NSMutableAttributedString:如何在 iOS 上以编程方式删除最后一个字符? [英] NSMutableAttributedString: How to delete last character programmatically on iOS?

问题描述

我有一个自定义键盘，我必须对具有 nsmutableattributed 字符串作为文本(字符和 nstextattachments 的组合)的 textview 执行退格操作

I have a custom keyboard and I have to perform backspace action on textview having nsmutableattributed string as a text (combination of character and nstextattachments)

推荐答案

根据 Moxy:如果您的最后一个字符大到无法容纳在单个 UTF-16 单元中，那么 Dave 的方法将只是截断该字符的描述.表情符号就是一个例子 但还有更多.

As per Moxy: if your last character is large enough not to fit within a single UTF-16 unit then Dave's method will just truncate the description of that character. Emojis are an example but there are a bunch more.

所以你更有可能想要:

[string deleteCharactersInRange:
    [string.string rangeOfComposedCharacterSequenceAtIndex:string.length - 1]]

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