CODEWITHSUNDEEP
iosswift
JeremyRaven
JeremyRaven

Reputation: 119

How to update one UISwitch when using another UISwitch

Case: I have 2 UISwitches - Switch1 and Switch2. Switch1 controls the visbility of a UILabel in my scene. Switch2 once activated turns Switch1 off as well as its visbility.

Problem: After Switch2 is activated Switch1 turns off as well as disappears however my UILabel is still visible in my scene.

switch1.addTarget(self, action: #selector(switch1Action), for: UIControl.Event.valueChanged)
switch2.addTarget(self, action: #selector(switch2Action), for: UIControl.Event.valueChanged)


    @objc func switch1Action(switch1: UISwitch) {
        if switch1.isOn {

            lockedMessage.isHidden = false
            }
        if !switch1.isOn {

            lockedMessage.isHidden = true
        }
    }

    @objc func switch2Action(switch2: UISwitch) {

        if switch2.isOn {

            switch1.isOn = false
            switch1.isHidden = true

        }

Many thanks! :)

Upvotes: 0

Views: 64

Answers (3)

Mojtaba Hosseini
Mojtaba Hosseini

Reputation: 119128

This is correct and desired behavior. Since you explicitly changed the value, it is up to you to decide how to handle the changed value.

The reason for this is because it is not uncommon to explicitly change the value of control after being notified of its value being changed through user interaction. If the explicit state change caused the event to fire again, you would end up in an infinite loop. "@rmaddy"

Deprecated (since the original question updated):

You (probably accidentally) set a unrelated condition for hiding the label. (What is moveWall ?).

Try this instead:

@objc func switch1Action(switch1: UISwitch) {
    lockedMessage.isHidden = !switch1.isOn
    ,,,
}

Upvotes: 1

leedex
leedex

Reputation: 1013

If I understand your issue correctly, then it seems you want lockedMessage to be hidden if switch2 is on as well. If this is the case – you can change the visibility of the lockedMessage within your function switch2Action.

@objc func switch2Action(switch2: UISwitch) {

    if switch2.isOn {
        switch1.isOn = false
        switch1.isHidden = true
        lockedMessage.isHidden = true
    }

Upvotes: 1

Zmaster
Zmaster

Reputation: 1135

Setting switch1.isOn programmatically will not trigger the switch1Action. You need to hide the message label from switch2Action.

For reference see the documentation:

Setting the switch to either position does not result in an action message being sent.

Upvotes: 0

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