Frame & Bounds ( Coordinate System )
Frame is about where ur view is in its super view
and the View B may Rotate , it`s bounds is 200 width by 250 high , why? (completely contain this view) . U drawn in B , u will not consider it was rotated.
and i fund that this pic could not be scaled =..=
Stroke color --
let transparentYellow = UIColor.yellowColor().colorWithAlphaComponent(0.5)
this is a instance method ?
because we use this type method yellowColor() to get an instance of a color and
we sent it this instance to get a half transparent version of yellow
and the default of the UIView is opaque = true , set it false if the transparency gonna work
Tip , if u want ur View animated to fade out ? remember the alpha
