Color passwords (red digits, blue punctuations)

pass/Views/LabelTableViewCell.swift

@@ -33,6 +33,7 @@ class LabelTableViewCell: UITableViewCell {
             } else {
                 contentLabel.text = cellData?.content
             }
+            contentLabel.font = UIFont(name: "Menlo", size: contentLabel.font.pointSize)
         }
     }
     
@@ -69,7 +70,22 @@ class LabelTableViewCell: UITableViewCell {
     }
         
     func revealPassword(_ sender: Any?) {
-        contentLabel.text = cellData?.content
+        if let plainPassword = cellData?.content {
+            let attributePassword = NSMutableAttributedString.init(string: plainPassword)
+            // draw all digits in the password into red
+            // draw all punctuation characters in the password into blue
+            for (index, element) in plainPassword.unicodeScalars.enumerated() {
+                if NSCharacterSet.decimalDigits.contains(element) {
+                    attributePassword.addAttribute(NSForegroundColorAttributeName, value: UIColor.red , range: NSRange(location: index, length: 1))
+                } else if NSCharacterSet.punctuationCharacters.contains(element) {
+                    attributePassword.addAttribute(NSForegroundColorAttributeName, value: UIColor.blue , range: NSRange(location: index, length: 1))
+                }
+            }
+            // set contentLabel
+            contentLabel.attributedText = attributePassword
+        } else {
+            contentLabel.text = ""
+        }
         isReveal = true
     }