_border = [CAShapeLayer layer];
_border.strokeColor = _borderColor.CGColor;
_border.fillColor = nil;
_border.path = [UIBezierPathbezierPathWithRect:_borderView.bounds].CGPath;
_border.frame = _borderView.bounds;
_border.lineWidth = 1.f;
_border.lineCap = @"square";
_border.lineDashPattern = @[@4, @2];
[_borderView.layer addSublayer:_border];