Question

Here is my drawRect:

- (void)drawRect:(CGRect)rect
{
    CGContextFillEllipseInRect(UIGraphicsGetCurrentContext(), self.bounds);
}

and the instances of this class are added a subviews the next way:

(#define DOTS_SIZE 30)

[self addSubview:[[VertexView alloc] initWithFrame:CGRectMake(anchor.x-DOTS_SIZE/2, anchor.y-DOTS_SIZE/2, DOTS_SIZE, DOTS_SIZE)]];

As far as I understand, I should get and ellipse (circle my case) in the views bounds. But I get it fully filled with rectangle (square).

By the way, I have logged bounds and their size is 30×30, so I should get nice little circles, but I get squares (T_T)

I’ll be thankful for any advise!

Answer 1

The problem is that you have to make some setup before drawing the ellipse. For example:

- (void)drawRect:(CGRect)rect
{
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(ctx, [UIColor redColor].CGColor); // Or any other color.
    CGContextFillEllipseInRect(ctx, self.bounds);
}

And to make background transparent you can check out: Setting A CGContext Transparent Background