我在Storyboard中创建了一个新的ViewController。将它连接到ListViewController。ListViewController将正确的数据填充到aboutDict[String:Any]。构建了fileURLs[]并调用了funcnumberOfPreviewItems(in:QLPreviewController)->Int-调试器显示fileURLs[]是预期:Printingdescriptionofself.fileURLs:▿1element-0:file:///Users/kent/Library/Developer/CoreSimulator/