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Bad_Instruction

 
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func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell!  {
        var cell : UITableViewCell = tableView.dequeueReusableCellWithIdentifier("Component") as UITableViewCell

        if (cell == nil) {
            cell = UITableViewCell(style: UITableViewCellStyle.Value1, reuseIdentifier: "Component")
        }

        cell.textLabel.text = "Baking Soda"
        cell.detailTextLabel.text = "1/2 cup"

        return cell
    }

修改为
var cell : UITableViewCell?

//variable type is inferred
var cell = tableView.dequeueReusableCellWithIdentifier("CELL") as? UITableViewCell

if !cell {
    cell = UITableViewCell(style: UITableViewCellStyle.Value1, reuseIdentifier: "CELL")
}

//we know that cell is not empty now so we use ! to force unwrapping

cell!.textLabel.text = "Baking Soda"
cell!.detailTextLabel.text = "1/2 cup"

cell!.textLabel.text = "Hello World"

return cell

 

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