RazzleDazzle是IFTTT开源的一个iOS帧动画框架，用Swift编写，非常适用于APP初次使用时的介绍和引导信息。RazzleDazzle由IFTTT此前开源的一款Objective-C滚动帧动画库JazzHands发展而来。JazzHands是UIKit一个简单的关键帧基础动画框架，可通过手势、scrollview、KVO或者ReactiveCocoa控制动画，被IFTTT应用在IFTTT for iPhone上。多款知名应用程序都使用了JazzHands这个框架，目前其在github上有3688个star。对于RazzleDazzle，开发者除了使用RazzleDazzle支持的动画类型外，还可以使用自定义动画类型。

RazzleDazzle支持的动画类型：

• AlphaAnimationanimates thealphaproperty (creates fade effects).

• BackgroundColorAnimationanimates thebackgroundColorproperty.

• RotationAnimationanimates a rotation transform (for rotation effects).

• ScaleAnimationapplies a scaling transform (to scale view sizes).

• TranslationAnimationapplies a translation transform (to translate view position).

• CornerRadiusAnimationanimates thelayer.cornerRadiusproperty.

• HideAnimation animates the hidden property (hides and shows views).

• LayerStrokeStartAnimationanimates thestrokeStartproperty of aCAShapeLayer(does not work with LayerStrokeEndAnimation).

• LayerStrokeEndAnimationanimates thestrokeEndproperty of aCAShapeLayer(does not work with LayerStrokeStartAnimation).

• LayerFillColorAnimationanimates thefillColorproperty of aCAShapeLayer.

• LayerStrokeColorAnimationanimates thestrokeColorproperty of aCAShapeLayer.

• PathPositionAnimationanimates thelayer.positionproperty of aUIViewalong a path.

• LabelTextColorAnimationanimates thetextColorproperty of aUILabel.

• ConstraintConstantAnimationanimates anAutoLayoutconstraint constant.

• ConstraintMultiplierAnimationanimates anAutoLayoutconstraint constant as a multiple of an attribute of another view (to offset or resize views based on another view's size)

• ScrollViewPageConstraintAnimationanimates anAutoLayoutconstraint constant to place a view on a scroll view page (to position views on a scrollView using AutoLayout). This is the animation doing the heavy lifting forAnimatedPagingScrollViewController'skeepView(view: onPage:)function.