1.app尺寸,去掉状态栏 CGRect r = [ UIScreen mainScreen ].applicationFrame; r=0,20,320,460 2.屏幕尺寸 CGRect rx = [ UIScreen mainScreen ].bounds; r=0,0,320,480 3.状态栏尺寸 CGRect rect; rect = [[UIApplication sharedApplication] statusBarFrame]; 当有导航条的时候,导航条的高度是44,那么整个