iOS UISeachBar键盘消失 虚拟按钮

    UIToolbar * topView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 30)];

    [topView setBarStyle:UIBarStyleBlackTranslucent];

    

    UIBarButtonItem * btnSpace = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];

    

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

    btn.frame = CGRectMake(2, 5, 50, 25);

    [btn addTarget:self action:@selector(dismissKeyBoard) forControlEvents:UIControlEventTouchUpInside];

    [btn setImage:[UIImage imageNamed:@"shouqi"] forState:UIControlStateNormal];

    UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc]initWithCustomView:btn];

    NSArray * buttonsArray = [NSArray arrayWithObjects:btnSpace,doneBtn,nil];

    [topView setItems:buttonsArray];

    [_seachbar setInputAccessoryView:topView];

-(void)dismissKeyBoard

{

    [_seachbar resignFirstResponder];

}