介绍MDC滚动条标签组件，用于在滚动时提供额外信息，类似于路径上的时钟。提供了使用示例和两种实现方式：通过子类化MDC滚动视图控制器并设置滚动条标签，或者实现一个作为UI滚动条代理的应用视图控制器。
https://github.com/modocache/MDCScrollBarLabel
MDCScrollBarLabel 
An animated scroll bar to present extra information to the used when scrolling on a UIScrollView.
Y'know, like the clock on Path.
Screenshots
Usage
See the example application for usage.
Basically, you have two options. You can:
- Subclass MDCScrollBarViewController and set an MDCScrollBarLabel to its scrollBarLabel property.
- Implement a UIViewController which is a UIScrollBarDelegate, then call the fade in/out logic for the label as you'd like.
Or copy-paste the fade in/out and positioning logic and re-write the whole thing to better suit your needs.
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