我怎样才能解决被分解为角色的表情符号？-HowcanIworkaroundtheemojibeingbrokenupintocharacters?

In my iOS keyboard extension, I have a function that moves the cursor backwards as follows:

在我的iOS键盘扩展中,我有一个向下移动光标的功能,如下所示:

(textDocumentProxy).adjustTextPositionByCharacterOffset(-1)

and displays the words right before the cursor in a UILabel using the textDocumentProxy.documentContextBeforeInput function provided by Apple. The problem is, whenever an emoji appears inside the label, it starts being separated as such:

并使用Apple提供的textDocumentProxy.documentContextBeforeInput函数在UILabel中显示光标前的单词。问题是,只要表情符号出现在标签内部,它就会开始分离:

Is there any way of avoiding this? Does it have anything to do with me hardcoding the -1? I've tried using str.utf16.countbut that just doesn't scroll at all for some reason. Any help would be greatly appreciated.

有没有办法避免这种情况?这与我硬编码-1有什么关系吗?我已经尝试过使用str.utf16.count但由于某种原因根本不滚动。任何帮助将不胜感激。

Here's my question from a few months ago that never got answered

这是我几个月前的问题,从来没有得到答案

1 个解决方案

func moveCursorBy(offset: Int, onProxy proxy: UITextDocumentProxy){
    var realOffset = 0
    if offset <0, let text = proxy.documentContextBeforeInput {
        for uni in text.unicodeScalars.reverse().prefix(abs(offset)){
            realOffset -= uni.value > 0xFFFF ? 2 : 1
        }
    }
    else if offset > 0, let text = proxy.documentContextAfterInput{
        for uni in text.unicodeScalars.prefix(abs(offset)) {
            realOffset += uni.value > 0xFFFF ? 2 : 1
        }
    }
    else{
        realOffset = offset
    }
    proxy.adjustTextPositionByCharacterOffset(realOffset)
}