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let attrText = NSMutableAttributedString(string: "rich text")
attrText.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: NSMakeRange(0, 4))
textView.attributedText = attrText


上記は文字色を変更する方法ですが、他にも文字の背景色 (NSBackgroundColorAttributeName) 等を変更できます。


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