iOS Performance tips (I): Drawing shadows

Shadow paths are the best way to go if your shadows are simple enough to be defined with a polygon. However, you will have the extra work of setting your path ...

You can use a layer's shadow path to create special effects such as simulating the shadows available in Pages. The following code shows the code required to add ...

You should expect a slowdown from adding a shadow. A shadowRadius of 20 is very high and will be especially slow.

Setting a shadowPath allows iOS to not recalculate how it should draw the shadow every time it draws the view, thus improving performance. In ...

It's very easy to add drop shadows to your views in iOS. What's not so easy is making sure that they have good performance.

Summary. If you want to use shadows on your views then you should probably also set the shadowPath on your view to ensure proper performance.

Shows several drop shadow approaches, with an eye towards performance, particularly while the shadow casting object's frame is being animated.

Setting shadows on the iOS UI elements can be done very easily. There are a few properties in layer support of UI elements that can be used. Learn more.

Speaker: Pradnya Nikam Drawing shadows are expensive Is this because of the rendering engine? Wait, what does the rendering engine do?

There are two different uses for the shadowPath property on CALayer : Improving the performance of having a shadow; Creating shadows that don't ...