Agrega ordenamiento de contactos por nombre y divide en secciones

ContactsApp.xcodeproj/project.pbxproj

@@ -15,6 +15,8 @@
 		CEC259D8241FAC79005237F5 /* ContactStruct.swift in Sources */ = {isa = PBXBuildFile; fileRef = CEC259D7241FAC79005237F5 /* ContactStruct.swift */; };
 		CEC9A37F241BFBD000F024EE /* ContactsViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = CEC9A37E241BFBD000F024EE /* ContactsViewController.swift */; };
 		CEC9A381241C096D00F024EE /* SingleContactViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = CEC9A380241C096D00F024EE /* SingleContactViewController.swift */; };
+		CED5EABE242A4CF800E22547 /* ContactSection.xib in Resources */ = {isa = PBXBuildFile; fileRef = CED5EABD242A4CF800E22547 /* ContactSection.xib */; };
+		CED5EAC2242A509800E22547 /* ContactSectionTableViewCell.swift in Sources */ = {isa = PBXBuildFile; fileRef = CED5EAC1242A509800E22547 /* ContactSectionTableViewCell.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -28,6 +30,8 @@
 		CEC259D7241FAC79005237F5 /* ContactStruct.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContactStruct.swift; sourceTree = "<group>"; };
 		CEC9A37E241BFBD000F024EE /* ContactsViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContactsViewController.swift; sourceTree = "<group>"; };
 		CEC9A380241C096D00F024EE /* SingleContactViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SingleContactViewController.swift; sourceTree = "<group>"; };
+		CED5EABD242A4CF800E22547 /* ContactSection.xib */ = {isa = PBXFileReference; lastKnownFileType = file.xib; path = ContactSection.xib; sourceTree = "<group>"; };
+		CED5EAC1242A509800E22547 /* ContactSectionTableViewCell.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContactSectionTableViewCell.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -69,6 +73,8 @@
 				CEC9A37E241BFBD000F024EE /* ContactsViewController.swift */,
 				CEC9A380241C096D00F024EE /* SingleContactViewController.swift */,
 				CEC259D7241FAC79005237F5 /* ContactStruct.swift */,
+				CED5EABD242A4CF800E22547 /* ContactSection.xib */,
+				CED5EAC1242A509800E22547 /* ContactSectionTableViewCell.swift */,
 			);
 			path = ContactsApp;
 			sourceTree = "<group>";
@@ -131,6 +137,7 @@
 			isa = PBXResourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				CED5EABE242A4CF800E22547 /* ContactSection.xib in Resources */,
 				CE3351F8241A65D500BA57CA /* LaunchScreen.storyboard in Resources */,
 				CE3351F5241A65D500BA57CA /* Assets.xcassets in Resources */,
 				CE3351F3241A65D400BA57CA /* Main.storyboard in Resources */,
@@ -144,6 +151,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				CED5EAC2242A509800E22547 /* ContactSectionTableViewCell.swift in Sources */,
 				CEC259D8241FAC79005237F5 /* ContactStruct.swift in Sources */,
 				CE3351EC241A65D400BA57CA /* AppDelegate.swift in Sources */,
 				CEC9A37F241BFBD000F024EE /* ContactsViewController.swift in Sources */,

ContactsApp/ContactStruct.swift

@@ -12,4 +12,5 @@ import ContactsUI
 struct ContactStruct {
     var isExpanded: Bool
     let contacts  : [CNContact]
+    let letter    : String
 }

ContactsApp/ContactsViewController.swift

@@ -12,9 +12,8 @@ import ContactsUI
 class ContactsViewController: UIViewController {
     
