On Apr 8, 2010, at 6:44 AM, john chen wrote: > I think UIButton is not designed for subclassing.
That was my hunch as well. > You can try > composition, or create UIButton category method for custom-build > button. Apple has sample code in UICatalog to create custom-build > button. A category on UIButton won't work for me because I need to add extra state to the custom button. The best alternative I've come up with is to have a custom UIView object that contains a UIButton instance and which hijacks touch events by overriding -hitTest:withEvent: to return self. Once the swiping and reordering (as in the Autoscroll sample code) have been dealt with, this "proxy" UIView instance can decide if/when to forward a tap gesture to the button. So, yes, composition seems to be the way to go here. > On Wed, Apr 7, 2010 at 2:26 PM, WT wrote: >> Hello all, >> >> I need to create a custom bar of UIButton instances which can be scrolled >> left and right using a swipe gesture. I am thus following the "Autoscroll" >> sample code from Apple, which subclasses UIImageView to produce a scrollable >> bar of thumbnail images. My problem is how to correctly subclass UIButton, >> since the only available means of instantiating a button is through the >> class method +buttonWithType:. >> >> Once I allocate an instance of the subclass, how do I initialize it with the >> desired type? The buttonType property is read-only and there is no instance >> method -initWithType: in the public API. >> >> One alternative I see is to use composition rather than subclassing, >> essentially creating a decorator for UIButton, but I'd rather not have to do >> that. >> >> Another option is to fake a button using UIImageView, just like the >> "Autoscroll" example does, but I'd prefer to have actual UIButton instances. >> >> Am I missing something trivial here? If UIButton was designed in such a way >> to prevent subclassing, what would you suggest as the best alternative? >> >> Thanks in advance. >> WT. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
