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(10, 40, 280, 240)];
 [textView setBackgroundColor:[UIColor greenColor]];
 [textView setFont:[UIFont fontWithName:@"MyriadPro-Regular" size:13]];
 [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 时取消响应resignFirstResponder，可以这样

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