setNeedsDisplay not being called in view

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I am changing the amount a bezier oval is being changed by each time the user presses a button. However, draw rect is only called once and when I call the method [self setNeedsDisplay], nothing happens. Is there a different way I should be approaching this?

Here is my code:

   #import "CustomView.h"

@implementation CustomView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

-(void)awakeFromNib{
    [self setup];
}

-(void)setup{
    _scaleFactor = 0;
}


// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    UIBezierPath * circle = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0,0, self.bounds.size.width - _scaleFactor, self.bounds.size.height - _scaleFactor)];
    [[UIColor redColor]setStroke];
    [[UIColor redColor]setFill];
    [circle stroke];
    [circle fill];
}

-(void)makeSmaller{
    _scaleFactor -= 10;
    [self setNeedsDisplay];
}

@end

asked 21 secs ago

user2950916

1