enhance alignment fillWidth/fillHeight can custom set spacing for those

Author: iwecon

Demo/Demo/HVStackDemoViewController.swift

@@ -42,7 +42,7 @@ class HVStackDemoViewController: UIViewController {
 
         Spacer()
 
-        VStackView(distribution: .fillWidth(10)) {
+        VStackView(distribution: .fillWidth(spacing: 10)) {
 
             // view.stack.then (Inspired by Then [ https://github.com/devxoul/Then ])
             UILabel().stack.then { label in

Demo/Demo/WrapStackDemoViewController.swift

@@ -15,7 +15,7 @@ class WrapStackDemoViewController: UIViewController {
 
         // Do any additional setup after loading the view.
 
-        let vStack = VStackView(distribution: .fillWidth(10)) {
+        let vStack = VStackView(distribution: .fillWidth(spacing: 10)) {
             UILabel().stack.then {
                 $0.text = "StackKit"
                 $0.font = .systemFont(ofSize: 18, weight: .semibold)

Sources/StackKit/Enums.swift

@@ -17,7 +17,7 @@ public enum HStackDistribution {
 
     /// The height of subviews are equal. `The height of the VStack needs to be given.`
     /// set `nil` means autoSpacing
-    case fillHeight(_ spacing: CGFloat? = nil)
+    case fillHeight(spacing: CGFloat? = nil)
 
     /// The width and height of subviews are equal. `The size of the HStack needs to be given.`
     case fill
@@ -41,7 +41,7 @@ public enum VStackDistribution {
 
     /// The widths are all equal. `The width of the VStack needs to be given.`
     /// set `nil` means autoSpacing
-    case fillWidth(_ spacing: CGFloat? = nil)
+    case fillWidth(spacing: CGFloat? = nil)
 
     /// The widths and heights are all equal. `The size of the V Stack needs to be given.`
     case fill