[#3] extension 추가

CheoMooRac/CheoMooRac/Sources/Exensions/UIButton+setBackgroundColor.swift

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+//
+//  UIButton+setBackgroundColor.swift
+//  CheoMooRac
+//
+//  Created by 김윤서 on 2021/09/15.
+//
+
+import UIKit
+
+extension UIButton {
+    func setBackgroundColor(_ color: UIColor, for state: UIControl.State) {
+        UIGraphicsBeginImageContext(CGSize(width: 1.0, height: 1.0))
+        guard let context = UIGraphicsGetCurrentContext() else { return }
+        context.setFillColor(color.cgColor)
+        context.fill(CGRect(x: 0.0, y: 0.0, width: 1.0, height: 1.0))
+
+        let backgroundImage = UIGraphicsGetImageFromCurrentImageContext()
+        UIGraphicsEndImageContext()
+
+        setBackgroundImage(backgroundImage, for: state)
+    }
+}

CheoMooRac/CheoMooRac/Sources/Exensions/UIStackView+addArrangedSubviews.swift

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+//
+//  UIStackView+addArrangedSubviews.swift
+//  CheoMooRac
+//
+//  Created by 김윤서 on 2021/09/14.
+//
+
+import UIKit
+
+extension UIStackView {
+    func addArrangedSubviews(_ views: UIView...) {
+        for view in views { addArrangedSubview(view) }
+    }
+}

CheoMooRac/CheoMooRac/Sources/Exensions/UITableView+Generic.swift

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+//
+//  UITableView+Generic.swift
+//  CheoMooRac
+//
+//  Created by 김윤서 on 2021/09/14.
+//
+
+import UIKit
+
+protocol Reusable: AnyObject {
+  static var reuseIdentifier: String { get }
+  static var nib: UINib? { get }
+}
+
+extension Reusable {
+  static var reuseIdentifier: String { return String(describing: self) }
+  static var nib: UINib? { return nil }
+}
+
+extension UITableView {
+    func registerReusableCell<T: UITableViewCell>(_: T.Type) where T: Reusable {
+    if let nib = T.nib {
+        self.register(nib, forCellReuseIdentifier: T.reuseIdentifier)
+    } else {
+        self.register(T.self, forCellReuseIdentifier: T.reuseIdentifier)
+    }
+  }
+
+    func dequeueReusableCell<T: UITableViewCell>(indexPath: IndexPath) -> T where T: Reusable {
+        return self.dequeueReusableCell(withIdentifier: T.reuseIdentifier, for: indexPath as IndexPath) as! T
+  }
+
+    func registerReusableHeaderFooterView<T: UITableViewHeaderFooterView>(_: T.Type) where T: Reusable {
+    if let nib = T.nib {
+        self.register(nib, forHeaderFooterViewReuseIdentifier: T.reuseIdentifier)
+    } else {
+        self.register(T.self, forHeaderFooterViewReuseIdentifier: T.reuseIdentifier)
+    }
+  }
+
+    func dequeueReusableHeaderFooterView<T: UITableViewHeaderFooterView>() -> T where T: Reusable {
+        return self.dequeueReusableHeaderFooterView(withIdentifier: T.reuseIdentifier) as! T
+  }
+}

CheoMooRac/CheoMooRac/Sources/Exensions/UIView+addSubviews.swift

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+//
+//  UIView+addSubviews.swift
+//  CheoMooRac
+//
+//  Created by 김윤서 on 2021/09/14.
+//
+
+import UIKit
+
+extension UIView {
+    func addSubviews(_ views: UIView...) {
+        for view in views { addSubview(view) }
+    }
+}