Added support for displaying placeholders

rlaguilar · Oct 11, 2017 · d6806ad · d6806ad
1 parent dfd9a29
commit d6806ad
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Showing 3 changed files with 78 additions and 2 deletions.
diff --git a/Example/MultilineTextField/Base.lproj/Main.storyboard b/Example/MultilineTextField/Base.lproj/Main.storyboard
@@ -28,7 +28,7 @@
                                 <constraints>
                                     <constraint firstAttribute="height" constant="128" id="EXo-qg-uwL"/>
                                 </constraints>
-                                <string key="text">Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiuda.</string>
+                                <string key="text">Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. </string>
                                 <fontDescription key="fontDescription" type="system" pointSize="14"/>
                                 <textInputTraits key="textInputTraits" autocapitalizationType="sentences"/>
                             </textView>

diff --git a/Example/MultilineTextField/ViewController.swift b/Example/MultilineTextField/ViewController.swift
@@ -19,6 +19,17 @@ class ViewController: UIViewController {
 //      imageView.bounds = CGRect(x: 0, y: 0, width: 50, height: 60)
 //      imageView.backgroundColor = .red
       textField.leftView = imageView
+      textField.placeholder = "This is my placeholder"
+
+      print("Printing \(textField.subviews.count) views")
+
+      textField.subviews.forEach { v in
+         print("********")
+         print(v)
+      }
+
+      print("********")
+
    }
 
    override func didReceiveMemoryWarning() {

diff --git a/MultilineTextField/Classes/MultilineTextField.swift b/MultilineTextField/Classes/MultilineTextField.swift
@@ -8,7 +8,37 @@
 import Foundation
 import UIKit
 
-public class MultilineTextField: UITextView {
+public class MultilineTextField: UITextView, UITextViewDelegate {
+   private let placeholderView: UITextView
+
+   public override var text: String! {
+      didSet {
+         self.textViewDidChange(self)
+      }
+   }
+
+   public override var attributedText: NSAttributedString! {
+      didSet {
+         self.textViewDidChange(self)
+      }
+   }
+
+
+   /// The string that is displayed when there is no other text in the text field.
+   /// This value is nil by default. The placeholder string is drawn using the color
+   /// stored in `self.placeholderColor`.
+   public var placeholder: String? {
+      didSet {
+         placeholderView.text = placeholder
+      }
+   }
+
+   public var placeholderColor: UIColor = .black {
+      didSet {
+         placeholderView.textColor = placeholderColor
+      }
+   }
+
    public var leftView: UIView? {
       willSet {
          if let view = self.leftView {
@@ -25,7 +55,42 @@ public class MultilineTextField: UITextView {
             let exclusionPath = UIBezierPath(rect: view.frame)
 
             self.textContainer.exclusionPaths = [exclusionPath]
+            self.placeholderView.textContainer.exclusionPaths = self.textContainer.exclusionPaths
          }
       }
    }
+
+   public override init(frame: CGRect, textContainer: NSTextContainer?) {
+      placeholderView = UITextView(frame: frame, textContainer: textContainer)
+      super.init(frame: frame, textContainer: textContainer)
+      initializeUI()
+   }
+
+   public required init?(coder aDecoder: NSCoder) {
+      // FIXME: What happens with the stored placeholder?
+      placeholderView = UITextView(coder: aDecoder) ?? UITextView()
+      super.init(coder: aDecoder)
+      initializeUI()
+
+   }
+
+   func initializeUI() {
+      self.delegate = self
+
+      self.insertSubview(placeholderView, at: 0)
+
+      placeholderView.frame = self.bounds
+      placeholderView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
+
+      placeholderView.text = ""
+      placeholderView.isEditable = false
+      placeholderView.textColor = UIColor(white: 0.7, alpha: 1)
+
+      textViewDidChange(self)
+   }
+
+   public func textViewDidChange(_ textView: UITextView) {
+       placeholderView.isHidden = !textView.text.isEmpty
+         || !textView.attributedText.string.isEmpty
+   }
 }