在iOS的界面布局中我们能够使用CGRectGetMaxX 这种方法来方便的获取当前控件的x坐标值+宽度的数值。这样便能够方便布局。

同理CGRectGetMaxY是获取y坐标值+控件高度的值，当然这个系列的方法还有非常多大家能够试下。

/* Return the leftmost x-value of `rect‘. */

CG_EXTERN CGFloat CGRectGetMinX(CGRect rect)
  CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

/* Return the midpoint x-value of `rect‘. */

CG_EXTERN CGFloat CGRectGetMidX(CGRect rect)
  CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

/* Return the rightmost x-value of `rect‘. */

CG_EXTERN CGFloat CGRectGetMaxX(CGRect rect)
  CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

/* Return the bottommost y-value of `rect‘. */

CG_EXTERN CGFloat CGRectGetMinY(CGRect rect)
  CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

/* Return the midpoint y-value of `rect‘. */

CG_EXTERN CGFloat CGRectGetMidY(CGRect rect)
  CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

/* Return the topmost y-value of `rect‘. */

CG_EXTERN CGFloat CGRectGetMaxY(CGRect rect)
  CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

/* Return the width of `rect‘. */

CG_EXTERN CGFloat CGRectGetWidth(CGRect rect)
  CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

/* Return the height of `rect‘. */

CG_EXTERN CGFloat CGRectGetHeight(CGRect rect)
  CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);