ios - 在这个非常基本的 UIScrollView 中我做错了什么

Question

我试图让这个非常基本的 UIScrollView 水平滚动而不是垂直滚动。我在 Xamarin 开发人员网站上关注此示例:https://developer.xamarin.com/recipes/ios/content_controls/scroll_view/create_a_horizontal_scrolling_button_list/但是我无法让按钮占据整个 ScrollView 并且只能水平滚动。我一直在按钮列表的顶部和底部出现奇怪的填充。这是我的整个类(class):

public partial class StackViewController : UIViewController
{        
    public StackViewController()
    {            
    }

    public override void DidReceiveMemoryWarning()
    {
        base.DidReceiveMemoryWarning();
    }

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();

        this.View.BackgroundColor = UIColor.White;            

        nfloat h = 50.0f;
        nfloat w = 50.0f;
        nint n = 25;
        UIScrollView scrollView = new UIScrollView
        {
            Frame = new CGRect(0, 100, View.Frame.Width, 100),
            ContentSize = new CGSize((w) * n, h),
            BackgroundColor = UIColor.Green
        };
        for (int i = 0; i < n; i++)
        {                
            var button = new UIButton();
            button.SetTitle(i.ToString(), UIControlState.Normal);
            button.Frame = new CGRect((i * w), 0, w, h);
            button.BackgroundColor = UIColor.Blue;                
            scrollView.AddSubview(button);                
        }
        View.AddSubview(scrollView);
    }
}

不知何故，我遗漏了一些我不知道的填充或布局属性。我是 Xamarin ios 开发的半新手，我知道我缺少一些简单的东西。

Answer 1

UIScrollviews 通常可以添加指示符插入和内容插入。我建议做的是覆盖“ViewDidLayoutSubviews”方法并放入以下代码:

public override void ViewDidLayoutSubviews()
{
     base.ViewDidLayoutSubviews();

     scrollView.ContentInset = UIEdgeInsets.Zero;
     scrollView.ScrollIndicatorInsets = UIEdgeInsets.Zero;
}