如何实现像微信聊天下拉加载呢？

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如何实现像微信聊天下拉加载呢？How to implement drop-down loading like WeChat chat?

When I pull down and load, I directly render the stitched data every time, and then I run to the first one of the new data. When I have a way to do imaging wechat chat and load historical messages, I pull down, load symbols, and new data stitching (the key wheel doesn't slide). I have used scroll view, but I can't achieve the desired effect. My logic is that wxml is divided into two parts Pre loading 0-9 data, secondary loading 10-19 data hiding, but behind no idea, there are similar code can give me a reference? Thank you guys!!!

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