complete ClipPath element on iOS

elements/Defs.js

@@ -80,11 +80,16 @@ class Defs extends Component{
     static Item = DefsItem;
     static Use = DefsUse;
 
+    shouldRender = false;
     getChildren = () => {
         return Children.map(this.props.children, child => {
             let {type} = child;
 
             if (type === LinearGradient || type === RadialGradient || type === ClipPath) {
+                if (type === ClipPath) {
+                    this.shouldRender = true;
+                }
+
                 return cloneElement(child, {
                     svgId: this.props.svgId
                 });
@@ -99,8 +104,9 @@ class Defs extends Component{
     };
 
     render() {
-        return <NativeGroup>
-            {this.getChildren()}
+        let children = this.getChildren();
+        return <NativeGroup opacity={this.shouldRender ? 1 : 0}>
+            {children}
         </NativeGroup>;
     }
 }