Move send amount validation to view model #4108

AlphaWallet/Transfer/ViewControllers/SendViewController.swift

@@ -55,7 +55,7 @@ class SendViewController: UIViewController {
     private let tokensDataStore: TokensDataStore
     @objc private (set) dynamic var isAllFunds: Bool = false
     private var observation: NSKeyValueObservation!
-
+    
     private lazy var containerView: ScrollableStackView = {
         let view = ScrollableStackView()
         return view
@@ -181,15 +181,8 @@ class SendViewController: UIViewController {
         let input = targetAddressTextField.value.trimmed
         targetAddressTextField.errorState = .none
         amountTextField.errorState = .none
-        let checkIfGreaterThanZero: Bool
-        switch transactionType {
-        case .nativeCryptocurrency, .dapp, .tokenScript, .claimPaidErc875MagicLink:
-            checkIfGreaterThanZero = false
-        case .erc20Token, .erc875Token, .erc875TokenOrder, .erc721Token, .erc721ForTicketToken, .erc1155Token:
-            checkIfGreaterThanZero = true
-        }
 
-        guard let value = viewModel.validatedAmount(value: amountTextField.ethCost, checkIfGreaterThanZero: checkIfGreaterThanZero) else {
+        guard let value = viewModel.validatedAmount(value: amountTextField.ethCost, checkIfGreaterThanZero: viewModel.checkIfGreaterThanZero) else {
             amountTextField.errorState = .error
             return
         }

AlphaWallet/Transfer/ViewModels/SendViewModel.swift

@@ -120,6 +120,15 @@ struct SendViewModel {
         return true
     }
 
+    var checkIfGreaterThanZero: Bool {
+        switch transactionType {
+        case .nativeCryptocurrency, .dapp, .tokenScript, .claimPaidErc875MagicLink:
+            return false
+        case .erc20Token, .erc875Token, .erc875TokenOrder, .erc721Token, .erc721ForTicketToken, .erc1155Token:
+            return true
+        }
+    }
+
     var allFundsFormattedValues: (allFundsFullValue: NSDecimalNumber?, allFundsShortValue: String)? {
         switch transactionType {
         case .nativeCryptocurrency: