Swift-UITextView占位文字及占位文字颜色扩展(可在xib中直接使用)

概述使用案例 extension UITextView { private struct RuntimeKey { static let hw_placeholderLabelKey = UnsafeRawPointer.init(bitPattern: "hw_placeholderLabelKey".hashValue) /// ...其他Key声明

使用案例

extension UITextVIEw {    private struct RuntimeKey {        static let hw_placeholderLabelKey = UnsafeRawPointer.init(bitPattern: "hw_placeholderLabelKey".hashValue)        /// ...其他Key声明    }    /// 占位文字    @IBInspectable public var placeholder: String {        get {            return self.placeholderLabel.text ?? ""        }        set {            self.placeholderLabel.text = newValue        }    }    /// 占位文字颜色    @IBInspectable public var placeholdercolor: UIcolor {        get {            return self.placeholderLabel.textcolor        }        set {            self.placeholderLabel.textcolor = newValue        }    }    private var placeholderLabel: UILabel {        get {            var label = objc_getAssociatedobject(self,UITextVIEw.RuntimeKey.hw_placeholderLabelKey!) as? UILabel            if label == nil {                if (self.Font == nil) {                    self.Font = UIFont.systemFont(ofSize: 14)                }                label = UILabel.init(frame: self.bounds)                label?.numberOflines = 0                label?.Font = self.Font                label?.textcolor = UIcolor.lightGray                self.addSubvIEw(label!)                self.setValue(label!,forKey: "_placeholderLabel")                objc_setAssociatedobject(self,UITextVIEw.RuntimeKey.hw_placeholderLabelKey!,label!,.OBJC_ASSOCIATION_RETAIN_NONATOMIC)                self.sendSubvIEw(toBack: label!)            }            return label!        }        set {            objc_setAssociatedobject(self,newValue,.OBJC_ASSOCIATION_RETAIN_NONATOMIC)        }    }}

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