ios 键盘上显示收回键盘button

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:@"收起键盘" style:UIBarButtonItemStyleDone target:self action:@selector(dismissKeyBoard)];


NSArray * buttonsArray = [NSArray arrayWithObjects:btnSpace,doneButton,nil];
[doneButton release];
[btnSpace release];
//[helloButton release];

[topView setItems:buttonsArray];
[iReply setInputAccessoryView:topView];



-(void)dismissKeyBoard
{
[iReply resignFirstResponder];

}