在iOS上以编程方式向按钮添加操作

Question

我正在尝试向我以编程方式创建的按钮添加操作:

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

这很好用.但是,我现在想要将一个变量(int k)传递给indexAction方法.我无法让这个工作:

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

我确信我做错了什么.这是上面代码的上下文:

  -(void) initIndexButtons {

    float buttonPadding = -8;
    float buttonWidth = 23;
    float buttonHeight = 80;
    CGRect frame = CGRectMake(0,0,0,0);
    for (int k=0;k<5;k++)
    {
        UIButton* btn = [[UIButton alloc] initWithFrame:frame];;        btn.tag = k;
        btn.frame = CGRectMake(0, k*(buttonPadding+buttonHeight), buttonWidth, buttonHeight);

        UIImage *newImage = [UIImage imageNamed:@"index.png"];
        [btn setBackgroundImage:newImage forState:UIControlStateNormal];

        [btn    addTarget:self
                action:@selector(self indexAction:k)
         forControlEvents:UIControlEventTouchUpInside];
    }
}

-(void)indexAction:(int *)buttonTag
{
    NSLog(@"buttonTag: %i", buttonTag);
}

---

编辑:

我将代码更改为:

// ...
[btn    addTarget:self
                action:@selector(indexAction:)
         forControlEvents:UIControlEventTouchUpInside];

        //[self indexAction:k];

        [indexView addSubview:btn];
        [indexView sendSubviewToBack:btn];
    }
}

-(void)indexAction:(id)sender
{
    NSInteger *tid = ((UIControl *) sender).tag;
    NSLog(@"buttonTag: %i", tid);
}

但是现在我收到一条警告信息:"初始化从整数开始生成指针而没有为该行强制转换 NSInteger *tid = ((UIControl *) sender).tag;

---

编辑:

这是正确的代码行:

NSInteger tid = ((UIControl*)sender).tag;

Answer 1

通常，按钮调用的方法采用一个参数：

(id)sender

看一下问题 -如何将变量传递给 UIButton 操作