UITextField 起始光标位置错误 [英] UITextField starting cursor position is wrong

问题描述

我有一个带有一些预编译文本的文本字段.文本字段内的文本在视觉上是右对齐的.当我点击文本字段时，我希望光标位于文本的末尾，以便我可以准备编辑文本.默认情况下，光标位于文本的开头，如果我点击该单词，则位于该单词的末尾.

I have a textfield with some precompiled text. Text inside the textfield is visually right aligned. When I tap on the textfield I would like the cursor to be at the end of the text, so I can be ready to edit the text. By default the cursor is positioned at the start of the text or at the end of a word if I tap that word.

我尝试按照其他答案的建议设置 selectedTextRange 属性，但我无法实现结果.我注意到 becomeFirstResponder() 给出了正确的行为.

I tried to set the selectedTextRange property as suggested by other answers but I cannot manage to achieve the result. I noticed by the way that becomeFirstResponder() gives the correct behavior.

func textFieldDidBeginEditing(_ textField: UITextField) {
    textField.selectedTextRange =
        textField.textRange(from: textField.endOfDocument, to: textField.endOfDocument)
}

推荐答案

您需要始终从主线程更新您的 UI:

You need to always update your UI from the main thread:

DispatchQueue.main.async {
    textField.selectedTextRange = textField.textRange(from: textField.endOfDocument, to: textField.endOfDocument)
}

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