Windows下Xamarin.iOS xib无法调整大小问题

开发环境windows10,Visual Studio 2017

Simulated Metrics Size 选择Freeform，按道理此时xib中View应该可以自定义大小，但是实际上是不行的。

使用代码编辑器打开xib文件，查看源码中有这样一行代码：<size key="freeformSize" width="414" height="736"/>，删除其中的width和height即可。

 1 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 <document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="13771" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES">
 3     <dependencies>
 4         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13772"/>
 5         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 6     </dependencies>
 7     <objects>
 8         <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
 9         <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
10         <view contentMode="scaleToFill" id="1">
11             <rect key="frame" x="0.0" y="0.0" width="414" height="736"/>
12             <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
13             <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
14             <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
15             <size key="freeformSize" width="414" height="736"/>
16         </view>
17     </objects>
18     <resources>
19         <image name="ITunesArtwork" width="512" height="512"/>
20         <image name="ITunesArtwork@2x" width="512" height="512"/>
21         <image name="photo.png" width="96" height="96"/>
22     </resources>
23 </document>