我知道UITextView默认可以检测URL，但是如何让它检测hashtags（#）？
在输入时无需检测hashtags，但是当在viewDidLoad中设置了文本后，我想要将hashtags检测出来并以颜色或其他形式显示。
我一直在使用ActiveLabel，但那只适用于UILabel，而我需要UITextView的滚动功能。
如何使UITextView检测到标签？
11
- Roduck Nickes
3
5个回答
18
这对你应该有效
- Create a new swift file with any name(
UITextViewHashtagExtension.swift) Insert this code below:
import UIKit extension UITextView { func resolveHashTags(){ // turn string in to NSString let nsText:NSString = self.text // this needs to be an array of NSString. String does not work. let words:[NSString] = nsText.componentsSeparatedByString(" ") // you can't set the font size in the storyboard anymore, since it gets overridden here. let attrs = [ NSFontAttributeName : UIFont.systemFontOfSize(17.0) ] // you can staple URLs onto attributed strings let attrString = NSMutableAttributedString(string: nsText as String, attributes:attrs) // tag each word if it has a hashtag for word in words { // found a word that is prepended by a hashtag! // homework for you: implement @mentions here too. if word.hasPrefix("#") { // a range is the character position, followed by how many characters are in the word. // we need this because we staple the "href" to this range. let matchRange:NSRange = nsText.rangeOfString(word as String) // convert the word from NSString to String // this allows us to call "dropFirst" to remove the hashtag var stringifiedWord:String = word as String // drop the hashtag stringifiedWord = String(stringifiedWord.characters.dropFirst()) // check to see if the hashtag has numbers. // ribl is "#1" shouldn't be considered a hashtag. let digits = NSCharacterSet.decimalDigitCharacterSet() if let numbersExist = stringifiedWord.rangeOfCharacterFromSet(digits) { // hashtag contains a number, like "#1" // so don't make it clickable } else { // set a link for when the user clicks on this word. // it's not enough to use the word "hash", but you need the url scheme syntax "hash://" // note: since it's a URL now, the color is set to the project's tint color attrString.addAttribute(NSLinkAttributeName, value: "hash:\(stringifiedWord)", range: matchRange) } } } // we're used to textView.text // but here we use textView.attributedText // again, this will also wipe out any fonts and colors from the storyboard, // so remember to re-add them in the attrs dictionary above self.attributedText = attrString } }
self.textView.text = "This is an #example test"
self.textView.resolveHashTags()
更新至Swift 4.0：
extension UITextView {
func resolveHashTags() {
// turn string in to NSString
let nsText = NSString(string: self.text)
// this needs to be an array of NSString. String does not work.
let words = nsText.components(separatedBy: CharacterSet(charactersIn: "#ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_").inverted)
// you can staple URLs onto attributed strings
let attrString = NSMutableAttributedString()
attrString.setAttributedString(self.attributedText)
// tag each word if it has a hashtag
for word in words {
if word.count < 3 {
continue
}
// found a word that is prepended by a hashtag!
// homework for you: implement @mentions here too.
if word.hasPrefix("#") {
// a range is the character position, followed by how many characters are in the word.
// we need this because we staple the "href" to this range.
let matchRange:NSRange = nsText.range(of: word as String)
// drop the hashtag
let stringifiedWord = word.dropFirst()
if let firstChar = stringifiedWord.unicodeScalars.first, NSCharacterSet.decimalDigits.contains(firstChar) {
// hashtag contains a number, like "#1"
// so don't make it clickable
} else {
// set a link for when the user clicks on this word.
// it's not enough to use the word "hash", but you need the url scheme syntax "hash://"
// note: since it's a URL now, the color is set to the project's tint color
attrString.addAttribute(NSAttributedStringKey.link, value: "hash:\(stringifiedWord)", range: matchRange)
}
}
}
// we're used to textView.text
// but here we use textView.attributedText
// again, this will also wipe out any fonts and colors from the storyboard,
// so remember to re-add them in the attrs dictionary above
self.attributedText = attrString
}
}
- Erik Auranaune
5
2阿拉伯语的井号让应用崩溃了 :(( - Kegham K.
今天我了解到，阿拉伯语的标签与其他标签不同。 - Akaino
我能在运行时更改哈希标签的颜色吗？ - Yogesh Patel
如果我的字符串包含类似于“＃Yogesh how are you Yogesh”的内容，那么它会更改起始范围的颜色，因为在我的字符串中我添加了两次相同的字符Yogesh。有什么解决办法吗？谢谢。 - Yogesh Patel
如果您有多个相同的hashtag，此代码仅会检测第一个hashtag。例如：
hello #hi how are you. #hi are you there? 第二个#hi不会被添加为链接。 - Mrugesh Tank8
一种选择是使用
然后像这样分配您的
NSAttributedString，代码如下...func convertHashtags(text:String) -> NSAttributedString {
let attrString = NSMutableAttributedString(string: text)
attrString.beginEditing()
// match all hashtags
do {
// Find all the hashtags in our string
let regex = try NSRegularExpression(pattern: "(?:\\s|^)(#(?:[a-zA-Z].*?|\\d+[a-zA-Z]+.*?))\\b", options: NSRegularExpressionOptions.AnchorsMatchLines)
let results = regex.matchesInString(text,
options: NSMatchingOptions.WithoutAnchoringBounds, range: NSMakeRange(0, text.characters.count))
let array = results.map { (text as NSString).substringWithRange($0.range) }
for hashtag in array {
// get range of the hashtag in the main string
let range = (attrString.string as NSString).rangeOfString(hashtag)
// add a colour to the hashtag
attrString.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor() , range: range)
}
attrString.endEditing()
}
catch {
attrString.endEditing()
}
return attrString
}
然后像这样分配您的
attributedText...let myText = "some text with a #hashtag in side of it #itsnoteasy"
self.textView.attributedText = convertHashtags(myText)
- Wez
3
谢谢！另一个快速问题：我如何检测对哈希标签的按下？当哈希标签被点击时执行某个操作。 - Roduck Nickes
3我完全不知道。 - Wez
4这个hashtag已经可以被点击了，因为我们将它添加到了链接“hash:hashtag”中。我们只需要加上“textView.delegate = self”，并监听函数“func textView(textView: UITextView, shouldInteractWithURL URL: NSURL, inRange characterRange: NSRange) -> Bool”。（您如何格式化此代码？） - rcpfuchs
5
针对Swift 4.0版本
extension UITextView {
func resolveHashTags() {
// turn string in to NSString
let nsText = NSString(string: self.text)
// this needs to be an array of NSString. String does not work.
