[Swift]UIView缩放动画

拓展：

extension UIView {   

    public func setScale(x: CGFloat, y: CGFloat) {
        var transform = CATransform3DIdentity
        transform.m34 = 1.0 / -1000.0
        transform = CATransform3DScale(transform, x, y, 1)
        self.layer.transform = transform
    }
  
}

使用：

// 底部弹窗
botFloatView?.setScale(x: 0, y: 0)
botFloatView?.isHidden = false
UIView.animate(withDuration: 0.4) { [weak self] in
    self?.botFloatView?.setScale(x: 1, y: 1)
} completion: { _ in
    DispatchQueue.main.asyncAfter(deadline: .now() + TimeInterval(2)) { [weak self] in
        UIView.animate(withDuration: 0.4) { [weak self] in
            self?.botFloatView?.setScale(x: 0.1, y: 0.1)
        } completion: { [weak self] _ in
            self?.botFloatView?.isHidden = true
        }
    }
}

示意：