Call drawRect when i click on button in objective c?

How to Call drawRect when开发者_如何学JAVA i click on button in objective c ?

I want to call drawrect method of a view in my UItabbarcontroller. How i can do this ? Thanks in advance..

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Rather than calling drawRect method directly you must call -setNeedsDisplay or -setNeedsDisplayInRect: method on your view - that will force the view to redraw (so drawRect method will get called automatically).