Justify text in iOS (Swift or Objective-C) without breaking tracking/kerning/letter spacing

问题

See below:

// Description (HTML string):
var attrStr = NSMutableAttributedString(
    data: formatted.dataUsingEncoding(NSUnicodeStringEncoding, allowLossyConversion: true)!,
    options: [ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType],
    documentAttributes: nil,
    error: nil)

var paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.alignment = NSTextAlignment.Justified
attrStr?.addAttribute(NSParagraphStyleAttributeName, value: paragraphStyle, range: NSMakeRange(0, attrStr!.length))
attrStr?.addAttribute(NSKernAttributeName, value: -0.1, range: NSMakeRange(0, attrStr!.length))
descLabel.attributedText = attrStr
descLabel.sizeToFit()

So far all my attempts to justify text, result in the very same behavior. I've tried via inline-style CSS int eh html text, or using textAlignment property.

The issue is, justifying the text breaks the letter spacing (actually it increases the tracking/kerning of each word instead of only increasing the space in-between).

See:

I would like so see a solution that is not a hack, since I have devised some hacks of my own but then I fall into too many possibilities for other issues.

I'm I missing something simple? I've been through all the UI options and as seen in my code sample, I even tried changing the Kern, which does change but only in proportion (i.e. it still increases).

回答1:

Have you tried adding a NSParagraphStyle attribute with hyphenationFactor of 1?

This will keep your kerning and word spacing, but will add hyphenation when the word needs to break to the next line.

来源：https://stackoverflow.com/questions/30300323/justify-text-in-ios-swift-or-objective-c-without-breaking-tracking-kerning-let

标签

ios

uikit

justify