how to access UIView without using tag method

Question

I have my own custom view and adding them dynamically to the UIViewController.

Those views are something like:

class pinView: UIView {


    var userID : String?
    var lastTimeConnected : Date?


    init(userID: String, lastTimeConnected : Date)
    {
        self.userID = userID
self.lastTimeConnected = lastTimeConnected

    }

I then add my view to the UIViewController by calling

 imageView.addSubview(pinViewInstance) in a loop

I have events that will trigger my views to move on the screen. I call a database to get their new position and then I need to update them. How do I get to the view by using the userID on my custom view? I would use tags but they are just INT and I need something much bigger than that. Otherwise I need to map the tags to the userIDs which I really want to avoid.

To be clear... I know I can do this: let pinViewInstance = self.view.viewWithTag(numberHere) as? pinView But what I want is to access it by the ID, the first reason why I extended the UIView class in the first place.

I hope you know how to solve this has been stuck on it for a bit and cannot see a way around it. Your help much appreciated. Thanks!

hasan · Accepted Answer · 2017-03-08 00:20:03Z

4

Two options:

One: iterate with a for-loop through the UIImageView.subviews that those custom-views had been added to. set each view to a pinView reference and compare the userID in it.

func getPinView(userId: String) -> (pinView?) {
    for view in self.imageView.subviews as [UIView] {
        if let pin = view as? pinView {
            if pin.userID == userId {
                return pin
           }
        }
    }
    return nil
}

Two: when you add the pinView add them to a dictionary with the userId as key. And when you need the pinView. get it with the key:

// init
var pinViews: [String: pinView] = [:]

// after adding subview
pinViews[pinViewInstance.userID] = pinViewInstance

// get pinView
let pin: pinView = pinViews[userID] as! pinView

edited Mar 8, 2017 at 0:20

answered Mar 8, 2017 at 0:07

hasan

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1 Comment

user2091936 Over a year ago

This works like a charm. Really good solution, elegant and definitely beats using tag. Exactly what I needed.

The Mach System · Accepted Answer · 2017-03-08 00:06:19Z

1

You can iterate through imageView.subviews and find the pinView by using this class type check:

if type(of: aSubview) == pinView.self

Then you can access the userID and check for the right userID.

answered Mar 8, 2017 at 0:06

The Mach System

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