On May 19, 2011, at 11:22, Gustavo Pizano wrote:

> Why will it be a bug?, a fade-in animation goes form 0 to 1 alpha, so at the 
> start point the alpha value must 0 no?

What actually happens in Snow Leopard (IIRC -- it was a few weeks ago that I 
was using NSViewAnimation) is that the view fades in normally, but at the end 
of animation it vanishes again because it's still officially hidden. So, the 
fade-in animation works, but it just doesn't "stick" at the end. You can google 
the 'NSViewAnimationFadeInEffect' effects key if you want to read more about it.

The *technical* answer to the OP's question is easily findable by googling. 
However, in this case, the fault is really Apple's. It's hard to know that 
NSViewAnimation even exists, starting from any obvious place, such as the 
NSView documentation. The OP and the people who responded can't really be 
blamed for not realizing there are two intermediate APIs -- NSViewAnimation and 
NSAnimation -- between the obvious extremes that *are* well-pointed-to in the 
documentation -- [NSView animator] and layers.

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