Add gap function in Flex class

Author: Skyline-23

Sources/Swift/FlexLayout.swift

@@ -1213,6 +1213,26 @@ public final class Flex {
         return self
     }
 
+    //
+    // MARK: Gap
+    //
+    
+    /**
+     Set paddings between views.
+    */
+    @discardableResult
+    public func setGap(_ gutter: Gutter, _ value: CGFloat) -> Flex {
+        switch gutter {
+        case .column:               
+            yoga.columnGap = value
+        case .row:                  
+            yoga.rowGap = value
+        case .all:
+            yoga.gap = value
+        }
+        return self
+    }
+    
     //
     // MARK: UIView Visual properties
     //
@@ -1416,6 +1436,12 @@ public final class Flex {
         case none
     }
 
+    public enum Gutter {
+        case column
+        case row
+        case all
+    }
+    
     /*public enum Overflow {
      /// Items that overflow
         case visible

Sources/YogaKit/include/YogaKit/YGLayout.h

@@ -115,6 +115,10 @@ typedef NS_OPTIONS(NSInteger, YGDimensionFlexibility) {
 // Yoga specific properties, not compatible with flexbox specification
 @property(nonatomic, readwrite, assign) CGFloat aspectRatio;
 
+@property(nonatomic, readwrite, assign) CGFloat columnGap;
+@property(nonatomic, readwrite, assign) CGFloat rowGap;
+@property(nonatomic, readwrite, assign) CGFloat gap;
+
 /**
  Get the resolved direction of this node. This won't be YGDirectionInherit
  */