如何知道UITextView何时成为第一响应者 [英] How to know when UITextView became first responder

问题描述

当uitextview成为第一响应者时如何处理。我在文本视图中有文本，我想在视图变为活动时想要清除文本。我怎样才能做到这一点？由于事先

How to handle when uitextview became first responder. I have text in text view and I want when the view became active want to clear the text. How can I do that? Thanks in advance

推荐答案

您绝对可以使用的 UITextViewDelegate 方法：

You can definitely use a UITextViewDelegate method of:

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView

只需返回YES并拦截该方法。你也可以做到这一点对 UITextFields 与 UITextFieldDelegate 和

Just return YES and intercept inside that method. You can also do it for UITextFields with UITextFieldDelegate and:

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField

希望有所帮助。

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