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Swift:
navigationController?.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .Default) navigationController?.navigationBar.shadowImage = UIImage()
OC:
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault]; [self.navigationController.navigationBar setShadowImage:[[UIImage alloc] init]];
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原文地址:http://www.cnblogs.com/Rinpe/p/5603119.html