A segment switcher with dynamic text mask effect

##Preview:

Indicator will bounce when progress less than 0 or larger than 1.

##Simple Usage:

You can create DynamicMaskSegmentSwitch by xib or programmatically.Then just fill the property named configure.

    let configure = DynamicMaskSegmentSwitchConfigure(highlightedColor: .orangeColor(), normalColor: .whiteColor(), items: ["首页","消息","发现","个人"])
    switcher.configure = configure

That's all!

You can tap the specific item,the indicator will move to target item.

You can also change the property named progress,the indicator will also move with progress.