ios - Why the two CGRect don't intersect when they do visually? -

i building app. needs accept user input uitextfields. , keyboard hide text field need move view when keyboard cgrect intersects text field's frame.

i followed this tutorial added of own logic because have multiple text fields.

here relevant code: (the whole thing in vc conforms uitextfielddelegate)

var focusedtextfield: uitextfield? var viewmovedup = false var keyboardsize: cgrect!  override func viewdidappear(animated: bool) {     super.viewdidappear(animated)     nsnotificationcenter.defaultcenter().addobserver(self, selector: selector("keyboardwillshow:"), name:uikeyboardwillshownotification, object: nil);     nsnotificationcenter.defaultcenter().addobserver(self, selector: selector("keyboardwillhide:"), name:uikeyboardwillhidenotification, object: nil);     nsnotificationcenter.defaultcenter().addobserver(self, selector: selector("onrotate:"), name:uideviceorientationdidchangenotification, object: nil); }  override func viewdiddisappear(animated: bool) {     super.viewwilldisappear(animated)     nsnotificationcenter.defaultcenter().removeobserver(self) }  func textfieldshouldreturn(textfield: uitextfield) -> bool {     textfield.resignfirstresponder()     return true }  func textfielddidbeginediting(textfield: uitextfield) {     focusedtextfield = textfield }  func onrotate (notification: nsnotification) {     view.endediting(true) }  func keyboardwillshow(notification: nsnotification) {     if let userinfo = notification.userinfo {         if let keyboardsize =  (userinfo[uikeyboardframeenduserinfokey] as? nsvalue)?.cgrectvalue() {             self.keyboardsize = keyboardsize             assert(focusedtextfield != nil)             if cgrectintersectsrect(focusedtextfield!.bounds, keyboardsize){                 moveview(up: true)             }         }     } }  func keyboardwillhide(notification: nsnotification) {     if viewmovedup {         moveview(up: false)     } }  func moveview (up up: bool) {     let keyboardheight = keyboardsize.height     let movement = (up ? -keyboardheight : keyboardheight)      uiview.animatewithduration(0.3, animations: {         self.view.frame = cgrectoffset(self.view.frame, 0, movement)     })     viewmovedup = } 

if don't want read whole code, i'll explain gist of it. when user taps on 1 of text fields, textfielddidbeginediting gets called. sets focusedtextfield text field user editing. keyboardwillshow gets called. gets keyboard size , assign class-level variable called keyboardsize checks if focused text field (remember that?) covered keyboard (via cgrectintersectrect). if move view calling moveview. method works fine no need explain.

now on problem!

let's @ screen shot of vc:

when tap on "enter a" text field, view moves expected. when tap on "enter p" text field, keyboard shows , covers text field completely.

after debugging, found that

cgrectintersectsrect(focusedtextfield!.bounds, keyboardsize)

returns false moveview not called. "enter p" text field , keyboard size follows:

bounds of text field:     x: 62 y: 94.5     height: 32.5 width: 278 keyboard size:     x: 0 y: 158     height: 162 width: 568 

just these figures, don't think overlap. visually, do!

i tried change focusedtextfield!.bounds focusedtextfield.frame still doesn't work.

why happening? how fix it?

the problem in code:

cgrectintersectsrect(focusedtextfield!.bounds, keyboardsize) 

...you comparing apples , oranges:

• focusedtextfield!.bounds in coordinate space of focusedtextfield

• keyboardsize in coordinate space of the window

(and reason why focusedtextfield.frame didn't work is in yet another coordinate space, of text field's superview.)

those 2 different coordinate spaces, cannot compare these rects. have convert 1 of them coordinate space of other.

for example, think it:

newkeyboardsize = focusedtextfield.convertrect(keyboardsize, fromview:nil) 

now newkeyboardsize , focusedtextfield.bounds should in same coordinate space.