iOS Question Draw a dashed or dotted line around a view

Sub AddDashedBorder(v As View, clr As Int)
   Dim no As NativeObject = Me
   no.RunMethod("addDashedBorder::", Array(v, no.ColorToUIColor(clr)))
End Sub

#if OBJC
- (void) addDashedBorder:(UIView*)v :(UIColor*) clr {
   CAShapeLayer* border;
   NSArray* layers = v.layer.sublayers;
   if ([layers count] == 0 || [layers.lastObject isKindOfClass:[CAShapeLayer class]] == false) {
     border = [CAShapeLayer layer];
     [v.layer addSublayer:border];
   }
   else
     border = layers.lastObject;
   border.strokeColor = clr.CGColor;
   border.fillColor = nil;
   border.lineDashPattern = @[@4, @2];
   
   border.path = [UIBezierPath bezierPathWithRect:v.bounds].CGPath;
   border.frame = v.bounds;
}
#end if