swift - 为什么当我使用 CASSpringAnimation 时我的图像没有动画？

Question

我希望我的图像在被点击时具有动画效果，这是我目前的代码，当我点击图像时由于某种原因没有任何反应。

lazy var profileImageView: UIImageView = {
    let imageView = UIImageView()
    imageView.image = UIImage(named: "made")
    imageView.translatesAutoresizingMaskIntoConstraints = false
    imageView.contentMode = .scaleAspectFill
    imageView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(taptap)))
    imageView.isUserInteractionEnabled = true
    return imageView
}()

@objc func taptap() {
    let pulse = CASpringAnimation(keyPath: "transform.scale")
    pulse.duration = 0.6
    pulse.fromValue = 0.95
    pulse.toValue = 1.0
    pulse.autoreverses = true
    pulse.repeatCount = 2
    pulse.initialVelocity = 0.5
    pulse.damping = 1.0
    layer.add(pulse, forKey: nil)
}

Answer 1

除了向 ImageView 行添加动画外，一切看起来都很好。替换这一行:

layer.add(pulse, forKey: nil)

与:

profileImageView.layer.add(pulse, forKey: nil)

您需要将 Core Animations 添加到 View 的 layer，这里是您的 profileImageView。