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iOS UIScrollView可在Xamarin.iOS中第二次打开视图时滚动

cirrious.fluentlayout xamarin.ios xamarin ios

Dominik Roszkowski · 技术社区 · 7 年前

FluentLayout 和MvvmCross 6.0.1。

View (controller)
 - UIScrollView
   - UIView
      - UIView,
      - UIView/UILabel etc.
      - UIView/UILabel etc.
      - ...

控制器位于MvxBaseViewController内部,即控制器的结构如下:

- DashBoard (MvxTabBarViewController, WrapInNavigationController=true)
  - Tab1 (MvxBaseViewController)
  - Tab2 (MvxBaseViewController)
  - Tab3 (MvxBaseViewController)
    - The problematic view (MvxBaseViewController)

我在跟踪 this guide 在设置以下约束时:

var innerView = new UIView();
innerView.AddSubview(view1);
innerView.AddSubview(view2);
innerView.AddSubview(view3);

innerView.SubviewsDoNotTranslateAutoresizingMaskIntoConstraints();
innerView.AddConstraints(
    view1.AtTopOf(innerView).Plus(21.0f),
    view1.WithSameCenterX(innerView),
    view1.WithSameWidth(innerView).WithMultiplier(0.8f),
    view1.Height().EqualTo(44f),
    view2.Below(view1).Plus(10.0f),
    view2.WithSameCenterX(innerView),
    view2.WithSameWidth(innerView).WithMultiplier(0.9f),
    view2.Height().EqualTo(16.0f),
    view3.Below(view2).Plus(21.0f),
    view3.WithSameCenterX(innerView),
    view3.WithSameWidth(innerView).WithMultiplier(0.9f),
    view3.Height().EqualTo(40.0f),
);

var scrollView = new UIScrollView();
scrollView.ShowsHorizontalScrollIndicator = false;
scrollView.AddSubview(innerView);

scrollView.SubviewsDoNotTranslateAutoresizingMaskIntoConstraints();
scrollView.AddConstraints(
    innerView.AtTopOf(scrollView, 0),
    innerView.AtBottomOf(scrollView, 0),
    innerView.AtLeadingOf(scrollView, 0),
    innerView.AtTrailingOf(scrollView, 0)
);

//scrollView.DirectionalLockEnabled = true;
View.AddSubview(scrollView);

View.SubviewsDoNotTranslateAutoresizingMaskIntoConstraints();
View.AddConstraints(
    //scrollView.WithSameWidth(View),
    //scrollView.WithSameHeight(View),
    innerView.WithSameWidth(View),
    innerView.WithSameHeight(View).SetPriority(250),
    scrollView.AtTopOf(View, 0),
    scrollView.AtBottomOf(View, 0),
    scrollView.AtLeadingOf(View, 0),
    scrollView.AtTrailingOf(View, 0)
);

我怀疑问题与约束有关,但我无法找出问题所在。你有什么办法解决这个问题吗?

1 回复 | 直到 7 年前

Dominik Roszkowski 7 年前

所以我花了一些时间在这个话题上,找不到合适的方法来限制我的观点。我尝试在xib中实现这个布局,但是在代码中重新实现自动生成的约束没有帮助。

内视图 滚动视图 . 然后在 ViewDidAppear() ContentSize 垂直方向的滚动视图。

scrollView = new UIScrollView();

scrollView.AddSubviews(view1,
                       view2,
                       view3);
scrollView.ShowsHorizontalScrollIndicator = false;
scrollView.SubviewsDoNotTranslateAutoresizingMaskIntoConstraints();

scrollView.AddConstraints(
    view1.AtTopOf(scrollView).Plus(21.0f),
    view1.WithSameCenterX(scrollView),
    view1.WithSameWidth(scrollView).WithMultiplier(0.8f),
    view1.Height().EqualTo(44f),

    view2.Below(view1).Plus(10.0f),
    view2.WithSameCenterX(scrollView),
    view2.WithSameWidth(scrollView).WithMultiplier(0.9f),
    view2.Height().EqualTo(16.0f),

    view3.Below(view2).Plus(21.0f),
    view3.WithSameCenterX(scrollView),
    view3.WithSameWidth(scrollView).WithMultiplier(0.9f),
    view3.Height().EqualTo(40.0f)
);

View.AddSubview(scrollView);
View.SubviewsDoNotTranslateAutoresizingMaskIntoConstraints();

View.AddConstraints(
    scrollView.AtTopOf(View, 0),
    scrollView.AtBottomOf(View, 0),
    scrollView.AtLeadingOf(View, 0),
    scrollView.AtTrailingOf(View, 0),
    scrollView.WithSameCenterX(View),
    scrollView.WithSameCenterY(View)
);

在视图中出现:

scrollView.ContentSize = new CGSize(View.Bounds.Width, scrollView.Bounds.Height + 300);