继承UILabel，子类代码如下：
public class ScaleLabel: UILabel {
public override class var layerClass: AnyClass {
return CATiledLayer.classForCoder()
}
public override init(frame: CGRect) {
super.init(frame: frame)
if let _layer = self.layer as? CATiledLayer {
_layer.levelsOfDetail = 10
_layer.levelsOfDetailBias = 10
}
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
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