键盘可见时，将输入附件视图添加到UITextField [英] Adding input accessory view to UITextField while keyboard is visible

问题描述

我想将输入附件视图添加到 UITextField ，而它是第一个响应者，即显示键盘。显然，在此状态下将 UIView 分配给 inputAccessoryView 属性不会显示此视图。我必须首先关闭键盘并重新选择 UITextField 。

I would like to add an input accessory view to a UITextField while it is the first responder, i.e. showing the keyboard. Apparently, assigning a UIView to the inputAccessoryView property in this state doesn't display this view. I have to first dismiss the keyboard and re-select the UITextField.

有没有办法添加输入附件视图没有解雇和重新选择？

Is there a way to add an input accessory view without dismissing and re-selecting?

推荐答案

如果可能的话只分配 inputAccessoryView 一次。如果您需要进行自定义，并且只能确定在成为第一个响应者之前已经很晚，那么我仍然只会分配一次。但是在 UITextFieldDelegate 方法中自定义 inputAccessoryView 的子视图 textFieldShouldBeginEditing：。像这样：

If possible only assign the inputAccessoryView once. If you need it to be customized, and can only determine how very late just before becoming the first responder, then I would still only assign it once. But customize the subviews of the inputAccessoryView in the UITextFieldDelegate method textFieldShouldBeginEditing:. Like so:

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    [self setupInputAccessoryViewForTextField:textField];
    return YES;
}

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