textview弹出的键盘，按return回收键盘

代理方法

#pragma mark UITextViewDelegate

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

{

    if ([@"\n" isEqualToString:text] == YES)

    {

        [textView resignFirstResponder];

        return NO;

    }

    return YES;

}