Swift 扩展 Storyboard 属性

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可以在 Storyboard 中直接设置 UI 控件的基本样式。

import UIKit//@IBDesignableextension UIView {    @IBInspectable var cornerRadius:CGFloat {        set{            self.layer.cornerRadius = newValue            self.layer.masksToBounds = true        }        get{            return self.layer.cornerRadius        }    }    @IBInspectable var borderWidth:CGFloat {        set{            self.layer.borderWidth = newValue        }        get{            return self.layer.borderWidth        }    }    @IBInspectable var boderColor:UIColor {        set{            self.layer.borderColor = newValue.CGColor        }        get{            return UIColor(CGColor: self.layer.borderColor!)        }    }    @IBInspectable var shadowColor:UIColor{        set{            self.layer.shadowColor = newValue.CGColor        }        get{             return UIColor(CGColor: self.layer.shadowColor!)        }    }    @IBInspectable var shadowOffset:CGSize{        set{            self.layer.shadowOffset = newValue        }        get{            return self.layer.shadowOffset        }    }    @IBInspectable var shadowOpacity:Float{        set{            self.layer.shadowOpacity = newValue        }        get{            return self.layer.shadowOpacity        }    }}

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