不用interface　builder　怎样将事件跟按钮关联起来？
就是用代码新建一个按钮，然后与一个IBAction事件关联起来

运行可以看到按钮，点击按钮会执行一个事件函数　

具体如何做的，书本没教，都是ib连接的


[解决办法]

midButton= [[UIButton alloc] initWithFrame:CGRectMake(349, 387,90,90)];
[midButton setImage:[UIImage imageNamed:@"arge.png"] forState:UIControlStateNormal];
[midButton addTarget:self action:@selector(showImage) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:midButton];
midButton.tag = 8;
[midButton autorelease];
-------------------------------
-(void)showImage{

}