//按钮的颜色
[self.navigationBar setTintColor:[UIColor whiteColor]];
//标题颜色
[self.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor],NSFontAttributeName:[UIFont systemFontOfSize:16]}];
//背景颜色
self.navigationBar.barTintColor = [UIcolor redColor];
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