iOS:fix cannot change rootView's layoutconfig or size

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

@@ -125,7 +125,8 @@ - (void)doricLayoutSubviews {
     if ([self.superview requestFromSubview:self]) {
         [self.superview doricLayoutSubviews];
     } else {
-        [self layoutSelf:CGSizeMake(self.width, self.height)];
+        CGSize size = [self measureSize:CGSizeMake(self.superview.width, self.superview.height)];
+        [self layoutSelf:size];
     }
 }
 

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

@@ -378,6 +378,9 @@ - (NSDictionary *)getLocationOnScreen {
 }
 
 - (void)blendLayoutConfig:(NSDictionary *)params {
+    if (!self.layoutConfig) {
+        self.view.layoutConfig = [DoricLayoutConfig new];
+    }
     [params[@"widthSpec"] also:^(NSNumber *it) {
         if (it) {
             self.layoutConfig.widthSpec = (DoricLayoutSpec) [it integerValue];