ios 缩放动画

    CABasicAnimation *buttonAni = [CABasicAnimation animationWithKeyPath:@"transform.scale"];

    //self.startButton.layer.transform = CATransform3DMakeScale(1.5, 1.5, 1);

    buttonAni.fromValue = @1.0;

    buttonAni.toValue = @1.5;

    buttonAni.duration = 0.1;

    buttonAni.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];

    [self.startButton.layer addAnimation:buttonAni forKey:@"buttonAnimation"];