Added ErrorTextFieldValidator

Material.xcodeproj/project.pbxproj

@@ -180,6 +180,7 @@
 		9DF352421FED20C900B2A11B /* BaseIconLayerButton.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9DF352411FED20C900B2A11B /* BaseIconLayerButton.swift */; };
 		9DF352421FED20C900B2A11B /* BaseIconLayerButton.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9DF352411FED20C900B2A11B /* BaseIconLayerButton.swift */; };
 		9DF352441FED20ED00B2A11B /* RadioButton.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9DF352431FED20ED00B2A11B /* RadioButton.swift */; };
 		9DF352441FED20ED00B2A11B /* RadioButton.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9DF352431FED20ED00B2A11B /* RadioButton.swift */; };
 		9DF352461FED210000B2A11B /* CheckButton.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9DF352451FED210000B2A11B /* CheckButton.swift */; };
 		9DF352461FED210000B2A11B /* CheckButton.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9DF352451FED210000B2A11B /* CheckButton.swift */; };
+		9DF58CEE20C098C60098968D /* ErrorTextFieldValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9DF58CED20C098C60098968D /* ErrorTextFieldValidator.swift */; };
 /* End PBXBuildFile section */
 /* End PBXBuildFile section */
 
 
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 /* Begin PBXContainerItemProxy section */
@@ -297,6 +298,7 @@
 		9DF352411FED20C900B2A11B /* BaseIconLayerButton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BaseIconLayerButton.swift; sourceTree = "<group>"; };
 		9DF352411FED20C900B2A11B /* BaseIconLayerButton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BaseIconLayerButton.swift; sourceTree = "<group>"; };
 		9DF352431FED20ED00B2A11B /* RadioButton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RadioButton.swift; sourceTree = "<group>"; };
 		9DF352431FED20ED00B2A11B /* RadioButton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RadioButton.swift; sourceTree = "<group>"; };
 		9DF352451FED210000B2A11B /* CheckButton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CheckButton.swift; sourceTree = "<group>"; };
 		9DF352451FED210000B2A11B /* CheckButton.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CheckButton.swift; sourceTree = "<group>"; };
+		9DF58CED20C098C60098968D /* ErrorTextFieldValidator.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ErrorTextFieldValidator.swift; sourceTree = "<group>"; };
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@@ -315,6 +317,7 @@
 				96BCB79E1CB40DC500C806FE /* TextView.swift */,
 				96BCB79E1CB40DC500C806FE /* TextView.swift */,
 				96BCB79C1CB40DC500C806FE /* TextField.swift */,
 				96BCB79C1CB40DC500C806FE /* TextField.swift */,
 				961F18E71CD93E3E008927C5 /* ErrorTextField.swift */,
 				961F18E71CD93E3E008927C5 /* ErrorTextField.swift */,
+				9DF58CED20C098C60098968D /* ErrorTextFieldValidator.swift */,
 			);
 			);
 			name = Text;
 			name = Text;
 			sourceTree = "<group>";
 			sourceTree = "<group>";
@@ -1005,6 +1008,7 @@
 				965E80CE1DD4C50600D61E4B /* FABButton.swift in Sources */,
 				965E80CE1DD4C50600D61E4B /* FABButton.swift in Sources */,
 				965E80CF1DD4C50600D61E4B /* FlatButton.swift in Sources */,
 				965E80CF1DD4C50600D61E4B /* FlatButton.swift in Sources */,
 				965E80D01DD4C50600D61E4B /* RaisedButton.swift in Sources */,
 				965E80D01DD4C50600D61E4B /* RaisedButton.swift in Sources */,
+				9DF58CEE20C098C60098968D /* ErrorTextFieldValidator.swift in Sources */,
 				96A183631E0C6CE200083C30 /* FABMenu.swift in Sources */,
 				96A183631E0C6CE200083C30 /* FABMenu.swift in Sources */,
 				965E80D11DD4C50600D61E4B /* IconButton.swift in Sources */,
 				965E80D11DD4C50600D61E4B /* IconButton.swift in Sources */,
 				965E80D21DD4C50600D61E4B /* Color.swift in Sources */,
 				965E80D21DD4C50600D61E4B /* Color.swift in Sources */,

