仅更改NSAttributedString的字体大小 [英] Change only fontsize of NSAttributedString

问题描述

我有一个从RTF文件加载的NSAttributedString，所以它已经包含了不同范围的几个字体属性. 现在，我想使字体大小适应设备的屏幕大小，但是当我添加一个具有新大小的全新字体属性时，其他字体就会消失.

I have a NSAttributedString that was loaded from a RTF file, so it already holds several font-attributes for different ranges. Now I want to adapt the font size to the screensize of the device, but when I add a whole new font attribute with a new size, the other fonts disappear.

是否可以更改整个字符串的 only 字体大小?

Is there a way to change only the font size for the whole string?

推荐答案

如果只想更改在属性字符串中找到的任何给定字体的大小，则可以执行以下操作:

If you only want to change the size of any given font found in the attributed string then you can do:

let newStr = someAttributedString.mutableCopy() as! NSMutableAttributedString
newStr.beginEditing()
newStr.enumerateAttribute(.font, in: NSRange(location: 0, length: newStr.string.utf16.count)) { (value, range, stop) in
    if let oldFont = value as? UIFont {
        let newFont = oldFont.withSize(20) // whatever size you need
        newStr.addAttribute(.font, value: newFont, range: range)
    }
}
newStr.endEditing()

print(newStr)

这将保留所有其他属性.

This will keep all other attributes in place.

如果要将给定属性字符串中的所有字体替换为给定大小的单个字体，但保留所有其他属性(如粗体和斜体)，请参见: NSAttributedString，更改字体整体，但保留所有其他属性吗?

If you want to replace all fonts in a given attributed string with a single font of a given size but keep all other attributes such as bold and italic, see: NSAttributedString, change the font overall BUT keep all other attributes?

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