1、得到當前屏幕的尺寸:
CGRect rect_screen = [[UIScreenmainScreen]bounds];
CGSize size_screen = rect_screen.size;
2、獲得scale:
CGFloat scale_screen = [UIScreen mainScreen].scale;
CGRect rect_screen = [[UIScreenmainScreen]bounds];
CGSize size_screen = rect_screen.size;
CGFloat scale_screen = [UIScreen mainScreen].scale;