UITextField扩展

//  UITextField扩展

import UIKit
extension UITextField {
    /// UITextField占位文字修改
    ///
    /// - Parameters:
    ///   - placeHolderStr: 占位文字
    ///   - withFont: 文本大小
    ///   - withColor: 文本颜色
    func placeHolderChange(_ placeHolderStr : String,_ withFont : UIFont,_ withColor : UIColor) {
        let attributes = [
            NSAttributedStringKey.foregroundColor: withColor,
            NSAttributedStringKey.font : withFont // Note the !
            ] as [NSAttributedStringKey : Any]
        
        attributedPlaceholder = NSAttributedString(string: placeHolderStr, attributes:attributes)
    }
}