UITextView/NSAttribute:检测单词是否以特定符号开头
UITextView/NSAttribute: Detect if word starts with a particular symbol
我一直在寻找一种方法来更改 UITextView
中的文本,当单词以 "@"
或 "#"
开头时。我在下面的 Whosebug 上找到了 ,如果您键入 "Hello"
或 "World"
.
,它会完美运行
我如何调整此代码,以便它可以检测单词是否以“@”或“#”开头,后跟任何数量的字符,然后是 space,并应用相同的样式?
如果用户使用 "@"
或 "#"
启动 'word',结果将导致 UITextView
中文本的颜色发生变化。即:
快速棕色 #fox 跳过了 @lazydog。
func textViewDidChange(_ textView: UITextView) {
let defaultAttributes = mediaDescription.attributedText.attributes(at: 0, effectiveRange: nil)
let attrStr = NSMutableAttributedString(string: textView.text, attributes: defaultAttributes)
let inputLength = attrStr.string.count
let searchString : NSArray = NSArray.init(objects: "hello", "world")
for i in 0...searchString.count-1
{
let string : String = searchString.object(at: i) as! String
let searchLength = string.count
var range = NSRange(location: 0, length: attrStr.length)
while (range.location != NSNotFound) {
range = (attrStr.string as NSString).range(of: string, options: [], range: range)
if (range.location != NSNotFound) {
attrStr.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.red, range: NSRange(location: range.location, length: searchLength))
attrStr.addAttribute(NSAttributedStringKey.font, value: UIFont(name: "Karla-Regular", size: 16.0)!, range: NSRange(location: range.location, length: searchLength))
range = NSRange(location: range.location + range.length, length: inputLength - (range.location + range.length))
textView.attributedText = attrStr
}
}
}
}
假设你在文中保留#
或@
,你可以修改Larme评论中的答案:
let regex = try! NSRegularExpression(pattern: "(?:#|@)\w+", options: [])
func textViewDidChange(_ textView: UITextView) {
let attrStr = NSMutableAttributedString(attributedString: textView.attributedText ?? NSAttributedString())
let plainStr = attrStr.string
attrStr.addAttribute(.foregroundColor, value: UIColor.black, range: NSRange(0..<plainStr.utf16.count))
let matches = regex.matches(in: plainStr, range: NSRange(0..<plainStr.utf16.count))
for match in matches {
let nsRange = match.range
let matchStr = plainStr[Range(nsRange, in: plainStr)!]
let color: UIColor
if matchStr.hasPrefix("#") {
color = .red
} else {
color = .blue
}
attrStr.addAttribute(.foregroundColor, value: color, range: nsRange)
}
textView.attributedText = attrStr
}
刚刚换了个图案,适配了Swift4.1,修复了一些bug,去掉了一些多余的代码,加了一些改颜色的代码。
我一直在寻找一种方法来更改 UITextView
中的文本,当单词以 "@"
或 "#"
开头时。我在下面的 Whosebug 上找到了 "Hello"
或 "World"
.
我如何调整此代码,以便它可以检测单词是否以“@”或“#”开头,后跟任何数量的字符,然后是 space,并应用相同的样式?
如果用户使用 "@"
或 "#"
启动 'word',结果将导致 UITextView
中文本的颜色发生变化。即:
快速棕色 #fox 跳过了 @lazydog。
func textViewDidChange(_ textView: UITextView) {
let defaultAttributes = mediaDescription.attributedText.attributes(at: 0, effectiveRange: nil)
let attrStr = NSMutableAttributedString(string: textView.text, attributes: defaultAttributes)
let inputLength = attrStr.string.count
let searchString : NSArray = NSArray.init(objects: "hello", "world")
for i in 0...searchString.count-1
{
let string : String = searchString.object(at: i) as! String
let searchLength = string.count
var range = NSRange(location: 0, length: attrStr.length)
while (range.location != NSNotFound) {
range = (attrStr.string as NSString).range(of: string, options: [], range: range)
if (range.location != NSNotFound) {
attrStr.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.red, range: NSRange(location: range.location, length: searchLength))
attrStr.addAttribute(NSAttributedStringKey.font, value: UIFont(name: "Karla-Regular", size: 16.0)!, range: NSRange(location: range.location, length: searchLength))
range = NSRange(location: range.location + range.length, length: inputLength - (range.location + range.length))
textView.attributedText = attrStr
}
}
}
}
假设你在文中保留#
或@
,你可以修改Larme评论中的答案:
let regex = try! NSRegularExpression(pattern: "(?:#|@)\w+", options: [])
func textViewDidChange(_ textView: UITextView) {
let attrStr = NSMutableAttributedString(attributedString: textView.attributedText ?? NSAttributedString())
let plainStr = attrStr.string
attrStr.addAttribute(.foregroundColor, value: UIColor.black, range: NSRange(0..<plainStr.utf16.count))
let matches = regex.matches(in: plainStr, range: NSRange(0..<plainStr.utf16.count))
for match in matches {
let nsRange = match.range
let matchStr = plainStr[Range(nsRange, in: plainStr)!]
let color: UIColor
if matchStr.hasPrefix("#") {
color = .red
} else {
color = .blue
}
attrStr.addAttribute(.foregroundColor, value: color, range: nsRange)
}
textView.attributedText = attrStr
}
刚刚换了个图案,适配了Swift4.1,修复了一些bug,去掉了一些多余的代码,加了一些改颜色的代码。