如何使用CAKeyframeAnimation用于Bouncing effect IOS

概述我创建此代码来创建CAKeyframeAnimation,但结果根本没有d跳 -(CAKeyframeAnimation *)keyframeBounceAnimationFrom:(NSValue *)from to:(NSValue *)to 我创建此代码来创建CAKeyframeAnimation,但结果根本没有d跳

-(CAKeyframeAnimation *)keyframeBounceAnimationFrom:(NSValue *)from                                                    to:(NSValue *)to                                         forKeypath:(Nsstring *)keyPath                                       withDuration:(CFTimeInterval)duration{    CAKeyframeAnimation * animation = [CAKeyframeAnimation animationWithKeyPath:keyPath];    NSMutableArray * valuesArray = [NSMutableArray array];    NSMutableArray * timeKeyArray = [NSMutableArray array];    [self createBounceFrom:from to:to Values:valuesArray keyTimes:timeKeyArray];    [animation setValues:valuesArray];    [animation setKeyTimes:timeKeyArray];    animation.duration = duration;    return animation;}-(voID)createBounceFrom:(NSValue *)from to:(NSValue *)to Values:(NSMutableArray *)values keyTimes:(NSMutableArray *)keyTimes{    CGPoint topoint= [to CGPointValue];    CGfloat offset = 60;    CGfloat duration = 1.0f;    NSUInteger numberOfOscillations= 4;    [values addobject:from];    [keyTimes addobject:[NSNumber numberWithfloat:0.0f]];    //============    //IDeally bouncing will depend from starting position to end poisiton as simulating real DumPing Oscillations    //============    for (NSUInteger index= 0; index <numberOfOscillations ; index++)    {        CGPoint viaPoint = CGPointMake(topoint.x,topoint.y + offset);        NSValue * via = [NSValue valueWithCGPoint:viaPoint];        [values addobject:via];        //add time consumed for each oscillation        [keyTimes addobject:[NSNumber numberWithfloat:duration]];       // duration = duration - 0.1;        offset = - offset ;    }    [values addobject:to];    [keyTimes addobject:[NSNumber numberWithfloat:0.6]];}

解决方法 这是一个很好的链接,其中包含一些如何使用它的示例：

(看了一会儿之后我发现了这个：http://www.cocoanetics.com/2012/06/lets-bounce/我觉得它反d得更好,但更高级.所以不要把代码放在这里)

http://www.touchwonders.com/some-techniques-for-bouncing-animations-in-ios/

CAKeyframeAnimation的示例如下:(取自链接)

-(voID)animateGreenBall{    NSValue * from = [NSNumber numberWithfloat:greenBall.layer.position.y];    CGfloat bouncedistance = 20.0;    CGfloat direction = (greenUp? 1 : -1);    NSValue * via = [NSNumber numberWithfloat:(greenUp ? HEIGHT_DOWN : HEIGHT_UP) + direction*bouncedistance];    NSValue * to = greenUp ? [NSNumber numberWithfloat:HEIGHT_DOWN] : [NSNumber numberWithfloat:HEIGHT_UP];    Nsstring * keypath = @"position.y";    [greenBall.layer addAnimation:[self keyframeBounceAnimationFrom:from via:via to:to forKeypath:keypath withDuration:.6] forKey:@"bounce"];    [greenBall.layer setValue:to forKeyPath:keypath];    greenUp = !greenUp;}-(CAKeyframeAnimation *)keyframeBounceAnimationFrom:(NSValue *)from                                                 via:(NSValue *)via                                                  to:(NSValue *)to                                          forKeypath:(Nsstring *)keyPath                                        withDuration:(CFTimeInterval)duration{    CAKeyframeAnimation * animation = [CAKeyframeAnimation animationWithKeyPath:keyPath];    [animation setValues:[NSArray arrayWithObjects:from,via,to,nil]];    [animation setKeyTimes:[NSArray arrayWithObjects:[NSNumber numberWithfloat:0.0],[NSNumber numberWithfloat:.7],[NSNumber numberWithfloat:1.0],nil]];    animation.duration = duration;    return animation;}

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