你如何CAKeyframeAnimation规模？ [英] How Do You CAKeyframeAnimation Scale?

问题描述

我想创建一个包含几个关键帧的动画。我希望我的Layer（在这种情况下是一个按钮）
可以扩展到1.5然后降低到0.5然后降到1.2然后降低到0.8然后是1.0。

I want to create an animation with several key frames. I want my Layer (a button in this case) to scale up to 1.5 then down to 0.5 then up to 1.2 then down to 0.8 then 1.0.

我还想要每个关键帧的EaseIn和EaseOut。

I also want to EaseIn and EaseOut of each keyframe.

你可以想象，这将在现场产生一个Springy / Bounce效果。

As you can imagine, this will create a Springy/Bounce effect on the spot.

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）。
这会创建一个类似的弹性动画，但是对于x和y位置。

In other parts of my app I have been using CAKeyframeAnimation like this (see below code). This creates a similar springy animation but for x and y position.

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"];

}

推荐答案

两种替代解决方案：

首先，您还可以为转换属性设置动画。

First, You can also animate the transform property.

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

Using Brad's code, but using @"transform" for the keypath. The primary advantage being that you do not have to calculate the actual frame, but instead provide a simple scaling factor:

Objective-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，一个核心的开源包装器动画。它包括一个股票弹性动画。

Second, and likely easier, is using FTUtils, an open source wrapper for core animation. It includes a stock "springy" animation.

你可以得到它：
http://github.com/neror/ftutils

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