如何在Xamarin iOS中键入时处理UITextField位置？

Question

它是iOS移动开发中非常常见的问题，当你完成UI并且它包含太多的UITextField时，如果你试图在UITextFields中输入值，那么它们会被添加到屏幕的中心底部;这些字段隐藏在键盘后面。我们怎样才能摆脱这个普遍的问题？

Answer 1

当键盘可见并隐藏时，您可以在NSNotificationCenter中使用AddObserver方法。

示例代码（仅供参考：去年某个时间从其他帖子获得以下代码，我无法记住该帖子的链接，但效果很好。）

在viewdidload方法中调用AddObserver

//键盘弹出NSNotificationCenter.DefaultCenter.AddObserver（UIKeyboard.DidShowNotification，KeyBoardUpNotification）;

//键盘向下NSNotificationCenter.DefaultCenter.AddObserver（UIKeyboard.WillHideNotification，KeyBoardDownNotification）;

如果您有一个

，可以在基本控制器库中添加以下方法

 public void KeyBoardUpNotification(NSNotification notification) {
            CGRect keyboardSize = UIKeyboard.BoundsFromNotification(notification);

            // Find what opened the keyboard
            foreach (UIView view in this.View.Subviews) {
                if (view.IsFirstResponder)
                    activeview = view;
            }

            bottom = (activeview.Frame.Y + activeview.Frame.Height + offset);
            scrollamount = (keyboardSize.Height - (View.Frame.Size.Height - bottom));

            if (scrollamount > 0) {
                moveViewUp = true;
                MoveView(moveViewUp);
            } else {
                moveViewUp = false;
            }

        }

     public void KeyBoardDownNotification(NSNotification notification) {
                if (moveViewUp) {
                    MoveView(false);
                }
            }

private void MoveView(bool move) {
            UIView.BeginAnimations(string.Empty, IntPtr.Zero);
            UIView.SetAnimationDuration(0.3);
            CGRect frame = View.Frame;

            if (move) {
                frame.Y -= scrollamount;
            } else {
                frame.Y += scrollamount;
                scrollamount = 0;
            }

            View.Frame = frame;
            UIView.CommitAnimations();
        }

Answer 2

我使用nuget包解决了这个问题。我已经覆盖了两个方法并在这些方法中初始化了代码。

下载KeyboardHandler并使用以下内容：

using KeyboardHandler;


public override void ViewWillAppear(bool animated)
{
  base.ViewWillAppear(animated);
  this.yourScrollView.SubscribeKeyboardManaqger();
}

public override void ViewWillDisappear(bool animated)
{
  base.ViewWillDisappear(animated);
  this.yourScrollView.UnsubscribeKeyboardManaqger();
}