ios 导航栏透明
[[UINavigationBar appearance] setBackIndicatorImage:[UIImage imageNamed:@"back"]];
[[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@"back"]];
self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
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感谢分享ios技术～我正在学习呢。