ios - How to move view at the center of visible frame when keyboard appears? -

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i have standard uiview (containing image view, 2 textfield , button) embedded in root scroll view. i'm using autolayout put uiview @ center of scroll view, shown in screenshot below.

login screenshot

i trying write method moves uiview when keyboard appears, view appear @ center of smaller visible frame. achieve this, calculated heights.

- (void)keyboardwillshow:(nsnotification *)notification {     // determines size of keyboard frame     cgsize keyboardsize = [[[notification userinfo] objectforkey:uikeyboardframebeginuserinfokey] cgrectvalue].size;      [uiview animatewithduration:0.3 animations:^{         // gets root 'uiview' frame , stores in variable         cgrect viewframe = self.itemsview.frame;         // height of visible frame once keyboard appears         double visibleframeheight = (self.view.frame.size.height - keyboardsize.height);         // how 'uiview' should move         double offset = ((visibleframeheight - viewframe.size.height / 2);         // moves 'uiview'         viewframe.origin.y = -offset;         self.itemsview.frame = viewframe;     }]; }

the problem uiview moved up, shown below.

login screenshot keyboard on screen

why happening , how can fix it?

if view embedded in uiscrollview can adjust scrollview's contentoffset move view (then animation free).

assuming scrollview available on outlet called scrollview, , want keep view centered, shift content offset 1/2 keyboard height. - safer use uikeyboardframeenduserinfokey final frame of keyboard:

- (void)keyboardwillshow:(nsnotification *)notification {     // determines size of keyboard frame     cgsize keyboardsize = [[[notification userinfo] objectforkey:uikeyboardframeenduserinfokey] cgrectvalue].size;     self.scrollview.contentoffset = cgpointmake(0, keyboardsize.height / 2); }  - (void)keyboardwillhide:(nsnotification *)notification {     self.scrollview.contentoffset = cgpointzero; }

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