The progress ring function of the custom background image uses the principle of picture shielding to make the color of the progress ring more diverse...
A simple integrated version of iOS 13 Compositional Layout, modified into a way similar to Functional Programming to generate UICollectionViewCompositionalLayout.
Third-party login integration, as for the parameter values in the program, and the related setting values of info.plist, please refer to each developer platform.
The enhanced version of UIImagePickerController made by AVFoundation, with higher customization functions, is more convenient when using the camera to take photos.