此分类包括以下的功能:

• UIView的fram相关属性的获区与设置。
  比如可以这样设置view的x和size代码：

  UIView * view = [UIView new];
  view.left = 20;
  view.size = CGSizeZero;

• 移除所有子View和获得tag对应的view。
  比如可以这样移除subview

  [view removeAllSubviews];

• 获得View最近的ViewController。
  比如可以这样获得离View最近的ViewController

  [view viewController];

• 添加分隔线
  比如在view的底部添加一条分隔线：

  [view addLineBottom];
  这里使用默认颜色和默认线宽。你也可以通过传递参数来定制你自己的添加线的方法。

import "UIView+SExtend.h"

import "XCBDefine.h"

import "Masonry.h"

import "UIColor+Hex.h"

@implementation UIView (SExtend)

• (CGFloat)left {
  return self.frame.origin.x;
  }

• (void)setLeft:(CGFloat)x {
  CGRect frame = self.frame;
  frame.origin.x = x;
  self.frame = frame;
  }
  /////////////////////////////////////////

• (CGFloat)top {
  return self.frame.origin.y;
  }

• (void)setTop:(CGFloat)y {
  CGRect frame = self.frame;
  frame.origin.y = y;
  self.frame = frame;
  }
  /////////////////////////////////////////

• (CGFloat)right {
  return self.left + self.width;
  }

• (void)setRight:(CGFloat)right {
  if(right == self.right){
  return;
  }
  CGRect frame = self.frame;
  frame.origin.x = right - frame.size.width;
  self.frame = frame;
  }
  /////////////////////////////////////////

• (CGFloat)bottom {
  return self.top + self.height;
  }

• (void)setBottom:(CGFloat)bottom {
  if(bottom == self.bottom){
  return;
  }

  CGRect frame = self.frame;
  frame.origin.y = bottom - frame.size.height;
  self.frame = frame;
  }
  /////////////////////////////////////////

• (CGFloat)width {
  return self.frame.size.width;
  }

• (void)setWidth:(CGFloat)width {
  CGRect frame = self.frame;
  frame.size.width = width;
  self.frame = frame;
  }
  /////////////////////////////////////////

• (CGFloat)height {
  return self.frame.size.height;
  }

• (void)setHeight:(CGFloat)height {
  if(height == self.height){
  return;
  }

  CGRect frame = self.frame;
  frame.size.height = height;
  self.frame = frame;
  }
  /////////////////////////////////////////

• (CGFloat)centerX {
  return self.center.x;
  }

• (void)setCenterX:(CGFloat)centerX {
  self.center = CGPointMake(centerX, self.center.y);
  }
  /////////////////////////////////////////

• (CGFloat)centerY {
  return self.center.y;
  }

• (void)setCenterY:(CGFloat)centerY {
  self.center = CGPointMake(self.center.x, centerY);
  }
  /////////////////////////////////////////

• (CGPoint)origin {
  return self.frame.origin;
  }

• (void)setOrigin:(CGPoint)origin {
  CGRect frame = self.frame;
  frame.origin = origin;
  self.frame = frame;
  }
  /////////////////////////////////////////

• (CGSize)size {
  return self.frame.size;
  }

• (void)setSize:(CGSize)size {
  CGRect frame = self.frame;
  frame.size = size;
  self.frame = frame;
  }

• (void)removeAllSubviews {
  for(UIView *view in [self subviews]){
  [view removeFromSuperview];
  }
  }

• (id)subviewWithTag:(NSInteger)tag{
  for(UIView *view in [self subviews]){
  if(view.tag == tag){
  return view;
  }
  }

  return nil;
  }

• (UIViewController)viewController {
  for (UIView next = [self superview]; next; next = next.superview) {
  UIResponder* nextResponder = [next nextResponder];
  if ([nextResponder isKindOfClass:[UIViewController class]]) {
  return (UIViewController*)nextResponder;
  }
  }
  return nil;
  }

pragma mark ---

/***********************************/

• (void)addTopAndBottomLine {
  UIView * lineT = [[UIView alloc] initWithFrame:CGRectMake(0, 0, kSizeScreenWidth, 0.5)];
  lineT.backgroundColor = UI_COLOR_RGB(200, 200, 200);
  [self addSubview:lineT];

  UIView * lineB = [[UIView alloc] initWithFrame:CGRectMake(0, self.height - 0.5, self.width, 0.5)];
  lineB.backgroundColor = UI_COLOR_RGB(200, 200, 200);
  [self addSubview:lineB];
  }

• (void)addLineFormHeight:(CGFloat)height {
  UIView * lineB = [[UIView alloc] initWithFrame:CGRectMake(0, height, self.width, 0.5)];
  lineB.backgroundColor = UIColorFromHex(@"c5c5c5");
  [self addSubview:lineB];
  }

-(void)addLineBottom{
UIView * lineB = [UIView new];
lineB.backgroundColor = UIColorFromHex(@"c5c5c5");
[self addSubview:lineB];
[lineB mas_makeConstraints:^(MASConstraintMaker *make) {
make.height.equalTo(@0.5);
make.right.left.equalTo(self);
make.bottom.equalTo(self);
}];
}
@end