如何检测UIKeyboard“退格”按钮触摸UITextField？ [英] How to detect UIKeyboard "backspace" button touch on UITextField?

问题描述

如何检测 UIKeyboard 上按下的退格按钮？

How can i detect backspace button pressed on UIKeyboard?

谢谢

编辑：是否有任何键盘委托返回按键值？

EDIT: Is there any keyboard delegate that returns key pressed value?

推荐答案

如果UITextField为空，则不会调用shouldChangeTextInRange委托方法
您可以继承UITextField并覆盖此方法：

if the UITextField is empty, the shouldChangeTextInRange delegate method is not called You can subclass UITextField and override this method:

-(void)deleteBackward;
{
    [super deleteBackward];
    NSLog(@"BackSpace Detected");
}

因为UITextField符合UITextInput协议，所以实现了这个方法，而你可以覆盖它以检测何时按下退格键。
然后，如果检测到退格，您可以编写自己的协议/委托方法来提醒自定义文本字段委托。

since UITextField is compliant to the UITextInput protocol, this method is implemented, and you can override it to detect when backspace is pressed. Then, you can write your own protocol/delegate method to alert your custom textfield delegate if the backspace is detected.

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