在已加载子视图（UIView）的UIViewController中单击按钮

Question

I'm trying to add a UIView subview into a UIViewController, and that UIView has a UISwitch that I want the user to be able to toggle. Based on the state, a UITextField's value will toggle back and forth. Here is the subview (InitialView):

import UIKit

class InitialView: UIView {

// All UI elements.
var yourZipCodeSwitch: UISwitch = UISwitch(frame: CGRectMake(UIScreen.mainScreen().bounds.width/2 + 90, UIScreen.mainScreen().bounds.height/2-115, 0, 0))

override func didMoveToSuperview() {
    self.backgroundColor = UIColor.whiteColor()

    yourZipCodeSwitch.setOn(true, animated: true)
    yourZipCodeSwitch.addTarget(ViewController(), action: "yourZipCodeSwitchPressed:", forControlEvents: UIControlEvents.TouchUpInside)
    self.addSubview(yourZipCodeSwitch)
}

}

If I want to have it's target properly pointing at the below function, where should I either set the target or include this function? I tried:

• Setting the target in the UIViewController instead of the UIView
• Keeping the function in the UIView

Here's the function:

// Enable/disable "Current Location" feature for Your Location.
func yourZipCodeSwitchPressed(sender: AnyObject) {
    if yourZipCodeSwitch.on
    {
        yourTemp = yourZipCode.text
        yourZipCode.text = "Current Location"
        yourZipCode.enabled = false
    }
    else
    {
        yourZipCode.text = yourTemp
        yourZipCode.enabled = true
    }
}

And here is where I'm loading it into the UIViewController:

// add initial view
var initView : InitialView = InitialView()

// Execute on view load
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    view.addSubview(initView)        
}

Any help is much appreciated - thanks!

Answer 1

Yeah, the didMoveToSuperView() placement doesn't make much sense. So you're creating a random, totally unconnected ViewController instance to make the compiler happy but your project sad. Control code goes in controllers, view code goes in views.

You need in your real ViewController :

override func viewDidLoad() {
    super.viewDidLoad()
    view.addSubview(initView)
    // Note 'self' is the UIViewController here, so we got the scoping right
    initView.yourZipCodeSwitch.addTarget(self, action: "yourZipCodeSwitchPressed:", forControlEvents: .ValueChanged)        
}

Also, .TouchUpInside is for UIButton s. Toggle switches are much more complicated, so their events are different. Touching up inside on a toggle switch's current setting can and should do nothing, whereas touchup inside on the opposite setting triggers the control event above. iOS does all the internal hit detection for you.