[Refactor] TeamSparker#571 - SendSparkButton 이니셜라이저를 활용한 초기화로 리펙토링

- 불필요한 오버라이드하던 생성자 삭제.
- UI 가 변경되면서 사용하지 않던 isSelected 삭제.
- didset property observer 를 통해서 content 설정

Spark-iOS/Spark-iOS/Source/Classes/SendSparkButton.swift

@@ -20,23 +20,23 @@ final class SendSparkButton: UIButton {
 
     // MARK: - Properties
 
-    var type: SendSparkStatus?
+    var type: SendSparkStatus {
+        didSet {
+            self.setContent()
+        }
+    }
     var content: String?
 
     // MARK: - Initialize
 
-    override init(frame: CGRect) {
-        super.init(frame: frame)
-    }
-
     required init?(coder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }
 
-    public init(type: SendSparkStatus) {
+    init(type: SendSparkStatus) {
+        self.type = type
         super.init(frame: .zero)
-
-        setUI(type)
+        setUI(self.type)
     }
 }
 
@@ -53,8 +53,10 @@ extension SendSparkButton {
         self.titleLabel?.lineBreakMode = .byCharWrapping
         self.titleLabel?.textAlignment = .center
         self.type = type
-
-        switch type {
+    }
+
+    private func setContent() {
+        switch self.type {
         case .message:
             self.setTitle("""
                           메시지
@@ -97,18 +99,4 @@ extension SendSparkButton {
             self.content = "👍얼마 안 남았어, 어서 하자!"
         }
     }
-
-    public func isSelected(_ isSelected: Bool) {
-        if isSelected {
-            self.setTitleColor(.sparkDarkPinkred, for: .normal)
-            self.backgroundColor = .sparkMostLightPinkred
-            self.titleLabel?.backgroundColor = .sparkMostLightPinkred
-            self.layer.borderColor = UIColor.sparkDarkPinkred.cgColor
-        } else {
-            self.setTitleColor(.sparkLightPinkred, for: .normal)
-            self.backgroundColor = .sparkWhite
-            self.titleLabel?.backgroundColor = .sparkWhite
-            self.layer.borderColor = UIColor.sparkLightPinkred.cgColor
-        }
-    }
 }