iOS中navigationItem修改标题的颜色

UIColor * color = [UIColor redColor];
//这里我们设置的是颜色，
NSDictionary * dict = [NSDictionary dictionaryWithObject:color forKey:NSForegroundColorAttributeName];
//大功告成
self.navigationController.navigationBar.titleTextAttributes = dict;

self.navigationItem.title = @"用户注册（1/3）";