Iphone 如何在Core Plot中设置条形图外观的动画？

当第一次使用Core Plot显示条形图时，我希望条形图向上生长，直到达到正确的高度

您将如何使用此框架创建这样的动画？

这非常类似于：

这就是我所做的：

在viewDidLoad控制器的方法中，我创建了CPTXYGraph：

graph = [[CPTXYGraph alloc] initWithFrame:self.view.bounds];

我将动画添加到空图形中：

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

然后在animationDidStop委托的方法中，我将绘图数据和动画添加到图形中：

CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform.scale.y"];
[anim setDuration:2.0f];

anim.toValue = [NSNumber numberWithFloat:1.0f];
anim.fromValue = [NSNumber numberWithFloat:0.0f];
anim.removedOnCompletion = NO;
anim.delegate = self;
anim.fillMode = kCAFillModeForwards;

gPlot.anchorPoint = CGPointMake(0.0, 0.0);

[gPlot addAnimation:anim forKey:@"grow"];

[graph addPlot:gPlot ];// IMPORTANT here I added the plot data to the graph :) .

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为您的CPTBarPlot添加动画，如下所示：

CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform"];
[animation setDuration:1];
CATransform3D transform = CATransform3DMakeScale(1, 0.0001, 1);
// offsetY=[PlotDisplayAreaUnderXAxisHeight]-[PlotDisplayAreaHeight]/2
transform = CATransform3DConcat(transform, CATransform3DMakeTranslation(0, offsetY, 0));
animation.fromValue = [NSValue valueWithCATransform3D:transform];
animation.toValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];
[barPlot addAnimation:animation forKey:@"barGrowth"];

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谢谢Michele的精彩回答

我已经从她的答案上传了一个示例到Github，供那些想下载演示并立即开始工作的人使用

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享受编码

像这样添加不透明度动画

CABasicAnimation *fadeInAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
fadeInAnimation.duration = 1.0f;
fadeInAnimation.removedOnCompletion = NO;
fadeInAnimation.fillMode = kCAFillModeForwards;
fadeInAnimation.toValue = [NSNumber numberWithFloat:1.0];
[xSquaredPlot addAnimation:fadeInAnimation forKey:@"animateOpacity"];