textView 退回键盘

textview.returnKeyType = UIReturnKeyDone;

#pragma mark - UITextView Delegate Methods

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

{

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

            [textView resignFirstResponder];

            return NO;

        }

        return YES;

}