UIImageView的cornerRadius不工作

Question

我将cornerRadius设置如下：

@IBDesignable class CornerImageView: UIImageView {
@IBInspectable var cornerRadiusValue: CGFloat = 10.0 {
    didSet {
        setUpView()
    }
}
override func awakeFromNib() {
    super.awakeFromNib()
    setUpView()
}
override func prepareForInterfaceBuilder() {
    super.prepareForInterfaceBuilder()
    setUpView()
}

func setUpView() {
    self.layer.cornerRadius = self.cornerRadiusValue == -1 ? self.bounds.size.height/2 : self.cornerRadiusValue
    self.clipsToBounds = true
}
}

在故事板上，它工作正常。但在设备上运行时失败。请帮帮我！

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