iOS 7 导航栏颜色设定与适配

iOS7 设置navigationBar的颜色，新增了一个属性 barTintColor

    CGFloat osVersion = [[UIDevice currentDevice].systemVersion floatValue];
    if (osVersion >= 7.0) {
        rootNa.navigationBar.barTintColor = [UIColor redColor];
    }
    else
    {
        rootNa.navigationBar.tintColor = [UIColor redColor];

    }