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SodaLive/Sources/Extensions/StringExtension.swift

@@ -0,0 +1,43 @@
+//
+//  StringExtension.swift
+//  yozm
+//
+//  Created by klaus on 2022/06/03.
+//
+
+import Foundation
+
+extension Optional where Wrapped == String {
+    func isNullOrBlank() -> Bool {
+        return self == nil || self!.trimmingCharacters(in: .whitespaces).isEmpty
+    }
+}
+
+extension String {
+    func convertDateFormat(from: String, to: String) -> String {
+        let fromFormatter = DateFormatter()
+        fromFormatter.dateFormat = from
+        fromFormatter.timeZone = TimeZone(identifier: TimeZone.current.identifier)
+        
+        if let date = fromFormatter.date(from: self) {
+            return date.convertDateFormat(dateFormat: to)
+        } else {
+            return self
+        }
+    }
+    
+    func substring(from: Int, to: Int) -> String {
+        guard from < count, to >= 0, to - from >= 0 else {
+            return ""
+        }
+        
+        // Index 값 획득
+        let startIndex = index(self.startIndex, offsetBy: from)
+        let endIndex = index(self.startIndex, offsetBy: to + 1) // '+1'이 있는 이유: endIndex는 문자열의 마지막 그 다음을 가리키기 때문
+        
+        // 파싱
+        return String(self[startIndex ..< endIndex])
+        
+        // 출처 - https://ios-development.tistory.com/379
+    }
+}