Swift可重用的UITextFieldDelegate [英] Swift reusable UITextFieldDelegate

问题描述

我正在尝试实现可重复使用的 UITextFieldDelegate 类，如下所示：

I am trying to implement a reusable UITextFieldDelegate class as follows:

class CustomTextFieldDelegate : NSObject, UITextFieldDelegate

所有委托协议方法均已正确实现。

All delegate protocol methods are implemented correctly.

在控制器中，将 delegate 分配给 UITextField

textField.delegate = CustomTextFieldDelegate()

问题是没有调用任何委托函数。但是，当我从控制器实现委托协议时，一切正常

The problem is that none of the delegate functions get called. However, when I implement the delegate protocol from the controller, then things work fine

class CustomTableViewController: UITableViewController, UITextFieldDelegate

有什么想法吗？

推荐答案

如果要在整个项目中重用CustomTextFieldDelegate，则应使用Singleton实例；

If your want to reuse CustomTextFieldDelegate through out the project, you should use a Singleton instance;

textField.delegate = CustomTextFieldDelegate.sharedInstance

和类更改

class CustomTextFieldDelegate : NSObject, UITextFieldDelegate {

    static let sharedInstance:CustomTextFieldDelegate = CustomTextFieldDelegate();

    func textFieldDidBeginEditing(textField: UITextField) {
        NSLog("textFieldDidBeginEditing ...");
    }
   //... other methods
} //F.E.

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