I have a subclass of UIImageView, MySubView, which is instantiated
and added as a subview in the viewDidLoad method of a
UIViewController. MySubView displays a picture without difficulty
when its image property is set in its initWithFrame method. But its
drawRect method is never called. (I put an NSLog call inside it to
check.) I've tried sending MySubView setNeedsDisplay messages from
all kinds of places, to no avail.
I suspect I'm missing something very simple. Any advice would be
appreciated.
There are 2 ways to get content into a layer without subclassing. The
first is the delegate method, which in UIKit eventually leads to a -
drawRect: call. The other is to set the contents of the layer. Since
your not getting a -drawRect: call, I would suspect that the
UIImageView sets the contents of its layer rather than calling -
drawRect: (which would make sense since it would be better performance
than using the -drawRect: method).
Could you explain what you are trying to do? There may be a better
solution than "implement your own UIView subclass" here, but without
more information its hard to know...
--
David Duncan
Apple DTS Animation and Printing
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