[英]iOS UITextField Underline Style in swift
我已经添加了这张图片,希望你能看到它,一个用户界面登录。 请注意,除了底部的行之外,文本字段是透明的。 我应该输入什么代码来获得这种影响? 我可以将必要的信息放在“用户定义的运行时属性”中吗?
创建一个UITextField
的子类,如下所示,只需将故事板中的此类设置为UITextField
Swift 5 支持@IBInspectable
import UIKit
class HSUnderLineTextField: UITextField , UITextFieldDelegate {
let border = CALayer()
@IBInspectable open var lineColor : UIColor = UIColor.black {
didSet{
border.borderColor = lineColor.cgColor
}
}
@IBInspectable open var selectedLineColor : UIColor = UIColor.black {
didSet{
}
}
@IBInspectable open var lineHeight : CGFloat = CGFloat(1.0) {
didSet{
border.frame = CGRect(x: 0, y: self.frame.size.height - lineHeight, width: self.frame.size.width, height: self.frame.size.height)
}
}
required init?(coder aDecoder: (NSCoder?)) {
super.init(coder: aDecoder!)
self.delegate=self;
border.borderColor = lineColor.cgColor
self.attributedPlaceholder = NSAttributedString(string: self.placeholder ?? "",
attributes: [NSAttributedString.Key.foregroundColor: UIColor.white])
border.frame = CGRect(x: 0, y: self.frame.size.height - lineHeight, width: self.frame.size.width, height: self.frame.size.height)
border.borderWidth = lineHeight
self.layer.addSublayer(border)
self.layer.masksToBounds = true
}
override func draw(_ rect: CGRect) {
border.frame = CGRect(x: 0, y: self.frame.size.height - lineHeight, width: self.frame.size.width, height: self.frame.size.height)
}
override func awakeFromNib() {
super.awakeFromNib()
border.frame = CGRect(x: 0, y: self.frame.size.height - lineHeight, width: self.frame.size.width, height: self.frame.size.height)
self.delegate = self
}
func textFieldDidBeginEditing(_ textField: UITextField) {
border.borderColor = selectedLineColor.cgColor
}
func textFieldDidEndEditing(_ textField: UITextField) {
border.borderColor = lineColor.cgColor
}
}
从情节lineColor
设置lineColor
和selectedLineColor
并运行您的项目。
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