[CM-1317] add rendering mode support (#60)

* [ISSUE] add rendering mode support

* [UPDATE] added lint rule as in new swiftLint we get warnings even for disabled rules for file

[UPDATE] add disable rule

* [UPDATE] reenabled function length rule

[UPDATE] added     // swiftlint:disable superfluous_disable_command

* [UPDATE] review comments resolved

* [UPDATE] rendering default is .automatic

* Update UIView+constrainEdgesTests.swift

* Update UIView+constrainEdgesTests.swift

* [CM-1317] Update documentation and unit tests

---------

Co-authored-by: Mark Pospesel <mark.pospesel@ymedialabs.com>

Sources/YCoreUI/Extensions/UIKit/UIColor+rgbComponents.swift

@@ -29,3 +29,4 @@ public extension UIColor {
         return (red, green, blue, alpha)
     }
 }
+// swiftlint: enable large_tuple

Sources/YCoreUI/Protocols/SystemImage.swift

@@ -14,46 +14,29 @@ import UIKit
 ///  to `SystemImage`.  The raw value of the enum should match a sytem image name (e.g. `checkmark.seal`).
 public protocol SystemImage: RawRepresentable where RawValue == String {
     /// Fallback image to use in case a system image cannot be loaded.
-    /// (default is a 16 x 16 square filled with `.systemPink`)
     static var fallbackImage: UIImage { get }
 
     /// A system image for this name value.
-    ///
-    /// Default implementation calls `loadImage` and nil-coalesces to `fallbackImage`.
     var image: UIImage { get }
 
     /// Image will scale according to the specified text style.
     ///
-    /// Default implementation is `.body`.
+    /// Return `nil` to not have the system image scale (not recommended).
     static var textStyle: UIFont.TextStyle? { get }
 
-    /// Image configuration to be used in `loadImage()`.
-    ///
-    /// Default implementation is `UIImage.SymbolConfiguration(textStyle: textStyle)`.
-    /// Returns `nil` when `textStyle` is `nil`.
+    /// Image configuration to be used to load the system image.
     static var configuration: UIImage.Configuration? { get }
 
+    /// Rendering mode to use for the system image.
+    static var renderingMode: UIImage.RenderingMode { get }
+
     /// Loads the named system image.
     /// - Returns: The named system image or else `nil` if the system image cannot be loaded.
     func loadImage() -> UIImage?
 }
 
 extension SystemImage {
-    /// Image will scale according to the specified text style.
-    public static var textStyle: UIFont.TextStyle? { .body }
-
-    /// Image configuration to be used in `loadImage()`.
-    ///
-    /// Returns `nil` when `textStyle` is `nil`.
-    public static var configuration: UIImage.Configuration? {
-        guard let textStyle = textStyle else {
-            return nil
-        }
-        return UIImage.SymbolConfiguration(textStyle: textStyle)
-    }
-
-    /// Fallback image to use in case a system image cannot be loaded.
-    /// (default is a 16 x 16 square filled with `.systemPink`)
+    /// Returns a 16 x 16 square filled with `.systemPink`.
     public static var fallbackImage: UIImage {
         let renderer = UIGraphicsImageRenderer(size: CGSize(width: 16, height: 16))
         let image = renderer.image { ctx in
@@ -63,17 +46,28 @@ extension SystemImage {
         return image
     }
 
-    /// Loads the named system image.
-    ///
-    /// Default implementation uses `UIImage(systemName:)` passing in the associated `rawValue`.
-    /// - Returns: The named system image or else `nil` if the system image cannot be loaded.
+    /// Returns `.body` text style.
+    public static var textStyle: UIFont.TextStyle? { .body }
+
+    /// Returns `UIImage.SymbolConfiguration(textStyle:)`
+    /// passing in the specified `textStyle` or else returns `nil` if `textStyle` is `nil`.
+    public static var configuration: UIImage.Configuration? {
+        guard let textStyle = textStyle else {
+            return nil
+        }
+        return UIImage.SymbolConfiguration(textStyle: textStyle)
+    }
+
+    /// Returns `.automatic` rendering mode.
+    public static var renderingMode: UIImage.RenderingMode { .automatic }
+
+    /// Returns `UIImage(systemName:)` passing in the associated `rawValue` and `configuration`
+    /// and combined with the specified `renderingMode`.
     public func loadImage() -> UIImage? {
-        UIImage(systemName: rawValue, withConfiguration: Self.configuration)
+        UIImage(systemName: rawValue, withConfiguration: Self.configuration)?.withRenderingMode(Self.renderingMode)
     }
 
