Question

我想创建一个包含几个关键帧的动画。我想要我的图层（在这种情况下是一个按钮）扩大到1.5然后下降到0.5然后上升到1.2然后下降到0.8然后是1.0。

我也想要每个关键帧的EaseIn和EaseOut。

你可以想象，这会在现场产生一个弹跳/弹跳效果。

在我的应用程序的其他部分，我一直在使用CAKeyframeAnimation（见下面的代码）。这会产生类似的弹性动画，但是对于x和y位置。

我可以调整以下代码来影响比例而不是位置吗？

提前谢谢！

- (CAAnimation*)monInAnimation {
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path,NULL,113,320);
CGPathAddLineToPoint(path, NULL, 113.5, 283);
CGPathAddLineToPoint(path, NULL, 113.5, 179);
CGPathAddLineToPoint(path, NULL, 113.5, 207);  
CGPathAddLineToPoint(path, NULL, 113.5, 187);
CGPathAddLineToPoint(path, NULL, 113.5, 199);
CGPathAddLineToPoint(path, NULL, 113.5, 193);
CGPathAddLineToPoint(path, NULL, 113.5, 195);
CGPathAddLineToPoint(path, NULL, 113.5, 194);

CAKeyframeAnimation *
animation = [CAKeyframeAnimation 
             animationWithKeyPath:@"position"];

[animation setPath:path];
[animation setDuration:1.5];
[animation setCalculationMode:kCAAnimationLinear];
NSArray *arr = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0], 
 [NSNumber numberWithFloat:0.12], 
 [NSNumber numberWithFloat:0.24], 
 [NSNumber numberWithFloat:0.36], 
 [NSNumber numberWithFloat:0.48],
 [NSNumber numberWithFloat:0.60],
 [NSNumber numberWithFloat:0.72],
 [NSNumber numberWithFloat:0.84],
 [NSNumber numberWithFloat:1.0],nil];

 [animation setKeyTimes:arr];
 [animation setTimingFunctions:[NSArray arrayWithObjects:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                                [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut], nil]];
 //[animation setAutoreverses:YES];
CFRelease(path);
return animation;

}

- (void)monBtnIn {

[monButton.layer setPosition:CGPointMake(113.5,194)];
[monButton.layer addAnimation:[self monInAnimation] 
                    forKey:@"position"];

}

Answer 1

为您提供两种替代解决方案：

首先，您还可以为转换属性设置动画。

使用Brad的代码，但使用@“transform”作为密钥路径。主要优点是您不必计算实际帧，而是提供简单的缩放因子：

<强>目标C ：

CAKeyframeAnimation *boundsOvershootAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];

CATransform3D startingScale = CATransform3DScale (layer.transform, 0, 0, 0);
CATransform3D overshootScale = CATransform3DScale (layer.transform, 1.2, 1.2, 1.0);
CATransform3D undershootScale = CATransform3DScale (layer.transform, 0.9, 0.9, 1.0);
CATransform3D endingScale = layer.transform; 

NSArray *boundsValues = [NSArray arrayWithObjects:[NSValue valueWithCATransform3D:startingScale],
                                                  [NSValue valueWithCATransform3D:overshootScale],
                                                  [NSValue valueWithCATransform3D:undershootScale],
                                                  [NSValue valueWithCATransform3D:endingScale], nil];
[boundsOvershootAnimation setValues:boundsValues];

NSArray *times = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0f],
                  [NSNumber numberWithFloat:0.5f],
                  [NSNumber numberWithFloat:0.9f],
                  [NSNumber numberWithFloat:1.0f], nil];    
[boundsOvershootAnimation setKeyTimes:times];


NSArray *timingFunctions = [NSArray arrayWithObjects:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut], 
                            [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                            [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                            nil];
[boundsOvershootAnimation setTimingFunctions:timingFunctions];
boundsOvershootAnimation.fillMode = kCAFillModeForwards;
boundsOvershootAnimation.removedOnCompletion = NO;

