iOS按钮事件传參的二种方式

var buttonPars:[Int:IndexPath] = [:];

cell.actionButton.addTarget(self, action: #selector(actionButtonClick(button:)), for: UIControlEvents.touchUpInside)
let tagNum = indexPath.section*1000000 + indexPath.row;
cell.actionButton.tag = tagNum;
self.buttonPars[tagNum] = indexPath;

@objc func actionButtonClick(button:UIButton){
    print("button.tag:\(button.tag)");
    if let indexPath = self.buttonPars[button.tag]{
        print("section:\(indexPath.section)");
        print("row:\(indexPath.row)");
    }
}

class SonghuoViewController: UIViewController{
	//定义静态变量
	static var action = "action";

	func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
	   let  cell = tableView.dequeueReusableCellWithIdentifier("songhuoCell", forIndexPath: indexPath) as! SonghuoTableViewCell;
	   cell.actionButton.addTarget(self, action: #selector(actionButtonClick(button:)), forControlEvents: UIControlEvents.TouchUpInside);
	   
	   //创建关联
	   objc_setAssociatedObject(cell.actionButton, &SonghuoViewController.action, indexPath, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC);
	   return cell;
	}
	
	@objc func actionButtonClick(button:UIButton){
		//获取关联的对象
	   if let indexPath = objc_getAssociatedObject(button, &SonghuoViewController.action) as? NSIndexPath{
	   	  print("section:\(indexPath.section)");
	   	  print("row:\(indexPath.row)");
	   }	   
	}
}

objc_setAssociatedObject(cell.actionButton, &SonghuoViewController.action, indexPath, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC);

objc_getAssociatedObject(button, &SonghuoViewController.action)

objc_setAssociatedObject(cell.actionButton, &SonghuoViewController.action, nil, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC);