在swift中正确地对UITextField进行子类化

所以我有这些文本字段，我意识到它们都具有相同的属性，所以我创建了一个名为“ UserInputs ”的新类并从UITextField扩展，一切正常，除了一件事， UITextFieldDelegate函数不起作用，我的意思是当我专注于它们它不起作用，我想在代码中添加它，因为当你专注于我的输入字段他们改变边框时，我如何从UITextField正确子类

我唯一的问题是function：

 textFieldDidBeginEditing textFieldDidEndEditing 

所以不起作用。

这是我的class级 ，一切都在发生：

 import Foundation import UIKit class RegistrationViewController: UIViewController, UITextFieldDelegate { @IBOutlet weak var firstName: UserInputs! @IBOutlet weak var test: UserInputs! override func viewDidLoad() { super.viewDidLoad() self.firstName.delegate = self self.test.delegate = self } } 

这是我的子类 ：

 class UserInputs: UITextField{ required init(coder aDecoder: NSCoder) { super.init(coder: aDecoder)! createBorder() } func createBorder(){ let border = CALayer() let width = CGFloat(2.0) border.borderColor = UIColor(red: 55/255, green: 78/255, blue: 95/255, alpha: 1.0).CGColor border.frame = CGRect(x: 0, y: self.frame.size.height-width, width: self.frame.size.width, height: self.frame.size.height) border.borderWidth = width self.layer.addSublayer(border) self.layer.masksToBounds = true //print("border created") } func textFieldDidBeginEditing() { print("focused") self.pulseBorderColor() } func textFieldDidEndEditing() { print("lost focus") self.reversePulseBorderColor() } func pulseBorderColor(){ let pulseAnimation = CABasicAnimation(keyPath: "borderColor") pulseAnimation.duration = 0.35 pulseAnimation.fromValue = UIColor(red: 55/255, green: 78/255, blue: 95/255, alpha: 1.0).CGColor pulseAnimation.toValue = UIColor(red: 252/255, green: 180/255, blue: 29/255, alpha: 1.0).CGColor pulseAnimation.fillMode = kCAFillModeForwards pulseAnimation.removedOnCompletion = false pulseAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut) self.layer.sublayers![0].addAnimation(pulseAnimation,forKey: nil) } func reversePulseBorderColor(){ let pulseAnimation = CABasicAnimation(keyPath: "borderColor") pulseAnimation.duration = 0.35 pulseAnimation.fromValue = UIColor(red: 252/255, green: 180/255, blue: 29/255, alpha: 1.0).CGColor pulseAnimation.toValue = UIColor(red: 55/255, green: 78/255, blue: 95/255, alpha: 1.0).CGColor pulseAnimation.fillMode = kCAFillModeForwards pulseAnimation.removedOnCompletion = false pulseAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut) self.layer.sublayers![0].addAnimation(pulseAnimation,forKey: nil) } } 

这个代码工作时，我没有子类，并在我的主类中进行，但在创建子类焦点函数停止工作后，其他一切工作

主要问题是我想实施

 func textFieldDidBeginEditing() { print("focused") } func textFieldDidEndEditing() { print("lost focus") } 

这些在我的文本区域中所以我不会一遍又一遍地写它

Answer 1

看起来你的代码中的UITextFieldDelegate函数有点偏差。 他们应该是：

 func textFieldDidBeginEditing(textField: UITextField) { print("focused") } func textFieldDidEndEditing(textField: UITextField) { print("lost focus") } 

既然你想让UserInputs对象成为他们自己的代表，我也添加了那些代码。 为了certificate这一点，我有以下两个文件：

ViewController.swift

 import UIKit class ViewController: UIViewController, UITextFieldDelegate { var textField: UserInputs! override func viewDidLoad() { super.viewDidLoad() textField = UserInputs(frame: CGRectMake(100, 100, 200, 40)) view.addSubview(textField!) } } 

UserInputs.swift

 import UIKit class UserInputs: UITextField, UITextFieldDelegate { required init(coder aDecoder: NSCoder) { super.init(coder: aDecoder)! delegate = self createBorder() } required override init(frame: CGRect) { super.init(frame: frame) delegate = self createBorder() } func createBorder(){ let border = CALayer() let width = CGFloat(2.0) border.borderColor = UIColor(red: 55/255, green: 78/255, blue: 95/255, alpha: 1.0).CGColor border.frame = CGRect(x: 0, y: self.frame.size.height-width, width: self.frame.size.width, height: self.frame.size.height) border.borderWidth = width self.layer.addSublayer(border) self.layer.masksToBounds = true //print("border created") } func textFieldDidBeginEditing(textField: UITextField) { print("focused") } func textFieldDidEndEditing(textField: UITextField) { print("lost focus") } } 

Answer 2

您的UITextFieldDelegate应该保留在RegistrationViewController中。

您可以执行此操作，而不是覆盖委托。 在init方法中，使用适当的函数将目标添加到self。

 class UserInputs: UITextField { override init(frame: CGRect) { super.init(frame: frame) self.addTarget(self, action: "formatText", for: .editingChanged) } required init?(coder aDecoder: NSCoder) { super.init(coder: aDecoder) self.addTarget(self, action: "formatText", for: .editingChanged) } func formatText() { // Edit self.text here } //.......// } 

Answer 3

您可以通过在UserInput中调用委托来更改边框

 class UserInputs: UITextField, UITextFieldDelegate{ let border = CALayer() required init(coder aDecoder: NSCoder) { super.init(coder: aDecoder)! createBorder() self.delegate = self } func createBorder(){ let width = CGFloat(2.0) border.borderColor = UIColor(red: 55/255, green: 78/255, blue: 95/255, alpha: 1.0).CGColor border.frame = CGRect(x: 0, y: self.frame.size.height-width, width: self.frame.size.width, height: self.frame.size.height) border.borderWidth = width self.layer.addSublayer(border) self.layer.masksToBounds = true //print("border created") } func pulseBorderColor(){ border.borderColor = UIColor.greenColor().CGColor } func normalColor(){ border.borderColor = UIColor(red: 55/255, green: 78/255, blue: 95/255, alpha: 1.0).CGColor } func textFieldDidBeginEditing(textField: UITextField) { print("focused") pulseBorderColor() } func textFieldDidEndEditing(textField: UITextField) { print("lost focus") normalColor() } }