文本的编程更改未调用UITextView UITextViewTextDidChangeNotification [英] UITextView UITextViewTextDidChangeNotification not being called on programmatic change of the text

问题描述

我在自定义UITextView的初始化中称呼它:

I call this in the init of a custom UITextView:

[[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(textChanged:)
                                                 name:UITextViewTextDidChangeNotification
                                               object:self];

以编程方式设置textView.text = @""

关于我在做什么错的任何想法吗?

Any Ideas on what I am doing wrong?

推荐答案

您不应将self传递给最后一个参数，该参数是notificationSender，这意味着您只想观察self发送的通知

Your shouldn't pass self to the last parameter, this parameter is notificationSender, it means that you just want to observer the notifications sent by self.

观察者是这样的

[[NSNotificationCenter defaultCenter] addObserver:self
                                      selector:@selector(textChanged:)
                                      name:UITextViewTextDidChangeNotification
                                      object:nil];

希望它可以提供帮助.

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