UIView下的阴影被切断

Question

I'm trying to add some shadow under a UIView.

In drawRect I created a rounded rectangle bezier path and appended a curved arrow-like bottom part to it (blue stuff)

Here is the shadow's code :

...
    CGContextSaveGState(context);
        CGContextAddPath(context, rectPath.CGPath);  // rectPath is the bezier
        CGContextSetShadowWithColor(context,shadowSize, 3.0, [[[UIColor blackColor]  colorWithAlphaComponent:0.7]CGColor]);    
        CGContextFillPath(context);
    CGContextRestoreGState(context);
...

As you can see, the shadow is cut off at the bottom, that's where the view's frame ends. Can I extend the shadow "outside" the frame ?

Answer 1

use the CALayer shadow properties instead of drawing the shadow in drawRect:

• shadowOpacity
• shadowRadius
• shadowOffset
• shadowColor
• shadowPath

this can result in some performance issues, which you can reduce by using the shadowPath property.