Ios 使用自定义样式在Swift中创建UITextField扩展

我在视图上有几个UITextField，它们必须看起来相同。我想我可能会创建一个扩展，它将预先设置我的文本字段的样式，我希望这些字段具有相同的样式

let passTextField: UITextField = {
    let tf = UITextField()
    //tf.backgroundColor = UIColor.blueColor()
    tf.translatesAutoresizingMaskIntoConstraints = false
    tf.layer.cornerRadius = 25
    tf.layer.borderColor = UIColor(r: 34, g: 140, b: 204, a: 1).CGColor
    tf.layer.borderWidth = 2.0
    tf.layer.masksToBounds = true
    /* Paddings */
    tf.leftView = UIView(frame: CGRectMake(0, 0, 25, 0))
    tf.leftViewMode = UITextFieldViewMode.Always
    tf.rightView = UIView(frame: CGRectMake(0, 0, 25, 0))
    tf.rightViewMode = UITextFieldViewMode.Always
    /* Place Holder Formating */
    let attributes = [
        NSForegroundColorAttributeName: UIColor(r: 34, g: 140, b: 204, a: 1),
        NSFontAttributeName : UIFont(name: "HelveticaNeue-Thin", size: 16)! // Note the !
    ]
    tf.attributedPlaceholder = NSAttributedString(string: "Email", attributes:attributes)


    return tf
}()

因此，这些属性中的大多数应该包含在扩展中，我希望在声明变量时能够向扩展中添加两个属性

你能帮我吗？我一直在寻找如何创建一个扩展，但似乎没有任何结果

谢谢大家!

您可以使用扩展定义来实现，如果方法是新的，您可以使用下面的代码，如果已经存在，则创建一个覆盖方法

您可以使用扩展定义来执行此操作，如果方法是新的，您可以使用下面的代码，如果已经存在，则创建一个覆盖方法

像这样创建UITextField的扩展

extension UITextField {
    class func attributedTextField(frame: CGRect) -> UITextField {
        let textField = UITextField(frame: frame)
        textField.translatesAutoresizingMaskIntoConstraints = false
        textField.layer.cornerRadius = 25
        textField.layer.borderColor = UIColor(r: 34, g: 140, b: 204, a: 1).CGColor
        textField.layer.borderWidth = 2.0
        textField.layer.masksToBounds = true
        /* Paddings */
        textField.leftView = UIView(frame: CGRectMake(0, 0, 25, 0))
        textField.leftViewMode = UITextFieldViewMode.Always
        textField.rightView = UIView(frame: CGRectMake(0, 0, 25, 0))
        textField.rightViewMode = UITextFieldViewMode.Always
        /* Place Holder Formating */
        textField attributes = [
                          NSForegroundColorAttributeName: UIColor(r: 34, g: 140, b: 204, a: 1),
                          NSFontAttributeName : UIFont(name: "HelveticaNeue-Thin", size: 16)! // Note the !
                          ]
        textField.attributedPlaceholder = NSAttributedString(string: "Email", attributes:attributes)
        return textField
    } 
}

let tf = UITextField.attributedTextField(frame: CGRect(x: 0, y: 0, width: 100, height: 100))

像这样调用这个函数

extension UITextField {
    class func attributedTextField(frame: CGRect) -> UITextField {
        let textField = UITextField(frame: frame)
        textField.translatesAutoresizingMaskIntoConstraints = false
        textField.layer.cornerRadius = 25
        textField.layer.borderColor = UIColor(r: 34, g: 140, b: 204, a: 1).CGColor
        textField.layer.borderWidth = 2.0
        textField.layer.masksToBounds = true
        /* Paddings */
        textField.leftView = UIView(frame: CGRectMake(0, 0, 25, 0))
        textField.leftViewMode = UITextFieldViewMode.Always
        textField.rightView = UIView(frame: CGRectMake(0, 0, 25, 0))
        textField.rightViewMode = UITextFieldViewMode.Always
        /* Place Holder Formating */
        textField attributes = [
                          NSForegroundColorAttributeName: UIColor(r: 34, g: 140, b: 204, a: 1),
                          NSFontAttributeName : UIFont(name: "HelveticaNeue-Thin", size: 16)! // Note the !
                          ]
        textField.attributedPlaceholder = NSAttributedString(string: "Email", attributes:attributes)
        return textField
    } 
}

let tf = UITextField.attributedTextField(frame: CGRect(x: 0, y: 0, width: 100, height: 100))