Swift 4 ：

let boundsOvershootAnimation = CAKeyframeAnimation(keyPath: "transform")

let startingScale = CATransform3DScale(layer.transform, 0, 0, 0)
let overshootScale = CATransform3DScale(layer.transform, 1.2, 1.2, 1.0)
let undershootScale = CATransform3DScale(layer.transform, 0.9, 0.9, 1.0)
let endingScale = layer.transform

boundsOvershootAnimation.values = [startingScale, overshootScale, undershootScale, endingScale]

boundsOvershootAnimation.keyTimes = [0.0, 0.5, 0.9, 1.0].map { NSNumber(value: $0) }

boundsOvershootAnimation.timingFunctions = [
    CAMediaTimingFunction(name:kCAMediaTimingFunctionEaseOut),
    CAMediaTimingFunction(name:kCAMediaTimingFunctionEaseInEaseOut),
    CAMediaTimingFunction(name:kCAMediaTimingFunctionEaseInEaseOut)
]

boundsOvershootAnimation.fillMode = kCAFillModeForwards
boundsOvershootAnimation.isRemovedOnCompletion = false

其次，可能更容易，使用FTUtils，一个用于核心动画的开源包装器。它包括一个股票“弹性”动画。

你可以在： http://github.com/neror/ftutils

Answer 2

transform.scale，有人吗？

let anim = CAKeyframeAnimation(keyPath: "transform.scale")
anim.values = [0, 1, 0, 1, 0, 1, 0]
anim.duration = 4.0

smallView.layer.addAnimation(anim, forKey: "what")

完全无关，如果要在值数组中使用浮点数，则必须将它们添加为NSNumbers，否则它们最终会以0结尾！

anim.values = [0.0, 1.2, 0.9, 1.0].map { NSNumber(double: $0) }

Answer 3

您需要自己设置关键帧，而不是设置CAKeyframeAnimation的路径。我之前通过设置图层边界大小的动画来创建“弹出”效果：

CAKeyframeAnimation *boundsOvershootAnimation = [CAKeyframeAnimation animationWithKeyPath:@"bounds.size"];
CGSize startingSize = CGSizeZero;
CGSize overshootSize = CGSizeMake(targetSize.width * (1.0f + POPINOVERSHOOTPERCENTAGE), targetSize.height * (1.0f + POPINOVERSHOOTPERCENTAGE));
CGSize undershootSize = CGSizeMake(targetSize.width * (1.0f - POPINOVERSHOOTPERCENTAGE), targetSize.height * (1.0f - POPINOVERSHOOTPERCENTAGE));
NSArray *boundsValues = [NSArray arrayWithObjects:[NSValue valueWithCGSize:startingSize],
                         [NSValue valueWithCGSize:overshootSize],
                         [NSValue valueWithCGSize:undershootSize],
                         [NSValue valueWithCGSize:targetSize], nil];
[boundsOvershootAnimation setValues:boundsValues];

NSArray *times = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.0f],
                  [NSNumber numberWithFloat:0.5f],
                  [NSNumber numberWithFloat:0.9f],
                  [NSNumber numberWithFloat:1.0f], nil];    
[boundsOvershootAnimation setKeyTimes:times];


NSArray *timingFunctions = [NSArray arrayWithObjects:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut], 
                            [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                            [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],
                            nil];
[boundsOvershootAnimation setTimingFunctions:timingFunctions];
boundsOvershootAnimation.fillMode = kCAFillModeForwards;
boundsOvershootAnimation.removedOnCompletion = NO;

其中，POPINOVERSHOOTPERCENTAGE是我想要超出图层目标尺寸的部分。

Answer 4

我不知道你是否可以使用CAKeyframeAnimation来动画UIView的比例，但你可以使用CABasicAnimation并设置fromValue和toValue属性，并使用它来为transform属性设置动画：

- (CAAnimation*)monInAnimation 
{
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
    animation.fromValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)];
    animation.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(3.0, 3.0, 3.0)];
    [animation setDuration:1.5];
    [animation setAutoreverses:YES];
    return animation;
}

- (IBAction)monBtnIn 
{
    [monButton.layer addAnimation:[self monInAnimation] forKey:@"transform"];
}

你如何CAKeyframeAnimation规模？

4 个答案: