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i'm struggling creating a drop shadow around a CALayer. For the effect i'm trying to achieve i need to have access to the "intensity" of the shadow. Somehow like the "spread" slider in Photoshop's Layer Styles. I think the "ShadowRadius" property of CALayer is equivalent to Photoshop's "Size" slider.
Any suggestions? Is maybe a radial gradient an option?
747
shadowRadius : the blur radius used to render the layer's shadow. A value of zero creates a hard-edged shadow that exactly matches the shape of the view. A larger value creates a soft-edged shadow that looks more natural. The default value of this property is 3.0 .
shadowColor sets the color of the shadow, and needs to be a CGColor . shadowOpacity sets how transparent the shadow is, where 0 is invisible and 1 is as strong as possible. shadowOffset sets how far away from the view the shadow should be, to give a 3D offset effect. shadowRadius sets how wide the shadow should be.
The layer's shadow uses several elements: shadowOffset , shadowColor , shadowOpacity , and shadowRadius . Each element changes the respective appearance. You can offset the shadow differently to change the direction the shadow is cast - how far from the layer and in which direction.
The blur radius (in points) used to render the layer's shadow.
Set the layer's shadowOffset,shadowOpacity, and shadowRadius and you should have what you are looking for. Try this for a shadow project directly "underneath" the layer with a blur of 5 pixels, which with the right color, could also make it look like a glow:
CALayer *layer = myView.layer;
layer.shadowOpacity = 0.50;
layer.shadowRadius = 5.0;
layer.shadowOffset = (CGSize){.width=0.0,.height=0.0};
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