IOS 开发UITextView回收或关闭键盘

- (void)textViewDidBeginEditing:(UITextView *)textView { 
  UIBarButtonItem *done =  [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(leaveEditMode)] autorelease]; 
  self.navigationItem.rightBarButtonItem = done;   
} 
 
- (void)textViewDidEndEditing:(UITextView *)textView { 
  self.navigationItem.rightBarButtonItem = nil; 
} 
 
- (void)leaveEditMode { 
  [self.textView resignFirstResponder]; 
} 

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text 
{ 
  if ([text isEqualToString:@"\n"]) { 
    [textView resignFirstResponder]; 
    return NO; 
  } 
  return YES; 
} 

UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)]; 
  [topView setBarStyle:UIBarStyleBlack]; 
   
  UIBarButtonItem * helloButton = [[UIBarButtonItem alloc]initWithTitle:@"Hello" style:UIBarButtonItemStyleBordered target:self action:nil]; 
   
  UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil]; 
   
  UIBarButtonItem * doneButton = [[UIBarButtonItem alloc]initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)]; 
   
  NSArray * buttonsArray = [NSArray arrayWithObjects:helloButton,btnSpace,doneButton,nil]; 
  [doneButton release]; 
  [btnSpace release]; 
  [helloButton release]; 
   
  [topView setItems:buttonsArray]; 
  [tvTextView setInputAccessoryView:topView]; 
 
-(IBAction)dismissKeyBoard 
{ 
  [tvTextView resignFirstResponder]; 
}