Can we animate "shadowOpacity" using UIView animation block?
We are pretty much used to the UIView animation block for properties like frame and transforms. + ( void )animateWithDuration:( NSTimeInterval )duration animations:( void (^)( void ))animations Lets say there is a UIView *userView and you would like to show animation of shadow turned on or off. [ UIView animateWithDuration :01 animations :^{ if (showShadow){ self.userView. layer . shadowOpacity =0.5; } else { self.userView. layer . shadowOpacity =0.0; } }]; The above code is not going to work. UIView animates frame, bounds, center, tranform, alpha, background Color and contentStretch.i.e simple animation. The View Programming guide - Animations url gives more details on it. It does not animate layer properties. So , we will have to use CABasicAnimation. The following code will work perfectly fine. float start=0.5,end=0.0;//example CABasicAnimation *ani