[Feat] Node에 prev 추가 #8

GO-SOPT-iOS-Part · Apr 23, 2023 · 4d3a5d0 · 4d3a5d0
1 parent f12c682
commit 4d3a5d0
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Showing 3 changed files with 40 additions and 15 deletions.
diff --git a/SOPTving/SOPTving/Presentation/MainScene/VC/MainVC.swift b/SOPTving/SOPTving/Presentation/MainScene/VC/MainVC.swift
@@ -37,6 +37,17 @@ final class MainVC: UIViewController {
         return label
     }()
 
+    private lazy var prevButton = ButtonBuilder()
+                                    .setTitle("이전으로",
+                                             color: .white,
+                                             font: .tvingSemiBold(ofSize: 16))
+                                    .setBackgroundColor(.systemBlue)
+                                    .setCornerRadius(12)
+                                    .setAction { [weak self] _ in
+                                        self?.prevButtonDidTap()
+                                    }
+                                    .build()
+
     private lazy var nextButton = ButtonBuilder()
                                     .setTitle("다음으로",
                                              color: .white,
@@ -48,6 +59,7 @@ final class MainVC: UIViewController {
                                     }
                                     .build()
 
+
     //MARK: - Life Cycle
 
     override func viewDidLoad() {
@@ -84,7 +96,7 @@ extension MainVC {
 
     private func setData() {
         dataLinkedList.append(data: data)
-        currentNode = dataLinkedList.getFirstNode()
+        currentNode = dataLinkedList.getHead()
     }
 
 }
@@ -95,6 +107,10 @@ extension MainVC {
     func nextButtonDidTap() {
         currentNode = currentNode?.next
     }
+
+    func prevButtonDidTap() {
+        currentNode = currentNode?.prev
+    }
 }
 
 
@@ -110,7 +126,7 @@ extension MainVC {
     }
 
     private func hierarchy() {
-        view.addSubviews(profileLabel, nextButton)
+        view.addSubviews(profileLabel, prevButton, nextButton)
     }
 
     private func layout() {
@@ -119,7 +135,14 @@ extension MainVC {
         }
 
         nextButton.snp.makeConstraints {
-            $0.centerX.equalToSuperview()
+            $0.centerX.equalToSuperview().offset(50)
+            $0.top.equalTo(profileLabel.snp.bottom).offset(100)
+            $0.height.equalTo(40)
+            $0.width.equalTo(80)
+        }
+
+        prevButton.snp.makeConstraints {
+            $0.centerX.equalToSuperview().offset(-50)
             $0.top.equalTo(profileLabel.snp.bottom).offset(100)
             $0.height.equalTo(40)
             $0.width.equalTo(80)

diff --git a/SOPTving/SOPTving/Utility/DataStructure/LinkedList.swift b/SOPTving/SOPTving/Utility/DataStructure/LinkedList.swift
@@ -8,39 +8,39 @@
 import Foundation
 
 final class LinkedList<T> {
+
     private var head: Node<T>?
     private var tail: Node<T>?
 
     var isEmpty: Bool {
            return head == nil
        }
 
-    func append(data: T?) {
+    func append(data: T) {
         let newNode = Node(data)
 
         if isEmpty {
             head = newNode
             tail = newNode
-            tail?.next = head
         } else {
             tail?.next = newNode
+            newNode.prev = tail
             tail = newNode
-            tail?.next = head
         }
+
+        head?.prev = tail
+        tail?.next = head
     }
 
     // append 인자에 배열을 넣었을 경우, append(T)를 반복한다.
-    func append(data: [T]?) {
-        guard let data else { return }
-        for t in data {
-            append(data: t)
+    func append(data: [T]) {
+        for d in data {
+            append(data: d)
         }
     }
 
-    func getFirstNode() -> Node<T>? {
+    func getHead() -> Node<T>? {
         return head
     }
 
-
-
 }
diff --git a/SOPTving/SOPTving/Utility/DataStructure/Node.swift b/SOPTving/SOPTving/Utility/DataStructure/Node.swift
@@ -8,11 +8,13 @@
 import Foundation
 
 final class Node<T> {
-    var data: T?
+    var data: T
+    var prev: Node?
     var next: Node?
 
-    init(_ data: T?, next: Node? = nil) {
+    init(_ data: T, prev: Node? = nil, next: Node? = nil) {
         self.data = data
+        self.prev = prev
         self.next = next
     }
 }