Android：Vertical ViewPager

时间：2012-11-20 16:38:32

标签： android android-viewpager

有没有办法让ViewPager不能水平滚动，而是垂直滚动？！

15 个答案:

答案 0 :(得分：218)

您可以使用ViewPager.PageTransformer来表示垂直ViewPager的错觉。要使用垂直拖动而不是水平拖动来实现滚动，您必须覆盖ViewPager的默认触摸事件，并在处理它们之前交换MotionEvent s的坐标，例如：

/**
 * Uses a combination of a PageTransformer and swapping X & Y coordinates
 * of touch events to create the illusion of a vertically scrolling ViewPager. 
 * 
 * Requires API 11+
 * 
 */
public class VerticalViewPager extends ViewPager {

    public VerticalViewPager(Context context) {
        super(context);
        init();
    }

    public VerticalViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        // The majority of the magic happens here
        setPageTransformer(true, new VerticalPageTransformer());
        // The easiest way to get rid of the overscroll drawing that happens on the left and right
        setOverScrollMode(OVER_SCROLL_NEVER);
    }

    private class VerticalPageTransformer implements ViewPager.PageTransformer {

        @Override
        public void transformPage(View view, float position) {

            if (position < -1) { // [-Infinity,-1)
                // This page is way off-screen to the left.
                view.setAlpha(0);

            } else if (position <= 1) { // [-1,1]
                view.setAlpha(1);

                // Counteract the default slide transition
                view.setTranslationX(view.getWidth() * -position);

                //set Y position to swipe in from top
                float yPosition = position * view.getHeight();
                view.setTranslationY(yPosition);

            } else { // (1,+Infinity]
                // This page is way off-screen to the right.
                view.setAlpha(0);
            }
        }
    }

    /**
     * Swaps the X and Y coordinates of your touch event.
     */
    private MotionEvent swapXY(MotionEvent ev) {
        float width = getWidth();
        float height = getHeight();

        float newX = (ev.getY() / height) * width;
        float newY = (ev.getX() / width) * height;

        ev.setLocation(newX, newY);

        return ev;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev){
        boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
        swapXY(ev); // return touch coordinates to original reference frame for any child views
        return intercepted;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        return super.onTouchEvent(swapXY(ev));
    }

}

当然，您可以根据需要调整这些设置。 结尾看起来像这样：

VerticalViewPager demo

答案 1 :(得分：19)

我有一个适合我的解决方案，分两步。

  1. onInstantiateItem() PagerAdapter，创建视图并按-90旋转：

    view.setRotation(-90f)

    如果您使用FragmentPagerAdapter，则：

    objFragment.getView().setRotation(-90)

  2. 将ViewPager视图旋转90度：

    objViewPager.setRotation(90)

    3. 至少在我的要求下，它就像一个魅力。

答案 2 :(得分：14)

对于正在努力使垂直ViewPager在水平方向上工作的人，只需执行以下操作：

垂直ViewPager 

public class VerticalViewPager extends ViewPager {
    public VerticalViewPager(Context context) {
        super(context);
        init();
    }

    public VerticalViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    private void init() {
        setPageTransformer(true, new VerticalPageTransformer());
        setOverScrollMode(OVER_SCROLL_NEVER);
    }

    private class VerticalPageTransformer implements ViewPager.PageTransformer {

        @Override
        public void transformPage(View view, float position) {

            if (position < -1) {
                view.setAlpha(0);
            } else if (position <= 1) {
                view.setAlpha(1);

                view.setTranslationX(view.getWidth() * -position);

                float yPosition = position * view.getHeight();
                view.setTranslationY(yPosition);
            } else {
                view.setAlpha(0);
            }
        }
    }

    private MotionEvent swapXY(MotionEvent ev) {
        float width = getWidth();
        float height = getHeight();

        float newX = (ev.getY() / height) * width;
        float newY = (ev.getX() / width) * height;

        ev.setLocation(newX, newY);

        return ev;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
        swapXY(ev);
        return intercepted;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        return super.onTouchEvent(swapXY(ev));
    }

}

水平ViewPager 

public class HorizontalViewPager extends ViewPager {
    private GestureDetector xScrollDetector;

    public HorizontalViewPager(Context context) {
        super(context);
    }

    public HorizontalViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        xScrollDetector = new GestureDetector(getContext(), new XScrollDetector());
    }

    class XScrollDetector extends GestureDetector.SimpleOnGestureListener {
        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
            return Math.abs(distanceX) > Math.abs(distanceY);
        }
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (xScrollDetector.onTouchEvent(ev)) {
            super.onInterceptTouchEvent(ev);
            return true;
        }

        return super.onInterceptTouchEvent(ev);
    }

}

答案 3 :(得分：14)

