我有一个textView,我试图给它一个属性文本。我尝试在shouldChangeTextInRange
内实现它,但它在索引范围之外崩溃。
func textView(textView: UITextView, shouldChangeTextInRange range: NSRange, replacementText text: String) -> Bool {
if myTextView {
textView.attributedText = addAttributedText(1, text: text, fontsize: 13)
let newText = (textView.text as NSString).stringByReplacingCharactersInRange(range, withString: text)
let numberOfChars = newText.characters.count
return numberOfChars < 20
}
return true
}
func addAttributedText(spacing:CGFloat, text:String, fontsize: CGFloat) -> NSMutableAttributedString {
let attributedString = NSMutableAttributedString(string: text, attributes: [NSFontAttributeName:UIFont(
name: "Font",
size: fontsize)!])
attributedString.addAttribute(NSKernAttributeName, value: spacing, range: NSMakeRange(0, text.characters.count))
return attributedString
}
我尝试将带有空文本的attributionString添加到viewDidLoad中的textView,但这并没有帮助。这就是我认为在shouldChangeTextInRange
(请注意,我的addAttributedText
方法适用于其他文字视图)
如果我使用它,在一个字符输入中,它写入2x并崩溃。处理将textView的文本转换为正在键入的文本的正确方法是什么。
答案 0 :(得分:1)
以下是我尝试从上面的链接转换的代码,它可能有错误,但我希望它能够帮助您。
func formatTextInTextView(textView: UITextView)
{
textView.scrollEnabled = false
var selectedRange: NSRange = textView.selectedRange
var text: String = textView.text!
// This will give me an attributedString with the base text-style
var attributedString: NSMutableAttributedString = NSMutableAttributedString(string: text)
var error: NSError? = nil
var regex: NSRegularExpression = NSRegularExpression.regularExpressionWithPattern("#(\\w+)", options: 0, error: error!)
var matches: [AnyObject] = regex.matchesInString(text, options: 0, range: NSMakeRange(0, text.length))
for match: NSTextCheckingResult in matches {
var matchRange: NSRange = match.rangeAtIndex(0)
attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: matchRange)
}
textView.attributedText = attributedString
textView.selectedRange = selectedRange
textView.scrollEnabled = true
}
编辑:在原帖中没有看到Swift的答案,这里是链接:stackoverflow.com/a/35842523/1226963