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-(void)viewWillAppear:(BOOL)animated{
[self.navigationController setNavigationBarHidden:NO animated:NO];
}
-(void)viewWillDisappear:(BOOL)animated{
[self.navigationController setNavigationBarHidden:YES animated:YES];
}
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原文地址：http://www.cnblogs.com/xiezefeng/p/5583655.html