垂直ViewPager

这里的其他答案似乎都有一些问题。即使推荐的开源项目也没有将最近的拉取请求与错误修复合并。然后我发现谷歌的VerticalViewPager他们使用了一些DeskClock应用。我相信使用谷歌的实施比在这里浮动的其他答案要多得多。 （Google的版本类似于当前最高投票的答案，但更为彻底。）

完整示例

此示例与我的Basic ViewPager Example几乎完全相同，只需进行一些小的更改即可使用VerticalViewPager类。

enter image description here

XML

为主要活动和每个页面（片段）添加xml布局。请注意，我们使用VerticalViewPager而非标准ViewPager。我将在下面提供以下代码。

activity_main.xml中 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.verticalviewpager.MainActivity">

    <com.example.myapp.VerticalViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

fragment_one.xml 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent" >

    <TextView
        android:id="@+id/textview"
        android:textSize="30sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" />

</RelativeLayout>

代码

VerticalViewPager的代码不是我的代码。它只是Google源代码中的精简版（没有评论）。查看最新版本的一个。这些评论也有助于理解正在发生的事情。

VerticalViewPager.java 

import android.support.v4.view.ViewPager;    

public class VerticalViewPager extends ViewPager {

    public VerticalViewPager(Context context) {
        this(context, null);
    }

    public VerticalViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    @Override
    public boolean canScrollHorizontally(int direction) {
        return false;
    }

    @Override
    public boolean canScrollVertically(int direction) {
        return super.canScrollHorizontally(direction);
    }

    private void init() {
        setPageTransformer(true, new VerticalPageTransformer());
        setOverScrollMode(View.OVER_SCROLL_NEVER);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        final boolean toIntercept = super.onInterceptTouchEvent(flipXY(ev));
        flipXY(ev);
        return toIntercept;
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {
        final boolean toHandle = super.onTouchEvent(flipXY(ev));
        flipXY(ev);
        return toHandle;
    }

    private MotionEvent flipXY(MotionEvent ev) {
        final float width = getWidth();
        final float height = getHeight();
        final float x = (ev.getY() / height) * width;
        final float y = (ev.getX() / width) * height;
        ev.setLocation(x, y);
        return ev;
    }

    private static final class VerticalPageTransformer implements ViewPager.PageTransformer {
        @Override
        public void transformPage(View view, float position) {
            final int pageWidth = view.getWidth();
            final int pageHeight = view.getHeight();
            if (position < -1) {
                view.setAlpha(0);
            } else if (position <= 1) {
                view.setAlpha(1);
                view.setTranslationX(pageWidth * -position);
                float yPosition = position * pageHeight;
                view.setTranslationY(yPosition);
            } else {
                view.setAlpha(0);
            }
        }
    }
}

MainActivity.java

我只为VerticalViewPager换了ViewPager。

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;

public class MainActivity extends AppCompatActivity {

    static final int NUMBER_OF_PAGES = 2;

    MyAdapter mAdapter;
    VerticalViewPager mPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mAdapter = new MyAdapter(getSupportFragmentManager());
        mPager = findViewById(R.id.viewpager);
        mPager.setAdapter(mAdapter);
    }

    public static class MyAdapter extends FragmentPagerAdapter {
        public MyAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public int getCount() {
            return NUMBER_OF_PAGES;
        }

        @Override
        public Fragment getItem(int position) {

            switch (position) {
                case 0:
                    return FragmentOne.newInstance(0, Color.WHITE);
                case 1:
                    // return a different Fragment class here
                    // if you want want a completely different layout
                    return FragmentOne.newInstance(1, Color.CYAN);
                default:
                    return null;
            }
        }
    }

    public static class FragmentOne extends Fragment {

        private static final String MY_NUM_KEY = "num";
        private static final String MY_COLOR_KEY = "color";

        private int mNum;
        private int mColor;

        // You can modify the parameters to pass in whatever you want
        static FragmentOne newInstance(int num, int color) {
            FragmentOne f = new FragmentOne();
            Bundle args = new Bundle();
            args.putInt(MY_NUM_KEY, num);
            args.putInt(MY_COLOR_KEY, color);
            f.setArguments(args);
            return f;
        }