-    /// A system image for this name value.
-    ///
-    /// Default implementation calls `loadImage` and nil-coalesces to `fallbackImage`.
+    /// Returns `loadImage()` nil-coalesced to `fallbackImage`.
     public var image: UIImage {
         guard let image = loadImage() else {
             if YCoreUI.isLoggingEnabled {

Tests/YCoreUITests/Extensions/Foundation/CGFloat+roundedTests.swift

@@ -10,7 +10,7 @@ import XCTest
 @testable import YCoreUI
 
 // Large tuples help us build unit test expectations concisely
-// swiftlint:disable large_tuple
+// swiftlint: disable large_tuple
 
 final class CGFloatRoundedTests: XCTestCase {
     typealias ScalingInputs = (
@@ -75,3 +75,4 @@ final class CGFloatRoundedTests: XCTestCase {
         }
     }
 }
+// swiftlint: enable large_tuple

Tests/YCoreUITests/Extensions/UIKit/UIColor+WCAGTests.swift

@@ -10,7 +10,7 @@ import XCTest
 @testable import YCoreUI
 
 // Large tuples help us build unit test expectations concisely
-// swiftlint:disable large_tuple
+// swiftlint: disable large_tuple
 
 final class UIColorWCAGTests: XCTestCase {
     typealias ColorInputs = (foreground: UIColor, background: UIColor, context: WCAGContext)
@@ -183,3 +183,4 @@ final class UIColorWCAGTests: XCTestCase {
         XCTAssertEqual(round(ratio1 * 100) / 100, round(ratio2 * 100) / 100)
     }
 }
+// swiftlint: enable large_tuple

Tests/YCoreUITests/Extensions/UIKit/UIColor+rgbValueTests.swift

@@ -10,7 +10,7 @@ import XCTest
 @testable import YCoreUI
 
 // Large tuples help us build unit test expectations concisely
-// swiftlint:disable large_tuple
+// swiftlint: disable large_tuple
 
 final class UIColorRgbValueTests: XCTestCase {
     typealias ColorTest = (color: UIColor, prefix: String?, isUppercase: Bool, output: String)
@@ -75,3 +75,4 @@ final class UIColorRgbValueTests: XCTestCase {
         YCoreUI.isLoggingEnabled = true
     }
 }
+// swiftlint: enable large_tuple

Tests/YCoreUITests/Protocols/SystemImageTests.swift

@@ -32,7 +32,11 @@ final class SystemImageTests: XCTestCase {
 
         YCoreUI.isLoggingEnabled = true
     }
-
+
+    func test_systemImage_deliversDefaultFallback() {
+        XCTAssertEqual(DefaultSymbols.defaultCase.image.pngData(), DefaultSymbols.fallbackImage.pngData())
+    }
+
     func test_defaultImageScaling() {
         XCTAssertEqual(Symbols.textStyle, .body)
         XCTAssertEqual(Symbols.configuration, UIImage.SymbolConfiguration(textStyle: .body))
@@ -47,9 +51,15 @@ final class SystemImageTests: XCTestCase {
         XCTAssertEqual(SymbolCustomScaling.textStyle, .title1)
         XCTAssertEqual(SymbolCustomScaling.configuration, UIImage.SymbolConfiguration(textStyle: .title1))
     }
-
-    func test_systemImage_deliversDefaultFallback() {
-        XCTAssertEqual(DefaultSymbols.defaultCase.image.pngData(), DefaultSymbols.fallbackImage.pngData())
+
+    func test_defaultRenderingMode() {
+        XCTAssertEqual(Symbols.renderingMode, .automatic)
+    }
+
+    func test_customRenderingMode() {
+        SymbolCustomRenderingMode.allCases.forEach {
+            XCTAssertEqual($0.image.renderingMode, .alwaysOriginal)
+        }
     }
 }
 
@@ -88,4 +98,12 @@ extension SystemImageTests {
 
         static var textStyle: UIFont.TextStyle? { .title1 }
     }
+
+    enum SymbolCustomRenderingMode: String, CaseIterable, SystemImage {
+        case plus
+        case minus
+        case trash
+
+        static var renderingMode: UIImage.RenderingMode { .alwaysOriginal }
+    }
 }