UITextView textViewShouldEndEditing

最近做到UITextView, 在取消键盘事件上我以为和UITextField差不多，于是我这样写：

  UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(, , , )];
  [textView setBackgroundColor:[UIColor greenColor]];
  [textView setFont:[UIFont fontWithName:@"MyriadPro-Regular" size:]];
  [textView setTextColor:[UIColor blackColor]];
  [textView setText:@"Your Message...."];
  [textView setBackgroundColor:[UIColor clearColor]];
  [textView setDelegate:self];
  [textView setReturnKeyType:UIReturnKeyDone];

    我以为，当按下键盘上的“完成”按钮后，将被调用

 - (BOOL)textViewShouldEndEditing:(UITextView *)textView {
  NSLog(@"called");
  [textView resignFirstResponder];
  return YES;
 }

然而我忘记了textView有换行的事件，即

点击Return，它只是在textview里换行。所以，如果你想捕捉到换行\n时取消响应resignFirstResponder，可以这样

 - (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
  if ( [text isEqualToString:@"\n"] ) {
   [textView resignFirstResponder];
  }
  return YES;
 }