改变navigationbar 颜色

    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7){
        self.navigationController.navigationBar.barTintColor = [UIColor redColor];
    }
    self.navigationController.navigationBar.tintColor = [UIColor redColor];

原文：http://www.cnblogs.com/xiezefeng/p/4990887.html