iphone - setUserInteractionEnabled problem

I have a pa开发者_高级运维rent view contain a child custom view and many buttons. When I click on a button, it shows a child view and set [parentView setUserInteractionEnabled:NO]. Then I set [childView setUserInteractionEnabled:YES]. But it's not working, the child view isnot able to be enabled. I don't why. Please help me.

Thanks

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 [parentView setUserInteractionEnabled:NO];

The snippet above disables user interaction for the parentView and all its subviews. So even if you follow it up with,

 [childView setUserInteractionEnabled:YES];

it won't work. You might want to rethink disabling user interaction on the parent view or do not add the childView as its subview.