new way for ChatTextView detect mention

Yep/Views/Cells/ChatLeftText/ChatLeftTextCell.swift

@@ -33,12 +33,14 @@ class ChatLeftTextCell: ChatBaseCell {
 
         avatarImageView.center = CGPoint(x: YepConfig.chatCellGapBetweenWallAndAvatar() + halfAvatarSize, y: halfAvatarSize + topOffset)
 
+        /*
         textContentTextView.chatTextStorage.mentionForegroundColor = UIColor.yepTintColor()
         textContentTextView.linkTapEnabled = true
 
         prepareForMenuAction = { [weak self] otherGesturesEnabled in
             self?.textContentTextView.linkTapGestureRecognizer?.enabled = otherGesturesEnabled
         }
+        */
 
         textContentTextView.tapMentionAction = { [weak self] username in
             self?.tapUsernameAction?(username: username)

Yep/Views/Cells/ChatRightText/ChatRightTextCell.swift

@@ -30,12 +30,14 @@ class ChatRightTextCell: ChatRightBaseCell {
 
         avatarImageView.center = CGPoint(x: fullWidth - halfAvatarSize - YepConfig.chatCellGapBetweenWallAndAvatar(), y: halfAvatarSize)
 
+        /*
         textContentTextView.chatTextStorage.mentionForegroundColor = UIColor.whiteColor()
         textContentTextView.linkTapEnabled = true
 
         prepareForMenuAction = { [weak self] otherGesturesEnabled in
             self?.textContentTextView.linkTapGestureRecognizer?.enabled = otherGesturesEnabled
         }
+        */
 
         textContentTextView.tapMentionAction = { [weak self] username in
             self?.tapUsernameAction?(username: username)

Yep/Views/TextViews/ChatTextView.swift

@@ -8,6 +8,103 @@
 
 import UIKit
 
+class ChatTextView: UITextView {
+
+    var mentionForegroundColor: UIColor = UIColor.redColor()
+    var tapMentionAction: ((username: String) -> Void)?
+
+    static let detectionTypeName = "ChatTextStorage.detectionTypeName"
+
+    enum DetectionType: String {
+        case Mention
+    }
+
+    override func didMoveToSuperview() {
+        super.didMoveToSuperview()
+
+        self.delegate = self
+    }
+
+    override var text: String! {
+        didSet {
+            let attributedString = NSMutableAttributedString(string: text)
+
+            let textRange = NSMakeRange(0, (text as NSString).length)
+
+            let mentionPattern = "@[^\\s:：,，@]+$?"
+
+            let mentionExpression = try! NSRegularExpression(pattern: mentionPattern, options: NSRegularExpressionOptions())
+
+            mentionExpression.enumerateMatchesInString(text, options: NSMatchingOptions(), range: textRange, usingBlock: { result, flags, stop in
+
+                if let result = result {
+                    let textValue = (self.text as NSString).substringWithRange(result.range)
+
+                    let textAttributes: [String: AnyObject] = [
+                        NSForegroundColorAttributeName: self.mentionForegroundColor,
+                        NSLinkAttributeName: textValue,
+                        ChatTextView.detectionTypeName: DetectionType.Mention.rawValue,
+                    ]
+
+                    attributedString.addAttributes(textAttributes, range: result.range )
+                }
+            })
+
+            self.attributedText = attributedString
+        }
+    }
+
+    // MARK: 点击链接 hack
+
+    override func canBecomeFirstResponder() -> Bool {
+        return false
+    }
+
+    override func addGestureRecognizer(gestureRecognizer: UIGestureRecognizer) {
+
+        // iOS 9 以上，强制不添加文字选择长按手势，免去触发选择文字
+        // 共有四种长按手势，iOS 9 正式版里分别加了两次：0.1 Reveal，0.12 tap link，0.5 selection， 0.75 press link
+        if isOperatingSystemAtLeastMajorVersion(9) {
+            if let longPressGestureRecognizer = gestureRecognizer as? UILongPressGestureRecognizer {
+                if longPressGestureRecognizer.minimumPressDuration == 0.5 {
+                    return
+                }
+            }
+        }
+
+        super.addGestureRecognizer(gestureRecognizer)
+    }
+}
+
+extension ChatTextView: UITextViewDelegate {
+
+    func textView(textView: UITextView, shouldInteractWithURL URL: NSURL, inRange characterRange: NSRange) -> Bool {
+
+        guard let detectionTypeName = self.attributedText.attribute(ChatTextView.detectionTypeName, atIndex: characterRange.location, effectiveRange: nil) as? String, detectionType = DetectionType(rawValue: detectionTypeName) else {
+            return true
+        }
+
+        let text = (self.text as NSString).substringWithRange(characterRange)
+
+        self.hangleTapText(text, withDetectionType: detectionType)
+
+        return true
+    }
+
+    private func hangleTapText(text: String, withDetectionType detectionType: DetectionType) {
+
+        println("hangleTapText: \(text), \(detectionType)")
+
+        let username = text.substringFromIndex(text.startIndex.advancedBy(1))
+
+        if !username.isEmpty {
+            tapMentionAction?(username: username)
+        }
+    }
+}
+
+/*
+
 // MARK: ChatTextStorage
 
 class ChatTextStorage: NSTextStorage {
@@ -262,3 +359,4 @@ extension ChatTextView: UIGestureRecognizerDelegate {
     }
 }
 
+*/