想知道每次在文本字段编辑iOS期间按下键盘上的后退按钮时 [英] want to know ever time while pressing on keyboard back button during textfield editing ios

问题描述

在OTP中，使用了四个文本字段.在按住键盘后退按钮的同时将光标移至上一个文本字段?

In OTP, there are four textfields were used. Moving the cursor to the previous textfield while pressing on keyboard back button?

推荐答案

创建UITextField的子类.然后覆盖deleteBackward方法.最后，通过确认BackSpaceDelegate协议，使自定义delegate来检测目标类中的退格键.这里给你一个演示:

Make a subclass of UITextField. Then override the deleteBackward method. At last make custom delegate to detect backspace in your target class by confirming the BackSpaceDelegate protocol. Here give you a demo:

protocol BackSpaceDelegate {
    func deleteBackWord(textField: CustomTextField)
}

class CustomTextField: UITextField {
    var backSpaceDelegate: BackSpaceDelegate?
    override func deleteBackward() {
        super.deleteBackward()
        // called when textfield is empty. you can customize yourself.
        if text?.isEmpty ?? false {
             backSpaceDelegate?.deleteBackWord(textField: self)
        }
    }
}
class YourViewController: UIViewController, BackSpaceDelegate {

    func deleteBackWord(textField: CustomTextField) {
        /// do your stuff here. That means resign or become first responder your expected textfield.
    }
}

希望这会对您有所帮助.

Hope this will help you.

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