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YZAudioCountDownView

仿抖音卡节拍

YTPressRecordView

YTDragCollectionLayout

CollectionView拖动排序和删除

YTSubmitButton

动画提交按钮

YTScratchyCard

刮刮卡

YTSliderView

YTSubmitButton_Swift

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YTHSVColorPicker

HSVColorPicker

TimerAndObserver

NSTimer和Observer自动释放

SectionHeaderChange

仿微信通讯录组头效果

TransitionAndInteraction

转场动画实现抽屉效果