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ios - UIBarButtonItem: How can I find its frame?

I have a button in a toolbar. How can I grab its frame? Do UIBarButtonItems not have a frame property?

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Try this one;

UIBarButtonItem *item = ... ;
UIView *view = [item valueForKey:@"view"];
CGFloat width;
if(view){
    width=[view frame].size.width;
}
else{
    width=(CGFloat)0.0 ;
}

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