iphone - "unrecognized selector sent to instance"出现键盘时
<p><p>当我在我的应用程序屏幕中单击文本字段并且键盘显示时，xcode 调试器显示此错误:</p>
<pre><code>: unrecognized selector sent to instance 0x5867ac0
</code></pre>
<p>在 mainViewController 的 viewDidLoad 方法中，我像这样调用 registerForKeyboardNotifications 方法:</p>
<p><strong>;</strong></p>
<p>这是它的实现(在 mainViewController.m 中):</p>
<pre><code>- (void)registerForKeyboardNotifications
{
[ addObserver:self selector:@selector(keyboardWasShown:) name:UIKeyboardDidShowNotification object:nil];
[ addObserver:self selector:@selector(keyboardWillBeHidden:) name:UIKeyboardWillHideNotification object:nil];
}
// Called when the UIKeyboardDidShowNotification is sent.
- (void)keyboardWasShown:(NSNotification*)aNotification
{
}
// Called when the UIKeyboardWillHideNotification is sent
- (void)keyboardWillBeHidden:(NSNotification*)aNotification
{
}
</code></pre>
<p>知道可能出了什么问题吗？</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>确保通知选择器末尾有冒号；这很重要，<code>keyboardWasShown</code> 和 <code>keyboardWasShown:</code> 是不同的选择器。</p></p>
<p style="font-size: 20px;">关于iphone - "unrecognized selector sent to instance"出现键盘时，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/7542827/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/7542827/
</a>
</p>
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