怎样修改navigationBar的高度

http://stackoverflow.com/questions/7515230/will-apple-reject-my-app-if-i-change-the-height-of-the-navigation-bar

@implementation UINavigationBar (CustomHeight)

- (void)layoutSubviews {
  [super layoutSubviews];
  CGRect barFrame = self.frame;
  barFrame.size.height = height;
  self.frame = barFrame;
}

@end