点击系统键盘的语音按钮，导致输入工具栏被遮挡

技术指南 iOS
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在聊天页面的 viewDidLoad 监听键盘通知

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(rcInputBar_didReceiveKeyboardWillShowNotification:)
                                             name:UIKeyboardWillShowNotification
                                           object:nil];
- (void)rcInputBar_didReceiveKeyboardWillShowNotification:(NSNotification *)notification {
    [self.chatSessionInputBarControl.inputTextView becomeFirstResponder];
}