ios - Set limit to draggable item in Swift -


i have 1 imageview , textfield on image. make textfield draggable below code can draggable anywhere in screen. want textfield draggable in limit of imageview. if uncomment if check in draagedview function, textfield stuck @ left side of imageview because x values become same.

i found solution can't modify work on project. use uipangesturerecognizer drag uiview inside limited area

  override func viewdidload() {     super.viewdidload()     // additional setup after loading view, typically nib.     let gesture = uipangesturerecognizer(target: self, action: #selector(viewcontroller.draggedview(_:)))     bottomtextfield.addgesturerecognizer(gesture)     bottomtextfield.isuserinteractionenabled = true }   func userdragged(gesture: uipangesturerecognizer){     let loc = gesture.location(in: self.view)     self.bottomtextfield.center = loc } func draggedview(_ sender:uipangesturerecognizer) {     let compare = myimageview.frame.maxx <= bottomtextfield.frame.maxx     //if(myimageview.frame.minx <= bottomtextfield.frame.minx && compare )     // {     self.view.bringsubview(tofront: sender.view!)     let translation = sender.translation(in: self.view)     sender.view!.center = cgpoint(x: sender.view!.center.x + translation.x, y: sender.view!.center.y + translation.y)     sender.settranslation(cgpoint.zero, in: self.view)      // } }

the main problem checking position before translation. means text field ends in invalid position, after if block never reached.

this different way approach problem , means text field reaches right edges of limit:

func draggedview(_ sender: uipangesturerecognizer) {    guard let senderview = sender.view else {     return   }    var translation = sender.translation(in: view)    translation.x = max(translation.x, myimageview.frame.minx - bottomtextfield.frame.minx)   translation.x = min(translation.x, myimageview.frame.maxx - bottomtextfield.frame.maxx)    translation.y = max(translation.y, myimageview.frame.miny - bottomtextfield.frame.miny)   translation.y = min(translation.y, myimageview.frame.maxy - bottomtextfield.frame.maxy)    senderview.center = cgpoint(x: senderview.center.x + translation.x, y: senderview.center.y + translation.y)   sender.settranslation(.zero, in: view)   view.bringsubview(tofront: senderview) }

i have made bit safer adding guard statement @ top , removing force unwraps.


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