ios - Xcode UIScrollView zoom same as MKMapView zoom (no effect on subview) -

i want add zoom effect on uiscrollview . have achieved uiscrollview delegate methods.

(uiview *)viewforzoominginscrollview:(uiscrollview *)scrollview.

now want add effect mkmapview having in it, if zoom-in or zoom-out mkmapview place marker of map remains @ same place , same size. how can can achieve same effect uiscrollview zoom effect.

my initial guess cgaffinetransform. question when , how?

thanks, jay stepin.

if understand correctly, want able zoom scroll view in , out while visual objects on remain "anchored" locations. i'd suggest use uiscrollview's zoomscale property tells multiplier should apply scroll view's content positions.

say, have object (uiimage, example) it's center @ x = 100.0, y = 100.0 , zoomscale = 1.0. define couple of constants/variables store coordinates somewhere (let's call them initialx , initialy, example). track zoomscale value in uiscrollviewdelegate protocol's - scrollviewdidzoom: method , multiply initial (not current!) coordinates zoomscale's value.

e.g. (adjust code):

#pragma mark - uiscrollviewdelegate  - (void)scrollviewdidzoom:(uiscrollview *)scrollview {     cgfloat currentscale = scrollview.zoomscale;      // adjust object's position.     cgpoint currentcenter = yourobject.center;      currentcenter.x = initialx * currentscale;     currentcenter.y = initialy * currentscale;      yourobject.center = currentcenter; } 

hope helps.