[YogaKit] support macOS.

YogaKit/YogaKitSample/YogaKitOSXSample/ViewController.m

@@ -0,0 +1,68 @@
+//
+//  ViewController.m
+//  YogaKitOSXSample
+//
+//  Created by lvv on 2020/8/13.
+//  Copyright © 2020 facebook. All rights reserved.
+//
+
+#import "ViewController.h"
+@import YogaKit;
+
+@implementation ViewController
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+    
+    NSView *root = self.view;
+    root.wantsLayer = YES;
+    root.layer.backgroundColor = NSColor.whiteColor.CGColor;
+    [root configureLayoutWithBlock:^(YGLayout * _Nonnull layout) {
+        layout.isEnabled = YES;
+        layout.alignItems = YGAlignCenter;
+        layout.justifyContent = YGJustifyCenter;
+    }];
+
+    NSView *child1 = [[NSView alloc] init];
+    child1.wantsLayer = YES;
+    child1.layer.backgroundColor = NSColor.blueColor.CGColor;
+    [child1 configureLayoutWithBlock:^(YGLayout * _Nonnull layout) {
+        layout.isEnabled = YES;
+        layout.width = YGPointValue(100);
+        layout.height = YGPointValue(10);
+        layout.marginBottom = YGPointValue(25);
+    }];
+    [root addSubview:child1];
+
+    NSView *child2 = [[NSView alloc] init];
+    child2.wantsLayer = YES;
+    child2.layer.backgroundColor = NSColor.greenColor.CGColor;
+    [child2 configureLayoutWithBlock:^(YGLayout * _Nonnull layout) {
+        layout.isEnabled = YES;
+        layout.alignSelf = YGAlignFlexEnd;
+        layout.width = YGPointValue(200);
+        layout.height = YGPointValue(200);
+    }];
+    [root addSubview:child2];
+
+    NSView *child3 = [[NSView alloc] init];
+    child3.wantsLayer = YES;
+    child3.layer.backgroundColor = NSColor.yellowColor.CGColor;
+    [child3 configureLayoutWithBlock:^(YGLayout * _Nonnull layout) {
+        layout.isEnabled = YES;
+        layout.alignSelf = YGAlignFlexStart;
+        layout.width = YGPointValue(100);
+        layout.height = YGPointValue(100);
+    }];
+    [root addSubview:child3];
+}
+
+
+- (void)setRepresentedObject:(id)representedObject {
+    [super setRepresentedObject:representedObject];
+
+    // Update the view, if already loaded.
+}
+
+
+@end