如何检测WP7手机是否正在漫游(How to detect if WP7 phone is roaming)

 看起来您的旧配置已设置为启动屏幕图像的故事板，但现在在覆盖该文件夹时，它已被替换 
 
 打开Xcode并选中Go to General并检查启动屏幕配置，如下图所示： 
 
  
 
 删除启动屏幕文件条目，然后单击“使用资产目录”以获取启动图像源。 为启动屏幕目录生成所需的映像，您的代码应立即运行 
 
 改变之后应该是这样的： 
 
  

It looks like your older configuration is set to storyboard for the launch screen image, but now in overwriting the folder, it got replaced
 
Open your Xcode and check Go to General and check the launch screen configuration as shown in the image below:
 
 
Remove the launch screen file entry and click the 'Use Asset Catalog' for launch image source. Generate the required images for the launch screen catalog and your code should run now
 
After the change is should something like this: