Self.kResizeThumbSize);
            isResizingBottomLeftCorner = (currentPoint.x < Self.kResizeThumbSize && self.bounds.size.height - currentPoint.y < Self.kResizeThumbSize);

            isResizingLeftEdge = (currentPoint.x < Self.kResizeThumbSize)
            isResizingTopEdge = (currentPoint.y < Self.kResizeThumbSize)
            isResizingRightEdge = (self.bounds.size.width - currentPoint.x < Self.kResizeThumbSize)

            isResizingBottomEdge = (self.bounds.size.height - currentPoint.y < Self.kResizeThumbSize)

            // do something with your currentPoint

        }
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touch = touches.first {
            let currentPoint = touch.location(in: self)
            // do something with your currentPoint
        }
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touch = touches.first {
            let currentPoint = touch.location(in: self)
            // do something with your currentPoint


            isResizingLeftEdge = false
             isResizingRightEdge = false
             isResizingTopEdge = false
             isResizingBottomEdge = false

             isResizingBottomRightCorner = false
             isResizingLeftCorner = false
             isResizingRightCorner = false
             isResizingBottomLeftCorner = false

        }
    }