iOS:fix space error when no child

doric-demo/src/ScrolledSliderDemo.ts

@@ -0,0 +1,151 @@
+import { Group, text, gravity, Color, LayoutSpec, vlayout, hlayout, layoutConfig, scroller, Text, ViewHolder, VMPanel, ViewModel, network, loge, HLayout, stack, image } from "doric";
+import { colors } from "./utils";
+
+interface DoubanModel {
+    count: number
+    start: number
+    total: number
+    subjects: Array<{
+        rating: {
+            max: number,
+            average: number,
+            details: {
+                "1": number,
+                "2": number,
+                "3": number,
+                "4": number,
+                "5": number,
+            },
+            stars: number
+            min: number,
+        }
+        genres: string[],
+        title: string
+        casts: Array<{
+            avatars: {
+                small: string,
+                large: string,
+                medium: string,
+            },
+            name_en: string
+            name: string
+            alt: string
+            id: string
+        }>
+        durations: string[]
+        collect_count: number
+        mainland_pubdate: string
+        has_video: boolean
+        original_title: string
+        subtype: string
+        directors: Array<{
+            avatars: {
+                small: string,
+                large: string,
+                medium: string,
+            },
+            name_en: string
+            name: string
+            alt: string
+            id: string
+        }>,
+        pubdates: string[],
+
+        year: string,
+        images: {
+            small: string,
+            large: string,
+            medium: string,
+        }
+        alt: string
+        id: string
+    }>
+    title: string
+}
+
+interface MovieModel {
+    doubanModel?: DoubanModel
+}
+
+class MovieVH extends ViewHolder {
+    title!: Text
+    gallery!: HLayout
+
+    build(root: Group) {
+        vlayout(
+            [
+                this.title = text({
+                    layoutConfig: {
+                        widthSpec: LayoutSpec.MOST,
+                        heightSpec: LayoutSpec.JUST,
+                    },
+                    textSize: 30,
+                    textColor: Color.WHITE,
+                    backgroundColor: colors[1],
+                    textAlignment: gravity().center(),
+                    height: 50,
+                }),
+                scroller(
+                    this.gallery = hlayout(
+                        [],
+                        {
+                            layoutConfig: layoutConfig().most().configWidth(LayoutSpec.FIT),
+                            space: 100,
+                        }),
+                    {
+                        layoutConfig: layoutConfig().most().configHeight(LayoutSpec.JUST),
+                        height: 200,
+                        backgroundColor: Color.parse("#eeeeee"),
+                    })
+            ],
+            {
+                layoutConfig: layoutConfig().most(),
+                space: 50,
+            }).in(root)
+    }
+
+}
+
+class MovieVM extends ViewModel<MovieModel, MovieVH>{
+
+    onAttached() {
+        network(context).get("https://douban.uieee.com/v2/movie/top250").then(ret => {
+            this.updateState(state => state.doubanModel = JSON.parse(ret.data) as DoubanModel)
+        })
+    }
+    onBind(state: MovieModel, vh: MovieVH) {
+        if (state.doubanModel) {
+            vh.title.text = state.doubanModel.title
+            vh.gallery.children.length = 0
+            state.doubanModel.subjects.slice(0, 5).forEach(e => {
+                vh.gallery.addChild(stack(
+                    [
+                        image({
+                            layoutConfig: layoutConfig().just(),
+                            width: 100,
+                            height: 100,
+                            imageUrl: e.images.large
+                        })
+                    ],
+                    {
+                        backgroundColor: Color.YELLOW,
+                    }))
+            })
+        }
+    }
+}
+
+@Entry
+class SliderPanel extends VMPanel<MovieModel, MovieVH>{
+    getViewModelClass() {
+        return MovieVM
+    }
+    getViewHolderClass() {
+        return MovieVH
+    }
+
+    getState() {
+        return {}
+    }
+
+}

doric-iOS/Pod/Classes/Shader/DoricLayouts.m

@@ -393,7 +393,9 @@ - (CGSize)sizeThatFits:(CGSize)size {
         contentHeight = MAX(contentHeight, childSize.height + childConfig.margin.top + childConfig.margin.bottom);
         contentWeight += childConfig.weight;
     }
+    if (self.subviews.count > 0) {
         contentWidth -= self.space;
+    }
     self.contentWidth = contentWidth;
     self.contentHeight = contentHeight;
     self.contentWeight = contentWeight;