Sources/iOS/ErrorTextFieldValidator.swift

+//
+//  ErrorTextFieldValidator.swift
+//  Material
+//
+//  Created by Orkhan Alikhanov on 30/05/2018.
+//  Copyright © 2018 CosmicMind, Inc. All rights reserved.
+//
+
+import UIKit
+import Motion
+
+open class ErrorTextFieldValidator: NSObject {
+  public typealias ValidationClosure = (String) -> Bool
+  open var closures: [(code: ValidationClosure, msg: String)] = []
+  open weak var textField: ErrorTextField?
+  
+  open var autoValidationType: AutoValidationType = .default
+  open var autoValidateOnlyIfErrorIsShownOnce = true
+  open var isErrorShownOnce = false
+  
+  public init(textField: ErrorTextField) {
+    self.textField = textField
+    super.init()
+    
+    textField.addTarget(self, action: #selector(checkIfErrorHasGone), for: .editingChanged)
+  }
+  
+  @objc
+  private func checkIfErrorHasGone() {
+    guard let textField = textField else { return }
+    if autoValidateOnlyIfErrorIsShownOnce && !isErrorShownOnce { return }
+    
+    switch autoValidationType {
+    case .none: break
+    case .custom(let closure):
+      closure(textField)
+    case .default:
+        _  = textField.isValid() // will hide if needed
+    }
+  }
+  
+  open func isValid(deferred: Bool) -> Bool {
+    guard let textField = textField else { return false }
+    if !deferred { textField.isErrorRevealed = false }
+    for block in closures {
+      if !block.code(textField.text ?? "") {
+        if !deferred {
+          textField.error = block.msg
+          textField.isErrorRevealed = true
+          isErrorShownOnce = true
+        }
+        return false
+      }
+    }
+    return true
+  }
+  
+  @discardableResult
+  open func validate(msg: String, when code: @escaping ValidationClosure) -> Self {
+    closures.append((code, msg))
+    return self
+  }
+  
+  public enum AutoValidationType {
+    case none
+    case `default`
+    case custom((ErrorTextField) -> Void)
+  }
+}
+
+private var AssociatedInstanceKey: UInt8 = 0
+extension ErrorTextField {
+  open var validator: ErrorTextFieldValidator {
+    get {
+      return AssociatedObject.get(base: self, key: &AssociatedInstanceKey) {
+        return ErrorTextFieldValidator(textField: self)
+      }
+    }
+    set(value) {
+      AssociatedObject.set(base: self, key: &AssociatedInstanceKey, value: value)
+    }
+  }
+  
+  open func isValid(deferred: Bool = false) -> Bool {
+    return validator.isValid(deferred: deferred)
+  }
+}
+
+public extension ErrorTextFieldValidator {
+  @discardableResult
+  func email(msg: String) -> Self {
+    return regex(msg: msg, pattern: "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}")
+  }
+  
+  @discardableResult
+  func username(msg: String) -> Self {
+    return regex(msg: msg, pattern: "^[a-zA-Z0-9]+([_\\s\\-\\.\\']?[a-zA-Z0-9])*$")
+  }
+  
+  @discardableResult
+  func regex(msg: String, pattern: String) -> Self {
+    return validate(msg: msg) {
+      let pred = NSPredicate(format: "SELF MATCHES %@", pattern)
+      return pred.evaluate(with: $0)
+    }
+  }
+  
+  @discardableResult
+  func min(length: Int, msg: String, trimmingSet: CharacterSet? = .whitespacesAndNewlines) -> Self {
+    let trimmingSet = trimmingSet ?? .init()
+    return validate(msg: msg) {
+      $0.trimmingCharacters(in: trimmingSet).count >= length
+    }
+  }
+  
+  @discardableResult
+  func notEmpty(msg: String, trimmingSet: CharacterSet? = .whitespacesAndNewlines) -> Self {
+    let trimmingSet = trimmingSet ?? .init()
+    return validate(msg: msg) {
+      $0.trimmingCharacters(in: trimmingSet).isEmpty == false
+    }
+  }
+  
+  @discardableResult
+  func noWhitespaces(msg: String) -> Self {
+    return validate(msg: msg) {
+      $0.rangeOfCharacter(from: .whitespaces) == nil
+    }
+  }
+}
+