THCameraButton.m drawRect method. Custom drawn camera button, iOS 7 default camera button look-alike.

03. THCameraButton drawRect

#define DegreesToRadians(x) ((x) * M_PI / 180.0)

- (void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    CGMutablePathRef path = CGPathCreateMutable();
    
    CGFloat buttonRadius = rect.size.width/2;
    CGFloat buttonRing = buttonRadius - (buttonRadius/5.5);
    CGFloat buttonFill = buttonRing - (buttonRadius/12);
    
    CGPathAddArc(path, NULL, buttonRadius, buttonRadius, buttonRadius - 2, DegreesToRadians(0), DegreesToRadians(360), 0);
    CGPathMoveToPoint(path, NULL, buttonRadius, buttonRadius);
    CGPathAddArc(path, NULL, buttonRadius, buttonRadius, buttonRing, DegreesToRadians(0), DegreesToRadians(360), 0);
    CGPathMoveToPoint(path, NULL, buttonRadius, buttonRadius);
    CGPathAddArc(path, NULL, buttonRadius, buttonRadius, buttonFill, DegreesToRadians(0), DegreesToRadians(360), 0);
    CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);
    
    CGContextAddPath(context, path);
    CGContextEOFillPath(context);
    CGPathRelease(path);
    
    UIGraphicsEndImageContext();
}

Draws a resizable button identical to the iOS7 Default Camera Button using EOFillPath CGContext method