如何使用返回键关闭 UITextView 的键盘？

In IB's library, the introduction tells us that when the return key is pressed, the keyboard for UITextView will disappear. But actually the return key can only act as '\n'.

我可以添加一个按钮并使用[txtView resignFirstResponder]隐藏键盘。

But is there a way to add the action for the return key in keyboard so that I needn't add UIButton?

我想我应该把代码片段贴在这里：

确保您声明支持UITextViewDelegate协议。

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {

    if([text isEqualToString:@"\n"]) {
        [textView resignFirstResponder];
        return NO;
    }

    return YES;
}

斯威夫特4.0更新：

func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
    if text == "\n" {
        textView.resignFirstResponder()
        return false
    }
    return true
}