ios - CGRect intersects 4 rects. How to figure out which rect it intersects mostly? -

if need more details: have uicollectionviewcell draggable. when cell overlaps other cells during dragging want know 1 overlaps in order replace overlapped cell cell. there efficient way this? found nothing helpful in cggeometry. thank you.

you can use cgrectunion() in loop, 1 smallest area 1 greatest overlap. write function deals (and returns a) cgrects, youd need loop though views (cells) again find correct one, i'd keep uiview level... eg

    //helpers      cgfloat cgrectgetarea(cgrect therect){     return therect.size.width * therect.size.height;     }   -(uiview *)viewclosesttoview:(uiview*)keyview fromviews:(nsarray*)comparisonviews{    uiview *result=nil;   cgfloat smallestarea=0.0;     (uiview *view in comparisonviews){      cgfloat area = cgrectgetarea( cgrectunion(view.frame, keyview.frame)  );      if ((area < smallestarea)|| ((nsinteger)smallestarea==0) ){     smallestarea=area;     result=view;     }    } return result; }