Create UITextField extension for set a selected range via `Range<St…

…ring.Index>`
seaburg · Oct 25, 2016 · d6535a4 · d6535a4
1 parent 9b1aab2
commit d6535a4
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diff --git a/FormattedTextField.xcodeproj/project.pbxproj b/FormattedTextField.xcodeproj/project.pbxproj
@@ -7,12 +7,14 @@
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@@ -52,6 +54,7 @@
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 				8FFF61621DBC07C70033E1FC /* FormattedTextField.swift */,
 				8FFF61631DBC07C70033E1FC /* StringExtensions.swift */,
+				8FD40B461DBEB3840015DB1D /* UITextFieldExtension.swift */,
 				8FFF615A1DBC074E0033E1FC /* FormattedTextField.h */,
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@@ -139,6 +142,7 @@
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+				8FD40B471DBEB3840015DB1D /* UITextFieldExtension.swift in Sources */,
 				8FFF61641DBC07C70033E1FC /* FormattedTextField.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;

diff --git a/FormattedTextField/UITextFieldExtension.swift b/FormattedTextField/UITextFieldExtension.swift
@@ -0,0 +1,41 @@
+//
+//  UITextFieldExtension.swift
+//  FormattedTextField
+//
+//  Created by Evgeniy Yurtaev on 25/10/2016.
+//  Copyright © 2016 Evgeniy Yurtaev. All rights reserved.
+//
+
+import UIKit
+
+extension UITextField {
+    var selectedCharachtersRange: Range<String.Index>? {
+        get {
+            guard let selectedTextRange = selectedTextRange else {
+                return nil
+            }
+            guard let text = text else {
+                return nil
+            }
+            let location = offset(from: beginningOfDocument, to: selectedTextRange.start)
+            let length = offset(from: selectedTextRange.start, to: selectedTextRange.end)
+            let range = text.range(fromUtf16NsRange: NSMakeRange(location, length))
+
+            return range
+        }
+        set(value) {
+            guard let value = value else {
+                selectedTextRange = nil
+                return
+            }
+            guard let text = text else {
+                return
+            }
+            let utf16Range = text.utf16Nsrange(fromRange: value)
+
+            let from = position(from: beginningOfDocument, offset: utf16Range.location)!
+            let to = position(from: from, offset: utf16Range.length)!
+            selectedTextRange = textRange(from: from, to: to)
+        }
+    }
+}