如何将目标添加到键盘“完成”/“转到”/“搜索”按钮?

要处理返回键,请使用delegate textFieldShouldReturn

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
         // your Action According to your textfield
        return true
    }

如何更改返回键

yourTextField.returnKeyType = UIReturnKeyType.search
yourTextField.returnKeyType = UIReturnKeyType.done

Apple枚举:

typedef NS_ENUM(NSInteger, UIReturnKeyType) {
    UIReturnKeyDefault,
    UIReturnKeyGo,
    UIReturnKeyGoogle,
    UIReturnKeyJoin,
    UIReturnKeyNext,
    UIReturnKeyRoute,
    UIReturnKeySearch,
    UIReturnKeySend,
    UIReturnKeyYahoo,
    UIReturnKeyDone,
    UIReturnKeyEmergencyCall,
    UIReturnKeyContinue NS_ENUM_AVAILABLE_IOS(9_0),
}

实施 UITextFieldDelegate 方法 textFieldShouldReturn 获取那个按钮点击事件,不管按钮的名称。

class YourViewController: UIViewController, UITextFieldDelegate {
    //conform protocol of `UITextFieldDelegate` in any of `viewDidLoad` or `viewWillAppear` method
    self.textFieldYouWantToHandle.delegate = self;

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        if textField == textFieldYouWantToHandle {
           //any task to perform
           textField.resignFirstResponder() //if you want to dismiss your keyboard
        }
        return true
    }
}