梦幻星空动画

效果如下图:

效果是别人做的,非本人所写,本人只是分析下实现原理而已:)

代码原理:

1. 所有的View都将backedLayer替换成了粒子Layer

 

2. 粒子随着路径运动的动画代码如下,keyPath很少见哦,粒子的位置,学习了.

 

3. 爆炸效果如何产生的?

LYFireworksView.m

 

附录:

CAEmitterCell的一些可以动画的属性:

这么多可供动画用参数,应该可以实现非常复杂的效果吧.

 

/* The name of the cell. Used to construct key paths. Defaults to nil. */

@property(copy) NSString *name; /* Controls whether or not cells from this emitter are rendered. */ @property(getter=isEnabled) BOOL enabled; /* The number of emitted objects created every second. Default value is  * zero. Animatable. */ @property float birthRate; /* The lifetime of each emitted object in seconds, specified as a mean  * value and a range about the mean. Both values default to zero.  * Animatable. */ @property float lifetime, lifetimeRange; /* The orientation of the emission angle in radians, relative to the  * natural orientation angle of the emission shape. Note that latitude  * here is what is typically called colatitude, the zenith or phi, the  * angle from the z-axis. Similarly longitude is the angle in the  * xy-plane from the x-axis, often referred to as the azimuth or  * theta. Both values default to zero, which translates to no change  * relative to the emission shape's direction. Both values are  * animatable. */ @property CGFloat emissionLatitude, emissionLongitude; /* An angle (in radians) defining a cone around the emission angle.  * Emitted objects are uniformly distributed across this cone. Defaults  * to zero.  Animatable. */ @property CGFloat emissionRange; /* The initial mean velocity of each emitted object, and its range. Both  * values default to zero. Animatable. */ @property CGFloat velocity, velocityRange; /* The acceleration vector applied to emitted objects. Defaults to  * (0, 0, 0). Animatable. */ @property CGFloat xAcceleration, yAcceleration, zAcceleration; /* The scale factor applied to each emitted object, defined as mean and  * range about the mean. Scale defaults to one, range to zero.  * Animatable. */ @property CGFloat scale, scaleRange, scaleSpeed; /* The rotation speed applied to each emitted object, defined as mean  * and range about the mean. Defaults to zero. Animatable. */ @property CGFloat spin, spinRange; /* The mean color of each emitted object, and the range from that mean  * color. `color' defaults to opaque white, `colorRange' to (0, 0, 0,  * 0). Animatable. */ @property CGColorRef color; @property float redRange, greenRange, blueRange, alphaRange; /* The speed at which color components of emitted objects change over  * their lifetime, defined as the rate of change per second. Defaults  * to (0, 0, 0, 0). Animatable. */ @property float redSpeed, greenSpeed, blueSpeed, alphaSpeed; /* The cell contents, typically a CGImageRef. Defaults to nil.  * Animatable. */ @property(retain) id contents; /* The sub-rectangle of the contents image that will be drawn. See  * CALayer.h for more details. Defaults to the unit rectangle [0 0 1 1].  * Animatable. */ @property CGRect contentsRect; /* The filter parameters used when rendering the `contents' image. See  * CALayer.h for more details. */ @property(copy) NSString *minificationFilter, *magnificationFilter; @property float minificationFilterBias; /* An array containing the sub-cells of this cell, or nil (the default  * value). When non-nil each particle emitted by the cell will act as  * an emitter for each of the cell's sub-cells. The emission point is  * the current particle position and the emission angle is relative to  * the current direction of the particle. Animatable. */