Just wondering what would the difference be between setting the
self.view.opaque = 0
All the difference in the world. They have nothing whatever to do with each other. Neither has any effect on the other.
YES, sends a message to the drawing system about whether or not it can save some cycles by not having to composite this view with what is behind it.
backgroundColor is, uh, the color of the background. If the background color is opaque and the view's
alpha is 1, it is your duty to set
YES. It will not happen all by itself.
Big hint: I do hope you are not confusing
opaque with layer's
opacity or view's
alpha. That is yet another thing.