自定义键盘设置光标位置 [英] Custom Keyboard Set Cursor Position

问题描述

我有一个文本字段点击，其中显示包含数字0-9和退格按钮的自定义键盘。我能够删除文本末尾以及字符串中间的文本。但是当我从中间某处删除文本时，光标会跳到结束位置。我希望光标在删除文本时保持在同一位置。
请尽快回复并提前致谢。

I have a text field tapping on which a custom keyboard appears containing numbers 0-9 and a backspace button. I'm able to delete text at the end as well as from middle of string. But when i delete text from somewhere middle, the cursor jumps to end position. I want cursor to remain at same position where it was while deleting text. Please reply ASAP and thanks in advance.

推荐答案

首先获取光标的初始位置（或结束所选范围）：

First get the initial position of the cursor (or the end of the selected range):

UITextRange *selectedRange = [textField selectedTextRange];
NSInteger offset = [textField offsetFromPosition:textField.endOfDocument toPosition:selectedRange.end];

修改textField的文本后，使用UITextPosition重置光标位置，如下所示：

After modifying the textField's text, reset the cursor position by using UITextPosition as follows:

UITextPosition *newPos = [textField positionFromPosition:textField.endOfDocument offset:offset];
textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];

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