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            mNum = getArguments() != null ? getArguments().getInt(MY_NUM_KEY) : 0;
            mColor = getArguments() != null ? getArguments().getInt(MY_COLOR_KEY) : Color.BLACK;
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View v = inflater.inflate(R.layout.fragment_one, container, false);
            v.setBackgroundColor(mColor);
            TextView textView = v.findViewById(R.id.textview);
            textView.setText("Page " + mNum);
            return v;
        }
    }
}

完成

您应该可以运行该应用并在上面的动画中查看结果。

另见

答案 4 :(得分：8)

稍微延伸this回答帮助我达到了我的要求（垂直视图寻呼机动画类似Inshorts - News in 60 words中的动画）

public class VerticalViewPager extends ViewPager {

public VerticalViewPager(Context context) {
    super(context);
    init();
}

public VerticalViewPager(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
}

private void init() {
    // The majority of the magic happens here
    setPageTransformer(true, new VerticalPageTransformer());
    // The easiest way to get rid of the overscroll drawing that happens on the left and right
    setOverScrollMode(OVER_SCROLL_NEVER);
}

private class VerticalPageTransformer implements ViewPager.PageTransformer {
 private static final float MIN_SCALE = 0.75f;
    @Override
    public void transformPage(View view, float position) {

        if (position < -1) { // [-Infinity,-1)
            // This page is way off-screen to the left.
            view.setAlpha(0);

        }  else if (position <= 0) { // [-1,0]
            // Use the default slide transition when moving to the left page
            view.setAlpha(1);
            // Counteract the default slide transition
            view.setTranslationX(view.getWidth() * -position);

            //set Y position to swipe in from top
            float yPosition = position * view.getHeight();
            view.setTranslationY(yPosition);
            view.setScaleX(1);
            view.setScaleY(1);

        } else if (position <= 1) { // [0,1]
            view.setAlpha(1);

            // Counteract the default slide transition
            view.setTranslationX(view.getWidth() * -position);


            // Scale the page down (between MIN_SCALE and 1)
            float scaleFactor = MIN_SCALE
                    + (1 - MIN_SCALE) * (1 - Math.abs(position));
            view.setScaleX(scaleFactor);
            view.setScaleY(scaleFactor);

        } else { // (1,+Infinity]
            // This page is way off-screen to the right.
            view.setAlpha(0);
        }

    }

}

/**
 * Swaps the X and Y coordinates of your touch event.
 */
private MotionEvent swapXY(MotionEvent ev) {
    float width = getWidth();
    float height = getHeight();

    float newX = (ev.getY() / height) * width;
    float newY = (ev.getX() / width) * height;

    ev.setLocation(newX, newY);

    return ev;
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev){
    boolean intercepted = super.onInterceptTouchEvent(swapXY(ev));
    swapXY(ev); // return touch coordinates to original reference frame for any child views
    return intercepted;
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
    return super.onTouchEvent(swapXY(ev));
}
}

我希望这对其他人有帮助。

答案 5 :(得分：4)

有一些开源项目声称这样做。他们在这里：

这些已被作者标记为弃用：

还有一件事：

答案 6 :(得分：3)

检查出来：https://github.com/JakeWharton/Android-DirectionalViewPager

或者以下问题可能会对您有所帮助：Vertical 'Gridview with pages' or 'Viewpager'

答案 7 :(得分：3)

只是对@Brett和@Salman666的答案进行了改进，以便将坐标（X，Y）正确转换为（Y，X），因为设备显示为矩形：

... 

/**
 * Swaps the X and Y coordinates of your touch event
 */
@Override
public boolean onTouchEvent(MotionEvent ev) {
    return super.onTouchEvent(swapXY(ev));
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    return super.onInterceptTouchEvent(swapXY(ev));
}

private MotionEvent swapXY(MotionEvent ev) {

    //Get display dimensions
    float displayWidth=this.getWidth();
    float displayHeight=this.getHeight();

    //Get current touch position
    float posX=ev.getX();
    float posY=ev.getY();

    //Transform (X,Y) into (Y,X) taking display dimensions into account
    float newPosX=(posY/displayHeight)*displayWidth;
    float newPosY=(1-posX/displayWidth)*displayHeight;

    //swap the x and y coords of the touch event
    ev.setLocation(newPosX, newPosY);

    return ev;
}

...