let words = nsText.components(separatedBy: CharacterSet(charactersIn: "#ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_").inverted)
// you can staple URLs onto attributed strings
let attrString = NSMutableAttributedString()
attrString.setAttributedString(self.attributedText)
// tag each word if it has a hashtag
for word in words {
if word.count < 3 {
continue
}
// found a word that is prepended by a hashtag!
// homework for you: implement @mentions here too.
if word.hasPrefix("#") {
// a range is the character position, followed by how many characters are in the word.
// we need this because we staple the "href" to this range.
let matchRange:NSRange = nsText.range(of: word as String)
// drop the hashtag
let stringifiedWord = word.dropFirst()
if let firstChar = stringifiedWord.unicodeScalars.first, NSCharacterSet.decimalDigits.contains(firstChar) {
// hashtag contains a number, like "#1"
// so don't make it clickable
} else {
// set a link for when the user clicks on this word.
// it's not enough to use the word "hash", but you need the url scheme syntax "hash://"
// note: since it's a URL now, the color is set to the project's tint color
attrString.addAttribute(NSAttributedStringKey.link, value: "hash:\(stringifiedWord)", range: matchRange)
}
}
}
// we're used to textView.text
// but here we use textView.attributedText
// again, this will also wipe out any fonts and colors from the storyboard,
// so remember to re-add them in the attrs dictionary above
self.attributedText = attrString
}
}
- Amr
3
针对Swift 3+
extension UITextView {
func convertHashtags(text:String) -> NSAttributedString {
let attr = [
NSFontAttributeName : UIFont.systemFont(ofSize: 17.0),
NSForegroundColorAttributeName : clr_golden,
NSLinkAttributeName : "https://Laitkor.com"
] as [String : Any]
let attrString = NSMutableAttributedString(string: text)
attrString.beginEditing()
// match all hashtags
do {
// Find all the hashtags in our string
let regex = try NSRegularExpression(pattern: "(?:\\s|^)(#(?:[a-zA-Z].*?|\\d+[a-zA-Z]+.*?))\\b", options: NSRegularExpression.Options.anchorsMatchLines)
let results = regex.matches(in: text,
options: NSRegularExpression.MatchingOptions.withoutAnchoringBounds, range: NSMakeRange(0, text.characters.count))
let array = results.map { (text as NSString).substring(with: $0.range) }
for hashtag in array {
// get range of the hashtag in the main string
let range = (attrString.string as NSString).range(of: hashtag)
// add a colour to the hashtag
//attrString.addAttribute(NSForegroundColorAttributeName, value: clr_golden , range: range)
attrString.addAttributes(attr, range: range)
}
attrString.endEditing()
}
catch {
attrString.endEditing()
}
return attrString
}
}
在你的类中添加UITextViewDelegate并按如下方式使用
self.tv_yourTextView.delegate = self
self.tv_yourTextView.attributedText = tv_yourTextView.convertHashtags(text: "This is an #museer test")
委托函数
func textView(_ textView: UITextView, shouldInteractWith URL: URL, in characterRange: NSRange) -> Bool {
print("hastag Selected!")
return true
}
-> 修改自@Wez的答案
- Museer Ahamad Ansari
1
嗨，当我点击标签时，应该调用shouldInteractWith这个方法，但我只想要名称，它应该显示为hash：name。我怎么才能在这里只获取名称？谢谢。 - Yogesh Patel
0
当需要提及或使用hashtag或任何单词时，您可以通过以下方式实现：
func convertRegex(text:String, regex: String) -> NSAttributedString {
let attr:[NSAttributedString.Key:Any] = [
NSAttributedString.Key.font : UIFont.systemFont(ofSize: 17.0),
NSAttributedString.Key.foregroundColor : UIColor.green,
] as [NSAttributedString.Key : Any]
let attrString = NSMutableAttributedString(string: text)
attrString.beginEditing()
do {
// Find all the specific word in our string
let regex = try NSRegularExpression(pattern: "\\s\(regex)\\b" , options: NSRegularExpression.Options.anchorsMatchLines)
let results = regex.matches(in: text,
options: NSRegularExpression.MatchingOptions.withoutAnchoringBounds, range: NSMakeRange(0, text.count))
let array = results.map { (text as NSString).substring(with: $0.range) }
for word in array {
let range = (attrString.string as NSString).range(of: word)
attrString.addAttributes(attr, range: range)
}
attrString.endEditing()
}
catch {
attrString.endEditing()
}
return attrString
}
- Soha Mohamed
1
网页内容由stack overflow 提供, 点击上面的可以查看英文原文，
原文链接
原文链接
ActiveLabel放在一个UIScrollView中。 - rckoenes