UIView各个方位边框

• (void)setBorderWithView:(UIView *)view top:(BOOL)top left:(BOOL)left bottom:(BOOL)bottom right:(BOOL)right borderColor:(UIColor *)color borderWidth:(CGFloat)width
  {
  if (top) {
  CALayer *layer = [CALayer layer];
  layer.frame = CGRectMake(0, 0, view.frame.size.width, width);
  layer.backgroundColor = color.CGColor;
  [view.layer addSublayer:layer];
  }
  if (left) {
  CALayer *layer = [CALayer layer];
  layer.frame = CGRectMake(0, 0, width, view.frame.size.height);
  layer.backgroundColor = color.CGColor;
  [view.layer addSublayer:layer];
  }
  if (bottom) {
  CALayer *layer = [CALayer layer];
  layer.frame = CGRectMake(0, view.frame.size.height - width, view.frame.size.width, width);
  layer.backgroundColor = color.CGColor;
  [view.layer addSublayer:layer];
  }
  if (right) {
  CALayer *layer = [CALayer layer];
  layer.frame = CGRectMake(view.frame.size.width - width, 0, width, view.frame.size.height);
  layer.backgroundColor = color.CGColor;
  [view.layer addSublayer:layer];
  }
  }