关于点击关闭按钮隐藏subView 的问题

iPhone应用中，添加subView到窗口，还要实现一个功能，在点击关闭按钮是，应该subView隐藏起来，这是创建subView的代码：

 UIView*subView=[[UIView alloc]initWithFrame:CGRectMake(0,0, 1024,768)];
 subView.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"bgPopupback.png"]];
 UIWindow* window = [UIApplication sharedApplication].keyWindow;
 if (!window) 
    window = [[UIApplication sharedApplication].windows objectAtIndex:0];
 [[[window subviews] objectAtIndex:0] addSubview:subView];  
``

关闭按钮：

-(void)closeButtonAction{
NSLog(@"CLicked on this button");
[subView removeFromSuperview] ;
self.tableView.userInteractionEnabled=TRUE;

}