At WWDC 2019, Apple released iOS 13 with a host of new enhancements and features. In particular, the feature to swipe through the keys on the virtual keyboard to enter text is one of the small but noticeable updates.
This new feature called QuickPath allows users to swipe through the keys on the virtual keyboard to enter text. If you've ever used the SwiftKey keyboard application, you probably won't be surprised with this feature. So far, only third-party applications support finger swipe to enter text. But from iOS 13 with QuickPath users do not need to install a 3rd party keyboard application anymore.
Touching the keys instead of clicking is increasingly becoming a popular input method, especially on Android devices. This input method is faster and more convenient when users only need to use one hand.
Many of Apple's QuickPath capabilities will also be able to learn users' typing habits to gradually improve the accuracy of the Swype or SwiftKey ever provided.
It is currently unknown whether QuickPath on iOS 13 supports Vietnamese. SwiftKey keyboard app for Android has Vietnamese support and works relatively well so hopefully Apple will provide Vietnamese users with similar experience.