然而，仍需要采取措施来提高触摸屏的响应能力。这个问题可能与@msdark评论@ Salman666的答案有关。

答案 8 :(得分：2)

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class VerticalViewPager extends ViewPager {

    public VerticalViewPager(Context context) {
        super(context);
        init();
    }


    public VerticalViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }
    private void init() {

        setPageTransformer(true, new VerticalPageTransformer());

        setOverScrollMode(OVER_SCROLL_NEVER);
    }

    private class VerticalPageTransformer implements PageTransformer {

        @Override
        public void transformPage(View view, float position) {
            int pageWidth = view.getWidth();
            int pageHeight = view.getHeight();

            if (position < -1) {

                view.setAlpha(0);

            } else if (position <= 1) {
                view.setAlpha(1);


                view.setTranslationX(pageWidth * -position);


                float yPosition = position * pageHeight;
                view.setTranslationY(yPosition);

            } else {

                view.setAlpha(0);
            }
        }
    }
        @Override
    public boolean onTouchEvent(MotionEvent ev) {

        ev.setLocation(ev.getY(), ev.getX());

        return super.onTouchEvent(ev);
    }
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        ev.setLocation(ev.getY(), ev.getX());
        return super.onInterceptTouchEvent(ev);
    }
}

答案 9 :(得分：0)

Android source实际上已有一个。我修改它以便更好地工作：

package com.crnlgcs.sdk.widgets;



import android.content.Context;
import android.support.v4.view.ViewConfigurationCompat;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewParent;

public class VerticalViewPager extends ViewPager {
    private static final String TAG = "VerticalViewPager";
    private static final boolean DEBUG = true;

    private float mLastMotionX;
    private float mLastMotionY;
    private float mTouchSlop;
    private boolean mVerticalDrag;
    private boolean mHorizontalDrag;

    // Vertical transit page transformer
    private final ViewPager.PageTransformer mPageTransformer = new ViewPager.PageTransformer() {
        @Override
        public void transformPage(View view, float position) {
            final int pageWidth = view.getWidth();
            final int pageHeight = view.getHeight();
            if (position < -1) {
                // This page is way off-screen to the left.
                view.setAlpha(0);
            } else if (position <= 1) {
                view.setAlpha(1);
                // Counteract the default slide transition
                view.setTranslationX(pageWidth * -position);
                // set Y position to swipe in from top
                float yPosition = position * pageHeight;
                view.setTranslationY(yPosition);
            } else {
                // This page is way off-screen to the right.
                view.setAlpha(0);
            }
        }
    };

    public VerticalViewPager(Context context) {
        super(context, null);
    }

    public VerticalViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        final ViewConfiguration configuration = ViewConfiguration.get(context);
        mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(configuration);
        init();
    }

    private void init() {
        // Make page transit vertical
        setPageTransformer(true, mPageTransformer);
        // Get rid of the overscroll drawing that happens on the left and right (the ripple)
        setOverScrollMode(View.OVER_SCROLL_NEVER);
    }

    @Override
    public boolean onTouchEvent(MotionEvent ev) {

        final float x = ev.getX();
        final float y = ev.getY();

        if (DEBUG) Log.v(TAG, "onTouchEvent " + x + ", " + y);

        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN: {
                mLastMotionX = x;
                mLastMotionY = y;
                if (!super.onTouchEvent(ev))
                    return false;
                return verticalDrag(ev);
            }
            case MotionEvent.ACTION_MOVE: {
                final float xDiff = Math.abs(x - mLastMotionX);
                final float yDiff = Math.abs(y - mLastMotionY);
                if (!mHorizontalDrag && !mVerticalDrag) {
                    if (xDiff > mTouchSlop && xDiff > yDiff) { // Swiping left and right
                        mHorizontalDrag = true;
                    } else if (yDiff > mTouchSlop && yDiff > xDiff) { //Swiping up and down
                        mVerticalDrag = true;
                    }
                }
                if (mHorizontalDrag) {
                    return super.onTouchEvent(ev);
                } else if (mVerticalDrag) {
                    return verticalDrag(ev);
                }
            }
            case MotionEvent.ACTION_UP: {
                if (mHorizontalDrag) {
                    mHorizontalDrag = false;
                    return super.onTouchEvent(ev);
                }
                if (mVerticalDrag) {
                    mVerticalDrag = false;
                    return verticalDrag(ev);
                }
            }
        }
        // Set both flags to false in case user lifted finger in the parent view pager
        mHorizontalDrag = false;
        mVerticalDrag = false;

        return false;
    }


    private boolean verticalDrag(MotionEvent ev) {
        final float x = ev.getX();
        final float y = ev.getY();
        ev.setLocation(y, x);
        return super.onTouchEvent(ev);
    }
}

