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UITextField：前导截断

发布于 2025-01-13 09:24:51 字数 83 浏览 0 评论 0原文

目前，我在 UITextField 中的文本在尾部被截断（例如“Hello，Wor...”）。我希望从前缘截断文本（例如“...lo，World！”）。

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相对绾红妆 2025-01-20 09:24:51

您只需更新文本属性（例如 defaultTextAttributes）与 .paragraphStyle 与 lineBreakMode of .byTruncatingHead。

不过，我不会仅仅替换 .paragraphStyle 。我会获取它，更新其 lineBreakMode，然后用它更新文本属性：

let oldStyle = textField.defaultTextAttributes[.paragraphStyle, default: NSParagraphStyle()] as! NSParagraphStyle
let style = oldStyle.mutableCopy() as! NSMutableParagraphStyle
style.lineBreakMode = .byTruncatingHead
textField.defaultTextAttributes[.paragraphStyle] = style

这里是 .byTruncatingHead、.byTruncatingMiddle 和 < code>.byTruncatingTail，分别为：

You just have to update the text attributes (e.g., defaultTextAttributes) with a .paragraphStyle with a lineBreakMode of .byTruncatingHead.

I would not just replace the .paragraphStyle, though. I would fetch it, update its lineBreakMode, and then update the text attributes with that:

let oldStyle = textField.defaultTextAttributes[.paragraphStyle, default: NSParagraphStyle()] as! NSParagraphStyle
let style = oldStyle.mutableCopy() as! NSMutableParagraphStyle
style.lineBreakMode = .byTruncatingHead
textField.defaultTextAttributes[.paragraphStyle] = style

Here it is with .byTruncatingHead, .byTruncatingMiddle and .byTruncatingTail, respectively:

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老娘不死你永远是小三 2025-01-20 09:24:51

我相信将 NSMutableParagraphStyle's lineBreakMode 与 NSMutableAttributedString 一起使用可能会起作用

let longString = "Hello World"

// Just for demo purposes, you can use auto layout etc
let textfield = UITextField(frame: CGRect(x: 40, y: 200, width: 30, height: 100))
textfield.layer.borderWidth = 2
textfield.layer.borderColor = UIColor.gray.cgColor

// Use a paragraph style to define the truncation method
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineBreakMode = .byTruncatingHead

// Create an attributed string and apply the paragraph style
let attributedString = NSMutableAttributedString(string: longString)
attributedString.addAttribute(.paragraphStyle,
                              value: paragraphStyle,
                              range:NSMakeRange(0, attributedString.length))

// Set the text field's attributed text as the attributed string
textfield.attributedText = attributedString

这给出了类似这样的东西，这就是我认为你想要的：

I believe using NSMutableParagraphStyle's lineBreakMode with NSMutableAttributedString might work

let longString = "Hello World"

// Just for demo purposes, you can use auto layout etc
let textfield = UITextField(frame: CGRect(x: 40, y: 200, width: 30, height: 100))
textfield.layer.borderWidth = 2
textfield.layer.borderColor = UIColor.gray.cgColor

// Use a paragraph style to define the truncation method
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineBreakMode = .byTruncatingHead

// Create an attributed string and apply the paragraph style
let attributedString = NSMutableAttributedString(string: longString)
attributedString.addAttribute(.paragraphStyle,
                              value: paragraphStyle,
                              range:NSMakeRange(0, attributedString.length))

// Set the text field's attributed text as the attributed string
textfield.attributedText = attributedString

This gives something like this, which is what I think you want:

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