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♻️ :: Move factory methods to private extensions on their actual types

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This commit is contained in:
Felix Mau
2021-10-02 13:36:47 +02:00
parent 74753892d4
commit 3304f9bb7c
1 changed files with 19 additions and 24 deletions
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GradientLoadingBar/Classes/ViewModel/GradientActivityIndicatorViewModel.swift
+19 -24
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@@ -77,9 +77,12 @@ final class GradientActivityIndicatorViewModel {
/// Color array used for the gradient (of type `UIColor`).
var gradientColors = UIColor.GradientLoadingBar.gradientColors {
didSet {
gradientLayerColorsSubject.value = makeGradientLayerColors()
let gradientLayerColors = ColorLocationRow.gradientLayerColors(from: gradientColors)
gradientLayerColorsSubject.value = gradientLayerColors
let gradientLocationMatrix = ColorLocationMatrix.colorLocationMatrix(gradientColorsQuantity: gradientColors.count,
gradientLayerColorsQuantity: gradientLayerColors.count)
let gradientLocationMatrix = makeColorLocationMatrix()
colorLocationInitialRowSubject.value = gradientLocationMatrix[0]
colorLocationMatrixSubject.value = gradientLocationMatrix
}
@@ -114,36 +117,26 @@ final class GradientActivityIndicatorViewModel {
// MARK: - Initializer
init() {
let gradientLayerColors = Self.makeGradientLayerColors(from: gradientColors)
let gradientLocationMatrix = Self.makeColorLocationMatrix(gradientColorsQuantity: gradientColors.count,
gradientLayerColorsQuantity: gradientLayerColors.count)
let gradientLayerColors = ColorLocationRow.gradientLayerColors(from: gradientColors)
let gradientLocationMatrix = ColorLocationMatrix.colorLocationMatrix(gradientColorsQuantity: gradientColors.count,
gradientLayerColorsQuantity: gradientLayerColors.count)
gradientLayerColorsSubject = Variable(gradientLayerColors)
colorLocationInitialRowSubject = Variable(gradientLocationMatrix[0])
colorLocationMatrixSubject = Variable(gradientLocationMatrix)
}
}
// MARK: - Private methods
/// Forward calls to the static factory method `makeGradientLayerColors(from:)` by providing the required parameters.
private func makeGradientLayerColors() -> [CGColor] {
Self.makeGradientLayerColors(from: gradientColors)
}
/// Forward calls to the static factory method `makeColorLocationMatrix(gradientColorsQuantity:gradientLayerColorsQuantity:)`
/// by providing the required parameters.
private func makeColorLocationMatrix() -> ColorLocationMatrix {
Self.makeColorLocationMatrix(gradientColorsQuantity: gradientColors.count,
gradientLayerColorsQuantity: gradientLayerColorsSubject.value.count)
}
// MARK: - Helpers
private extension ColorLocationRow {
/// Generates the colors used on the gradient-layer.
///
/// Example for `gradientColors = [.red, .yellow, .green, .blue]`
/// and therefore `gradientLayerColors = [.red, .yellow, .green, .blue, .green, .yellow, .red, .yellow, .green, .blue]`
///
/// - Note: Declared `static` so we can call this method from the initializer, before `self` is available.
private static func makeGradientLayerColors(from gradientColors: [UIColor]) -> [CGColor] {
static func gradientLayerColors(from gradientColors: [UIColor]) -> [CGColor] {
// Simulate infinite animation - Therefore we'll reverse the colors and remove the first and last item
// to prevent duplicate values at the "inner edges" destroying the infinite look.
let reversedColors = gradientColors
@@ -154,7 +147,9 @@ final class GradientActivityIndicatorViewModel {
let infiniteGradientColors = gradientColors + reversedColors + gradientColors
return infiniteGradientColors.map { $0.cgColor }
}
}
private extension ColorLocationMatrix {
/// Generates a single row for the locations-matrix used for animating the current `gradientColors`.
///
/// Example for `index = 0`
@@ -166,7 +161,7 @@ final class GradientActivityIndicatorViewModel {
/// ```
///
/// - Note: Declared `static` so we can call this method from the initializer, before `self` is available.
private static func makeColorLocationRow(index: Int, gradientColorsQuantity: Int, gradientLayerColorsQuantity: Int) -> ColorLocationRow {
private static func colorLocationRow(index: Int, gradientColorsQuantity: Int, gradientLayerColorsQuantity: Int) -> ColorLocationRow {
let startLocationsQuantity = gradientLayerColorsQuantity - gradientColorsQuantity - index
let startLocations = [NSNumber](repeating: 0.0, count: startLocationsQuantity)
@@ -201,14 +196,14 @@ final class GradientActivityIndicatorViewModel {
/// ```
///
/// - Note: Declared `static` so we can call this method from the initializer, before `self` is available.
private static func makeColorLocationMatrix(gradientColorsQuantity: Int, gradientLayerColorsQuantity: Int) -> ColorLocationMatrix {
static func colorLocationMatrix(gradientColorsQuantity: Int, gradientLayerColorsQuantity: Int) -> ColorLocationMatrix {
let matrixHeight = gradientLayerColorsQuantity - gradientColorsQuantity + 1
let range = 0 ..< matrixHeight
return range.reduce(into: ColorLocationMatrix(repeating: [], count: matrixHeight)) { gradientLocationMatrix, row in
gradientLocationMatrix[row] = Self.makeColorLocationRow(index: row,
gradientColorsQuantity: gradientColorsQuantity,
gradientLayerColorsQuantity: gradientLayerColorsQuantity)
gradientLocationMatrix[row] = Self.colorLocationRow(index: row,
gradientColorsQuantity: gradientColorsQuantity,
gradientLayerColorsQuantity: gradientLayerColorsQuantity)
}
}
}