self.navigationController.navigationBar.tintColor = [UIColor grayColor];
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
forBarMetrics:UIBarMetricsDefault];
调整导航栏样式
self.navigationController.navigationBar.tintColor = [UIColor grayColor];
[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)
forBarMetrics:UIBarMetricsDefault];

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