iOS实现底部弹出PopupWindow效果iOS改变背景透明效果

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/** 弹出底部对话框 */
public void openPop(View view) {
  View popView = LayoutInflater.from(mContext).inflate(
      R.layout.pop_bottom, null);
  View rootView = findViewById(R.id.root_main); // 當前頁面的根佈局
  final PopupWindow popupWindow = new PopupWindow(popView,    LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);

  setBackgroundAlpha(0.5f);//设置屏幕透明度

  popupWindow.setBackgroundDrawable(new BitmapDrawable());
  popupWindow.setFocusable(true);// 点击空白处时，隐藏掉pop窗口
  // 顯示在根佈局的底部
  popupWindow.showAtLocation(rootView, Gravity.BOTTOM | Gravity.LEFT, 0,
      0);

}

popupWindow.setOnDismissListener(new OnDismissListener() {
      @Override
      public void onDismiss() {
        // popupWindow隐藏时恢复屏幕正常透明度
        setBackgroundAlpha(1.0f);
      }
    });

/**
 * 设置添加屏幕的背景透明度
 * 
 * @param bgAlpha
 *      屏幕透明度0.0-1.0 1表示完全不透明
 */
public void setBackgroundAlpha(float bgAlpha) {
  WindowManager.LayoutParams lp = ((Activity) mContext).getWindow()
      .getAttributes();
  lp.alpha = bgAlpha;
  ((Activity) mContext).getWindow().setAttributes(lp);
}

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/**
 * 弹出底部对话框，达到背景背景透明效果
 * 
 * 实现原理：弹出一个全屏popupWindow,将Gravity属性设置bottom,根背景设置为一个半透明的颜色，
 * 弹出时popupWindow的半透明效果背景覆盖了在Activity之上 给人感觉上是popupWindow弹出后，背景变成半透明
 */
public void openPop2(View view) {
  View popView = LayoutInflater.from(mContext).inflate(
      R.layout.pop_bottom_alpha, null);
  View rootView = findViewById(R.id.root_main); // 當前頁面的根佈局
  final PopupWindow popupWindow = new PopupWindow(popView,
      LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);

  // 设置弹出动画
  popupWindow.setAnimationStyle(R.style.AnimationFadeBottom);
  popupWindow.setBackgroundDrawable(new BitmapDrawable());
  // 顯示在根佈局的底部
  popupWindow.showAtLocation(rootView, Gravity.BOTTOM | Gravity.LEFT, 0,
      0);
}