该类存放在CAAnimation.h文件中
Super class
@interface CAKeyframeAnimation : CAPropertyAnimation
Attribute
- 属性值数组
/* An array of objects providing the value of the animation function for
* each keyframe. */
@property(nullable, copy) NSArray *values;
- 动画路径
/* An optional path object defining the behavior of the animation
* function. When non-nil overrides the `values' property. Each point
* in the path except for `moveto' points defines a single keyframe for
* the purpose of timing and interpolation. Defaults to nil. For
* constant velocity animation along the path, `calculationMode' should
* be set to `paced'. Upon assignment the path is copied. */
@property(nullable) CGPathRef path;
源代码
/* An optional array of `NSNumber' objects defining the pacing of the
* animation. Each time corresponds to one value in the `values' array,
* and defines when the value should be used in the animation function.
* Each value in the array is a floating point number in the range
* [0,1]. */
@property(nullable, copy) NSArray<NSNumber *> *keyTimes;
/* An optional array of CAMediaTimingFunction objects. If the `values' array
* defines n keyframes, there should be n-1 objects in the
* `timingFunctions' array. Each function describes the pacing of one
* keyframe to keyframe segment. */
@property(nullable, copy) NSArray<CAMediaTimingFunction *> *timingFunctions;
/* The "calculation mode". Possible values are `discrete', `linear',
* `paced', `cubic' and `cubicPaced'. Defaults to `linear'. When set to
* `paced' or `cubicPaced' the `keyTimes' and `timingFunctions'
* properties of the animation are ignored and calculated implicitly. */
@property(copy) NSString *calculationMode;
/* For animations with the cubic calculation modes, these properties
* provide control over the interpolation scheme. Each keyframe may
* have a tension, continuity and bias value associated with it, each
* in the range [-1, 1] (this defines a Kochanek-Bartels spline, see
* http://en.wikipedia.org/wiki/Kochanek-Bartels_spline).
*
* The tension value controls the "tightness" of the curve (positive
* values are tighter, negative values are rounder). The continuity
* value controls how segments are joined (positive values give sharp
* corners, negative values give inverted corners). The bias value
* defines where the curve occurs (positive values move the curve before
* the control point, negative values move it after the control point).
*
* The first value in each array defines the behavior of the tangent to
* the first control point, the second value controls the second
* point's tangents, and so on. Any unspecified values default to zero
* (giving a Catmull-Rom spline if all are unspecified). */
@property(nullable, copy) NSArray<NSNumber *> *tensionValues;
@property(nullable, copy) NSArray<NSNumber *> *continuityValues;
@property(nullable, copy) NSArray<NSNumber *> *biasValues;
/* Defines whether or objects animating along paths rotate to match the
* path tangent. Possible values are `auto' and `autoReverse'. Defaults
* to nil. The effect of setting this property to a non-nil value when
* no path object is supplied is undefined. `autoReverse' rotates to
* match the tangent plus 180 degrees. */
@property(nullable, copy) NSString *rotationMode;
@end
