- (void)viewDidLoad
{
    [super viewDidLoad];
    if ([self respondsToSelector:@selector(edgesForExtendedLayout)])
    {
        self.edgesForExtendedLayout = UIRectEdgeNone;
        self.navigationController.navigationBar.translucent=YES;
    }

    // Do any additional setup after loading the view.
}

我不希望我的scrollView默认位于navigationBar的后面.所以我设置了self.edgesForExtendedLayout = UIRectEdgeNone;.

那个viewDidLoad是我所有viewController的母viewDidLoad.

没关系.但我喜欢半透明的效果.

当我将self.edgesForExtendedLayout设置为none时,似乎半透明效果消失了.

如何将其设置为无,仍然具有半透明效果.

我认为一个好的解决方案是安排scrollview的插图.

我做到了

- (void)viewDidLoad
{
    [super viewDidLoad];
    if ([self respondsToSelector:@selector(edgesForExtendedLayout)])
    {
        //self.edgesForExtendedLayout = UIRectEdgeNone;
        self.navigationController.navigationBar.translucent=YES;
        self.automaticallyAdjustsScrollViewInsets = YES;
    }

    // Do any additional setup after loading the view.
}

这就是我得到的：