以可视格式语言设置动画指标

Question

您能用Visual Format语言制作指标吗？我尝试过以下内容：

// ViewDidLoad
    self.padding = 100
    self.metrics = [:]
    self.metrics?["padding"] = 100

// And then in some method
UIView.animate(withDuration: 0.5, animations: {
            self.metrics?["padding"] = 100
            self.view.layoutIfNeeded()
    })