Swift5 IAP Code=0 "无法连接到iTunes Store"

The "Cannot connect to iTunes Store" issue may be due to one or more of the following reasons:

• The sandbox may be unreachable. Check the System Status for the status of the iTunes Sandbox.
• Your app does not have a bundle version (CFBundleVersion). See Setting the Version Number and Build String for more information.
• Your app is running in the Simulator, which does not support in-app purchase.
• You are attempting to purchase a product that is unavailable for sale. See Query the App Store for product information before presenting your app’s store UI for more information.

经过排查，发现项目虽然填写了build值，但是plist文件的Bundle Version字段丢失了值。

image.png

填上对应的数值后，再进行测试，就没有问题了。

附录：

In-App Purchase FAQ
SKError.Code
The status of the app receipt