iphone - 如何获取许多 UIButtons 的标签但具有相同的 Action 选择器

Question

我有一个方法可以显示 10 个(或更多)UIButton。我这里有一个关于如何显示这些按钮的代码..

-(void)showButtons{
for(int i = 0; i < 10; i++){
  UIButton *button = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
  button.frame = CGRectMake(x, y, 100, 94);  //Assume x and y have values
  **button.tag = i + 1000;**
  [button setBackgroundImage:[_cardImages objectAtIndex:i]  
      forState:UIControlStateNormal];
  [button addTarget:self action:@selector(myMethod:)   
      forControlEvents:UIControlEventTouchUpInside];
  [self.view add subview:button];
  [button release];

}

-(IBAction)myMethod:(id)sender{
// I would like to print here button.tag, but I always get an error

Answer 1

您需要在此处对发件人进行类型转换，因为 id 类型没有 tag 属性。
新代码将是

-(IBAction)myMethod:(id)sender{
   UIButton *pressedButton = (UIButton *)sender;
   NSLog(@"Tag of button pressed:%d",pressedButton.tag);
}