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[[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc] init] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];//设置背景
[[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]]; //覆盖边框阴影
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原文地址:http://www.cnblogs.com/xuzhongnang/p/4218435.html