答案 10 :(得分：0)

当前更活跃的存储库是lsjwzh/RecyclerViewPager。

  • 最后一次提交2016年8月12日，16位贡献者，1840位明星
  • 基于RecyclerView

答案 11 :(得分：0)

这是一个垂直可滚动的ViewPager implementation.Works与RecyclerView和ListView。 guochong/VerticalViewPager

使用ViewPager.PageTransformer使ViewPager垂直滚动，并提供View.OnTouchListener来处理滚动冲突。

/**
 * 1.dispatch ACTION_DOWN,ACTION_UP,ACTION_CANCEL to child<br>
 * 2.hack ACTION_MOVE
 *
 * @param v
 * @param e
 * @return
 */
@Override
public boolean onTouch(View v, MotionEvent e) {
    Log.i(TAG, "onTouchEvent " + ", action " + e.getAction() + ", e.rawY " + e.getRawY() + ",lastMotionY " + lastMotionY + ",downY " + downY);
    switch (e.getAction()) {
        case MotionEvent.ACTION_DOWN:
            downY = e.getRawY();
            break;
        case MotionEvent.ACTION_MOVE:

            if (downY == Float.MIN_VALUE && lastMotionY == Float.MIN_VALUE) {
                //not start from MOTION_DOWN, the child dispatch this first motion
                downY = e.getRawY();
                break;
            }

            float diff = e.getRawY() - (lastMotionY == Float.MIN_VALUE ? downY : lastMotionY);
            lastMotionY = e.getRawY();
            diff = diff / 2; //slow down viewpager scroll
            Log.e(TAG, "scrollX " + dummyViewPager.getScrollX() + ",basescrollX " + dummyViewPager.getBaseScrollX());

            if (dummyViewPager.getScrollX() != dummyViewPager.getBaseScrollX()) {
                if (fakeDragVp(v, e, diff)) return true;
            } else {
                if (ViewCompat.canScrollVertically(v, (-diff) > 0 ? 1 : -1)) {
                    Log.e(TAG, "scroll vertically  " + diff + ", move.lastMotionY " + e.getY());
                    break;
                } else {
                    dummyViewPager.beginFakeDrag();
                    fakeDragVp(v, e, diff);
                    adjustDownMotion(v, e);
                    return true;
                }
            }

            break;
        case MotionEvent.ACTION_UP:
        case MotionEvent.ACTION_CANCEL:
            if (dummyViewPager.isFakeDragging()) {
                try {
                    dummyViewPager.endFakeDrag();
                } catch (Exception e1) {
                    Log.e(TAG, "", e1);
                }
            }
            reset();
            break;
    }

    return false;
}

答案 12 :(得分：0)

即使我通过交换X和Y使ViewPager垂直也面临同样的问题。它一点也不顺利。

那是因为它曾经只在滑动角度小于7.125度时工作= arctan（1/8）而拦截时14度= arctan（1/4）触摸时;当原始ViewPager水平一个工作时，滑动角度小于26.565度= arctan（1/2），而拦截和45度= arctan（1）触摸时。

这就是为什么我复制Android support-core-ui的代码并将值移动到变量，我用反射将其乘以。

请在https://github.com/deepakmishra/verticalviewpager找到代码和自述文件 和https://github.com/deepakmishra/verticalviewpager/blob/master/app/src/main/java/com/viewpager/VerticalViewPager.java

上的VerticalViewPager

答案 13 :(得分：0)

更好的方法是将viewpager旋转90度，然后使用constraintLayout调整位置。

答案 14 :(得分：0)

我最终创建了一个新的DirectionalViewPager，它可以垂直或水平滚动，因为我在这里看到的所有解决方案都有缺陷：

  1. 现有的VerticalViewPager实现（通过castorflex和LambergaR实现）

    • 它们基于非常老的支持库版本。

  2. 带有坐标交换的变换技巧

    • 过卷轴仍从左/右边缘显示。
    • 页面翻转无法正常工作，因为即使交换了坐标，VelocityTracker.computeCurrentVelocity仍会计算X轴的速度，可能是因为它内部使用了忽略坐标交换的本机调用。

  3. 查看旋转

    • Hack也需要旋转每个子视图。
    • 如果要读取其他坐标，则必须交换轴。
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