57*57    (iPhone, <=iOS 6.1, standard resolution)114*114  (iPhone, <=iOS 6.1, high resolution)60*60    (iPhone, >=iOS 7.0, standard resolution)120*120  (iPhone, >=iOS 7.0, high resolution)72*72    (iPad,   <=iOS 6.1, standard resolution)144*144  (iPad,   <=iOS 6.1, high resolution)76*76    (iPad,   >=iOS 7.0, standard resolution)152*152  (iPad,   >=iOS 7.0, high resolution)

512*512    (standard resolution)1024*1024  (high resolution)

320*480   (3.5 inch, standard resolution)640*960   (3.5 inch, high resolution)640*1136  (4.0 inch, high resolution)