Add copying

OTP/Views/KeyView.swift

@@ -11,8 +11,9 @@ import OTPKit
 struct KeyView: View {
     let key: TOTPKey
     let currentCode: TOTPCode
+    @State private var copying = false
     
-    var formattedCode: String {
+    private var formattedCode: String {
         let code = currentCode.code
         let mid = code.index(code.startIndex, offsetBy: code.count / 2)
         return "\(code[code.startIndex..<mid]) \(code[mid...])"
@@ -24,6 +25,7 @@ struct KeyView: View {
     }
     
     var body: some View {
+        Button(action: self.copy) {
             HStack {
                 VStack(alignment: .leading) {
                     Text(key.issuer)
@@ -37,8 +39,16 @@ struct KeyView: View {
                 
                 Spacer()
                 
+
+                if copying {
+                    Text("Copied!")
+                        .font(.title2)
+                        .transition(.move(edge: .trailing).combined(with: .opacity))
+                } else {
                     Text(formattedCode)
                         .font(.system(.title2, design: .monospaced))
+                        .transition(.asymmetric(insertion: .move(edge: .trailing), removal: .move(edge: .leading)).combined(with: .opacity))
+                }
                 
     //            Text("\(currentCode.validUntil, style: .relative)")
     //                .font(.body.monospacedDigit())
@@ -53,15 +63,26 @@ struct KeyView: View {
                     }
                     .frame(width: 30)
                 }
-            
             }
         }
+        .tint(.black)
+    }
     
     private func progress(at date: Date) -> Double {
         let seconds = round(date.timeIntervalSince(currentCode.validFrom))
         let progress = 1 - seconds / Double(key.period)
         return progress
     }
+    
+    private func copy() {
+        UIPasteboard.general.string = currentCode.code
+        withAnimation(.easeInOut(duration: 0.5)) {
+            copying = true
+        }
+        withAnimation(.easeInOut(duration: 0.5).delay(0.65)) {
+            copying = false
+        }
+    }
 }
 
 struct KeyView_Previews: PreviewProvider {