self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
// self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:uibar target:self action:@""];
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStyleDone target:self action:nil];
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