ios改变导航条title的字体大小和颜色

//自定义标题

    UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0 , 100, 44)];

    titleLabel.backgroundColor = [UIColor clearColor];

    titleLabel.font = [UIFont systemFontOfSize:15];

    titleLabel.textColor = [UIColor darkGrayColor];//设置文本颜色

    titleLabel.textAlignment = UITextAlignmentCenter;

    titleLabel.text = @"Settings";

    self.navigationItem.titleView = titleLabel;