UIImageView上添加Button不能响应点击事件[转]

    UIImageView *backImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height-UITABBAR_HEIGHT-216-39, 320, 43) ];
    [backImageView setUserInteractionEnabled:YES];//使添加其上的button有点击事件
    [backImageView setImage:[UIImage imageNamed:@"navigationBar.png"]];
    [backScroll addSubview:backImageView];
    
    UIButton *loginButton = [UIButton alloc];
    [loginButton setFrame:CGRectMake(10, 0, 40, 43)];
    [loginButton setTitle:@"hello" forState:UIControlStateNormal];
    [loginButton addTarget:self action:@selector(loginOrLogout) forControlEvents:UIControlEventTouchUpInside];
    [backImageView addSubview:loginButton

以上代码是在一张图片上面添加按钮，并让按钮在图片上面能够响应按钮的事件的做法。