如何创建一个指针/传递参数以在Swift中运行

Question

I am struggling to find the answer for this simply because I am unsure what to search for.

In objective-C I would do something like this to get a pointer to an object of a specific class:

CustomLabelClass *detailLabel = (CustomLabelClass *)[sortCell.contentView viewWithTag:kSortDetailLabelTag];  

I would like to do the same in Swift. Basically I detect collision in Sprite Kit Scene and then try and pass the Node (which I know is of a specific class to another function).

    if ((contact.bodyA.node?.isKindOfClass(TapCircleIcon)) != nil) {
        updateOnScreenStatusFor(...)

I need to pass the TapCircleIcon into the function replacing '...'. So in Obj-c I would do something like:

TapCircleIcon *tapCircle = (TapCircleIcon *)[contact.bodyA.node];

Answer 1

You no longer need isKindOfClass in Swift. I am assuming that node is an AnyObject? optional. You can cast it to TapCircleIcon and unwrap the optional using this if statement.

if let tapCircleIcon = contact.bodyA.node as? TapCircleIcon {
    updateOnScreenStatusFor(tapCircleIcon)
} else {
    // node is not a TapCircleIcon
}