     @IBOutlet weak var contactsTable: UITableView!
-    var contactStruct = [ContactStruct]()
-    var contacts = [CNContact]()
-    //var contactsBackup = [CNContact]()
+    var contactStructArray = [ContactStruct]()
+    var contactStruct : ContactStruct?
     let contactStore = CNContactStore()
     
     override func viewDidLoad() {
@@ -29,19 +28,36 @@ class ContactsViewController: UIViewController {
         let request = CNContactFetchRequest( keysToFetch: keys as! [CNKeyDescriptor])
         request.sortOrder = CNContactSortOrder.givenName
         do {
+            var auxLetter = ""
+            var contacts = [CNContact]()
+            var isNotTheFirst = false
             try self.contactStore.enumerateContacts(with: request) {
                 (contact, stop) in
-                // Array containing all unified contacts from everywhere
-                self.contacts.append(contact)
+                if contact.givenName.prefix(1) == auxLetter {
+                    contacts.append(contact)
+                } else {
+                    if isNotTheFirst {
+                        let contactsExpandables = ContactStruct(isExpanded: true, contacts: contacts, letter: auxLetter)
+                        self.contactStructArray.append(contactsExpandables) //guardamos el contacto expandible anterior
+                        auxLetter = String(contact.givenName.prefix(1)) //guardamos la nueva letra
+                        contacts = [CNContact]() //inicializamos nuevamente el array de contactos
+                        contacts.append(contact) //guardamos el nuevo contacto
+                    } else {
+                        contacts.append(contact)
+                        auxLetter = String(contact.givenName.prefix(1)) //auxLetter tiene la primera letra del nombre
+                        isNotTheFirst = true //la siguiente vez que las letras no sean iguales guardara en el array
+                    }
+
                 }
-            let contactsExpandables = ContactStruct(isExpanded: true, contacts: contacts)
-            self.contactStruct = [contactsExpandables]
+            }
+            self.contactStructArray.append(ContactStruct(isExpanded: true, contacts: contacts, letter: auxLetter)) //agregamos el ultimo nombre
+            print("CONTACTOS ORDENADOS")
+            print(self.contactStructArray)
+            print("======================")
         }
         catch {
             print("unable to fetch contacts")
         }
-
-        print(contacts)
     }
     
     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
@@ -53,17 +69,22 @@ class ContactsViewController: UIViewController {
     }
 }
 extension ContactsViewController: UITableViewDelegate, UITableViewDataSource {
+    
+    func numberOfSections(in tableView: UITableView) -> Int {
+        return contactStructArray.count
+    }
+    
     func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
-        if !contactStruct[section].isExpanded {
+        if !contactStructArray[section].isExpanded {
             return 0
         }
         
-        return contactStruct[section].contacts.count
+        return contactStructArray[section].contacts.count
     }
     
     func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {        
         let cell = tableView.dequeueReusableCell(withIdentifier: "contactName")!
-        let contactCell = contactStruct[indexPath.section].contacts[indexPath.row]
+        let contactCell = contactStructArray[indexPath.section].contacts[indexPath.row]
 
         cell.textLabel?.text = "\(contactCell.givenName) \(contactCell.familyName)"
         
@@ -71,7 +92,7 @@ extension ContactsViewController: UITableViewDelegate, UITableViewDataSource {
     }
     
     func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
-        let selectedContact = contacts[indexPath.row]
+        let selectedContact = contactStructArray[indexPath.section].contacts[indexPath.row]
         performSegue(withIdentifier: "gotocontact", sender: selectedContact)
     }
     
@@ -85,23 +106,23 @@ extension ContactsViewController: UITableViewDelegate, UITableViewDataSource {
         button.setTitleColor(.black, for: .normal)
         button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 15)
         button.backgroundColor = .systemGray4
-        button.addTarget(self, action: #selector(closeSection), for: .touchUpInside)
+        button.addTarget(self, action: #selector(interactSection), for: .touchUpInside)
         button.tag = section
         return button//ʌΛ
     }
     
-    @objc func closeSection(button : UIButton) {
+    @objc func interactSection(button : UIButton) {
         //contactsBackup = contacts
         let section = button.tag
         
         var indexPaths = [IndexPath]()
-        for row in contactStruct[section].contacts.indices {
+        for row in contactStructArray[section].contacts.indices {
             let indexPath = IndexPath(row: row, section: section)
             indexPaths.append(indexPath)
         }
 
-        let isExpanded = contactStruct[section].isExpanded
-        contactStruct[section].isExpanded = !isExpanded
+        let isExpanded = contactStructArray[section].isExpanded
+        contactStructArray[section].isExpanded = !isExpanded
         
         button.setTitle(isExpanded ? "V" : "Λ", for: .normal)