Flutter_blue使用，IOS端运行崩溃的问题

报错提示：

This app has crashed because it attempted to access privacy-sensitive data without a usage description.  The app's Info.plist must contain an NSBluetoothAlwaysUsageDescription key with a string value explaining to the user how the app uses this data.

意思就是说，这个应用崩溃了，因为它试图在用户未允许的情况下访问隐私数据，如果要访问隐私数据，需要在Info.plist文件加上key为NSBluetoothAlwaysUsageDescription的权限。