drawing - Transform a view by dragging its edge (Swift) -

i try make app user can draw or add arrow, , transform arrow (translate, rotate, ...). moment, manage draw arrow , make transformations on it, able modify arrow dragging edges.

to draw arrow, create uiview height of 20px (it thickness of arrow), , width of 400 (length of arrow).

func drawarrow(frame: cgrect) {     let thicknessarrow = 20     let viewhorizontalarrow = uiview()     viewhorizontalarrow.frame.origin = cgpoint(x: 100, y: 600)     viewhorizontalarrow.frame.size = cgsize(width: 400, height: thicknessarrow)      drawdoublearrow(viewhorizontalarrow, startpoint: cgpoint(x: 0, y: thicknessviewwitharrow/2), endpoint: cgpoint(x: viewhorizontalarrow.frame.width, y: thicknessviewwitharrow/2), linewidth: 10, color: uicolor.blackcolor())  } 

after that, transform uiview pan, pinch , rotate gesture.

the function "drawdoublearrow" create arrow bezierpath , add layer of uiview.

i hope these explanations clear enough :).

could me find solution ?

thanks !

uibezierpath on it's own cannot manipulated gestures because doesn't recognize them. uiview can recognize gestures. combined calayer's ability transformed , it's hittest() method, think can achieve want.

// i'm declaring layer shape layer, depending on how error thick is, may need rectangular 1 let pangesture = uipangesturerecognizer() var mylayer = cashapelayer() 

viewdidload:

// i'm assuming you've created mybezierpath, arrow path mylayer.path = mybezierpath.cgpath  // adding pan gesture view's controller pangesture.addtarget(self, action: #selector(movelayer)) self.addgesturerecognizer(pangesture) 

movelayer:

func movelayer(_ recognizer:uipangesturerecognizer) {     let p = recognizer.location(in: self)      // want loop through layers wish transform     if mylayer.hittest(p) != nil {         mylayer.position = p     } }