Question

I have a view controller based app that contains several views that I display/hide depending on some logic. I would like to draw a rectangle which will be the size of the UIView in order to give it like a frame/border shape.

I’m having issue drawing a rectangle. I understand that the following code should do it but I’m not sure why this method is not being called or triggered. I also didn’t see the (void)drawRect:(CGRect)rect method generated anywhere so I placed it myself. Not sure what I’m missing here..

- (void)drawRect:(CGRect)rect;
{   
    CGContextRef context = UIGraphicsGetCurrentContext(); 
    CGContextSetRGBStrokeColor(context, 1.0, 1.0, 0.0, 1.0); // yellow line

    CGContextBeginPath(context);

    CGContextMoveToPoint(context, 50.0, 50.0); //start point
    CGContextAddLineToPoint(context, 250.0, 100.0);
    CGContextAddLineToPoint(context, 250.0, 350.0);
    CGContextAddLineToPoint(context, 50.0, 350.0); // end path

    CGContextClosePath(context); // close path

    CGContextSetLineWidth(context, 8.0); // this is set from now on until you explicitly change it

    CGContextStrokePath(context); // do actual stroking

    CGContextSetRGBFillColor(context, 0.0, 1.0, 0.0, 0.5); // green color, half transparent
    CGContextFillRect(context, CGRectMake(20.0, 250.0, 128.0, 128.0)); // a square at the bottom left-hand corner
}

Answer 1

If all you need to do is add a simple rectangular border, just do the following in your viewWillAppear: for your view controller.

- (void) viewWillAppear:(BOOL)animated
{
   //Simple border on the main view
   self.view.layer.borderColor = [UIColor redColor].CGColor;
   self.view.layer.borderWidth = 2;

   //Or a simple rectangle to place at x,h within the main view 
   UIView *test = [[UIView alloc] initWithFrame:CGRectMake(x, y, width, height)];
   test.backgroundColor = [UIColor redColor];
   [self.view addSubview:test];
}

Hope this helps!