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你能用视觉格式语言为指标制作动画吗?我尝试过类似以下的方法:

// 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()
    })
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