响应按钮的事件

怎样响应按钮的事件：

  imageView.userInteractionEnabled = YES; //允许图片的点击事件

如何处理点击：

    UIButton *btn;
    btn = [UIButton buttonWithType:UIButtonTypeCustom];    //button风格
    btn.tag = 111;    //按钮标签
    btn.titleLabel.font = [UIFont systemFontOfSize: 14];
    [btn setTitle:@"精装美图" forState:UIControlStateNormal]; 
    [btn setFrame:CGRectMake(128, 1, 70, 25)];    //大小及位置
    [btn addTarget:self action:@selector(btnPressed:) forControlEvents:UIControlEventTouchUpInside];     //设置事件
    [self.view addSubview:btn];

//按钮响应事件
-(void) btnPressed:(id) sender
{
    UIButton *myBtn=(UIButton *) sender;
    if (myBtn.tag == 111)
    {
        PageControl *firstPageView = [[[PageControl alloc] init] autorelease];	//PageControl是一个定制的UIViewController
        [self.navigationController pushViewController:firstPageView animated:NO];  //跳转，关闭跳转动画
    }
    
    
    if (myBtn.tag == 302)
    {
        
        SecondViewThirdSubViewController *secondView = [[[SecondViewThirdSubViewController alloc] init] autorelease];
        [self.navigationController pushViewController:secondView animated:YES];        
    }
    
}