像这样创建UITextField的扩展

extension UITextField {
    class func attributedTextField(frame: CGRect) -> UITextField {
        let textField = UITextField(frame: frame)
        textField.translatesAutoresizingMaskIntoConstraints = false
        textField.layer.cornerRadius = 25
        textField.layer.borderColor = UIColor(r: 34, g: 140, b: 204, a: 1).CGColor
        textField.layer.borderWidth = 2.0
        textField.layer.masksToBounds = true
        /* Paddings */
        textField.leftView = UIView(frame: CGRectMake(0, 0, 25, 0))
        textField.leftViewMode = UITextFieldViewMode.Always
        textField.rightView = UIView(frame: CGRectMake(0, 0, 25, 0))
        textField.rightViewMode = UITextFieldViewMode.Always
        /* Place Holder Formating */
        textField attributes = [
                          NSForegroundColorAttributeName: UIColor(r: 34, g: 140, b: 204, a: 1),
                          NSFontAttributeName : UIFont(name: "HelveticaNeue-Thin", size: 16)! // Note the !
                          ]
        textField.attributedPlaceholder = NSAttributedString(string: "Email", attributes:attributes)
        return textField
    } 
}

let tf = UITextField.attributedTextField(frame: CGRect(x: 0, y: 0, width: 100, height: 100))

像这样调用这个函数

extension UITextField {
    class func attributedTextField(frame: CGRect) -> UITextField {
        let textField = UITextField(frame: frame)
        textField.translatesAutoresizingMaskIntoConstraints = false
        textField.layer.cornerRadius = 25
        textField.layer.borderColor = UIColor(r: 34, g: 140, b: 204, a: 1).CGColor
        textField.layer.borderWidth = 2.0
        textField.layer.masksToBounds = true
        /* Paddings */
        textField.leftView = UIView(frame: CGRectMake(0, 0, 25, 0))
        textField.leftViewMode = UITextFieldViewMode.Always
        textField.rightView = UIView(frame: CGRectMake(0, 0, 25, 0))
        textField.rightViewMode = UITextFieldViewMode.Always
        /* Place Holder Formating */
        textField attributes = [
                          NSForegroundColorAttributeName: UIColor(r: 34, g: 140, b: 204, a: 1),
                          NSFontAttributeName : UIFont(name: "HelveticaNeue-Thin", size: 16)! // Note the !
                          ]
        textField.attributedPlaceholder = NSAttributedString(string: "Email", attributes:attributes)
        return textField
    } 
}

let tf = UITextField.attributedTextField(frame: CGRect(x: 0, y: 0, width: 100, height: 100))

Swift 4：在UITextField@IBOutlet上使用UITextField扩展

Swift 4：在UITextField@IBOutlet上使用UITextField扩展

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为什么不在扩展中声明方法而不是属性？你可以传递参数。@Crazyrems听起来不错，你能举个例子吗？这基本上是他的答案。您应该在框架中添加更多参数，以便根据需要自定义字段。为什么不在扩展中声明方法而不是属性？你可以传递参数。@Crazyrems听起来不错，你能举个例子吗？这基本上是他的答案。您应该在框架中添加更多参数，以根据需要自定义字段。这是我尝试使用它时出现的错误：在类型“UITextField”上使用实例成员“下划线”；您是否打算改为使用“UITextField”类型的值？这是我尝试使用它时出现的错误：在“UITextField”类型上使用实例成员“下划线”；您的意思是使用类型为“UITextField”的值吗？框架是什么：传递到attributedTextField的yourFrame变量？在textField框架中，请检查我编辑的答案，您会有更好的想法。这是您建议传递的自定义变量吗？我认为这是必需的。什么是框架：传递到attributedTextField的yourFrame变量？在textField框架中，检查我编辑的答案，您会得到更好的想法。这是您建议传递的自定义变量吗？我认为这是必须的。