Hello, world! I haven't been writing blog posts for a long time. The reason why I had given up blogging is that currently there are no blog systems fulfill all my needs. I tried to get used to Medium. I love its reply system -- which guides people to write a new post instead of a simple comment…

Case Study: Intervening UIScrollView Instances's Pan Gesture Recognizer As we known, UIScrollView translates pan gesture signals into scrollViewDidXXX: messages and sends to its delegate, most of the time you only have to understand the relationships between the pan gesture signals and the…